untabified

18 files changed, 289 insertions, 289 deletions

diff --git a/docs/teaching/exercises/tests/Test.java b/docs/teaching/exercises/tests/Test.java
index e4f5b60f9..17d8b12e6 100644
--- a/docs/teaching/exercises/tests/Test.java
+++ b/docs/teaching/exercises/tests/Test.java
@@ -1,13 +1,13 @@
 /* *******************************************************************
  * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
- * All rights reserved. 
- * This program and the accompanying materials are made available 
- * under the terms of the Common Public License v1.0 
- * which accompanies this distribution and is available at 
- * http://www.eclipse.org/legal/cpl-v10.html 
- *  
- * Contributors: 
- *     PARC     initial implementation 
+ * All rights reserved.
+ * This program and the accompanying materials are made available
+ * under the terms of the Common Public License v1.0
+ * which accompanies this distribution and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ *     PARC     initial implementation
  * ******************************************************************/
 
 package tests;
@@ -31,12 +31,12 @@ public class Test extends TestCase {
     Group g;
 
     public void setUp() {
-	p1 = new Point(10, 100);
-	p2 = new Point(20, 200);
-	l1 = new Line(p1, p2);
+        p1 = new Point(10, 100);
+        p2 = new Point(20, 200);
+        l1 = new Line(p1, p2);
         bb = new Box(5, 5, 10, 10);
         sloth1 = new SlothfulPoint(0, 0);
-	g = new Group(p1);
+        g = new Group(p1);
     }
 
     public final void testCreate() {
@@ -48,17 +48,17 @@ public class Test extends TestCase {
     }
 
     public final void testSetPoint() {
-	p1.setX(20);
+        p1.setX(20);
         assertEquals(p1.getX(), 20);
         assertEquals(p1.getY(), 100);
 
-	p1.setY(10);
+        p1.setY(10);
         assertEquals(p1.getX(), 20);
         assertEquals(p1.getY(), 10);
     }
 
     public final void testMoveLine1() {
-	l1.move(40, 40);
+        l1.move(40, 40);
         assertEquals(l1.getP1(), p1);
         assertEquals(l1.getP2(), p2);
 
@@ -70,7 +70,7 @@ public class Test extends TestCase {
     }
 
     public final void testMoveLine2() {
-	l1.move(-10, -10);
+        l1.move(-10, -10);
         assertEquals(p1.getX(), 0);
         assertEquals(p1.getY(), 90);
 
diff --git a/docs/teaching/exercises/tests/Test1a.java b/docs/teaching/exercises/tests/Test1a.java
index b8bb2e120..147a899e5 100644
--- a/docs/teaching/exercises/tests/Test1a.java
+++ b/docs/teaching/exercises/tests/Test1a.java
@@ -1,13 +1,13 @@
 /* *******************************************************************
  * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
- * All rights reserved. 
- * This program and the accompanying materials are made available 
- * under the terms of the Common Public License v1.0 
- * which accompanies this distribution and is available at 
- * http://www.eclipse.org/legal/cpl-v10.html 
- *  
- * Contributors: 
- *     PARC     initial implementation 
+ * All rights reserved.
+ * This program and the accompanying materials are made available
+ * under the terms of the Common Public License v1.0
+ * which accompanies this distribution and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ *     PARC     initial implementation
  * ******************************************************************/
 
 package tests;
@@ -34,22 +34,22 @@ public class Test1a extends Test {
     }
 
     public void testSetXPointLog() {
-	p1.setX(20);
+        p1.setX(20);
         assertEquals("set;", Log.getString());
     }
 
     public void testSetYPointLog() {
-	p1.setY(10);
+        p1.setY(10);
         assertEquals("", Log.getString());
     }
 
     public void testGetYPointLog() {
-	p1.getY();
+        p1.getY();
         assertEquals("", Log.getString());
     }
 
     public void testMoveLineLog() {
-	l1.move(40, 40);
+        l1.move(40, 40);
         assertEquals("", Log.getString());
     }
 }
diff --git a/docs/teaching/exercises/tests/Test2a.java b/docs/teaching/exercises/tests/Test2a.java
index 21ce08a9f..0b737020b 100644
--- a/docs/teaching/exercises/tests/Test2a.java
+++ b/docs/teaching/exercises/tests/Test2a.java
@@ -1,13 +1,13 @@
 /* *******************************************************************
  * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
- * All rights reserved. 
- * This program and the accompanying materials are made available 
- * under the terms of the Common Public License v1.0 
- * which accompanies this distribution and is available at 
- * http://www.eclipse.org/legal/cpl-v10.html 
- *  
- * Contributors: 
- *     PARC     initial implementation 
+ * All rights reserved.
+ * This program and the accompanying materials are made available
+ * under the terms of the Common Public License v1.0
+ * which accompanies this distribution and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ *     PARC     initial implementation
  * ******************************************************************/
 
 package tests;
diff --git a/docs/teaching/exercises/tests/Test2b.java b/docs/teaching/exercises/tests/Test2b.java
index 63a10b7b0..e127b5cc4 100644
--- a/docs/teaching/exercises/tests/Test2b.java
+++ b/docs/teaching/exercises/tests/Test2b.java
@@ -1,13 +1,13 @@
 /* *******************************************************************
  * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
- * All rights reserved. 
- * This program and the accompanying materials are made available 
- * under the terms of the Common Public License v1.0 
- * which accompanies this distribution and is available at 
- * http://www.eclipse.org/legal/cpl-v10.html 
- *  
- * Contributors: 
- *     PARC     initial implementation 
+ * All rights reserved.
+ * This program and the accompanying materials are made available
+ * under the terms of the Common Public License v1.0
+ * which accompanies this distribution and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ *     PARC     initial implementation
  * ******************************************************************/
 
 package tests;
@@ -29,7 +29,7 @@ public class Test2b extends Test {
 
     public void testNull() {
         try {
-	    g.add(null);
+            g.add(null);
             fail("should have thrown IllegalArgumentException");
         } catch (IllegalArgumentException ea) {
         }
diff --git a/docs/teaching/exercises/tests/Test2c.java b/docs/teaching/exercises/tests/Test2c.java
index cfcb0d1d8..153739fc0 100644
--- a/docs/teaching/exercises/tests/Test2c.java
+++ b/docs/teaching/exercises/tests/Test2c.java
@@ -1,13 +1,13 @@
 /* *******************************************************************
  * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
- * All rights reserved. 
- * This program and the accompanying materials are made available 
- * under the terms of the Common Public License v1.0 
- * which accompanies this distribution and is available at 
- * http://www.eclipse.org/legal/cpl-v10.html 
- *  
- * Contributors: 
- *     PARC     initial implementation 
+ * All rights reserved.
+ * This program and the accompanying materials are made available
+ * under the terms of the Common Public License v1.0
+ * which accompanies this distribution and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ *     PARC     initial implementation
  * ******************************************************************/
 
 package tests;
@@ -29,7 +29,7 @@ public class Test2c extends Test {
 
     public void testNull() {
         try {
-	    g.add(null);
+            g.add(null);
             fail("should have thrown IllegalArgumentException");
         } catch (IllegalArgumentException ea) {
         }
@@ -37,7 +37,7 @@ public class Test2c extends Test {
 
     public void testSelf() {
         try {
-	    g.add(g);
+            g.add(g);
             fail("should have thrown IllegalArgumentException");
         } catch (IllegalArgumentException ea) {
         }
diff --git a/docs/teaching/exercises/tests/Test2d.java b/docs/teaching/exercises/tests/Test2d.java
index 89e47c088..b8056fbf3 100644
--- a/docs/teaching/exercises/tests/Test2d.java
+++ b/docs/teaching/exercises/tests/Test2d.java
@@ -1,13 +1,13 @@
 /* *******************************************************************
  * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
- * All rights reserved. 
- * This program and the accompanying materials are made available 
- * under the terms of the Common Public License v1.0 
- * which accompanies this distribution and is available at 
- * http://www.eclipse.org/legal/cpl-v10.html 
- *  
- * Contributors: 
- *     PARC     initial implementation 
+ * All rights reserved.
+ * This program and the accompanying materials are made available
+ * under the terms of the Common Public License v1.0
+ * which accompanies this distribution and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ *     PARC     initial implementation
  * ******************************************************************/
 
 package tests;
@@ -29,7 +29,7 @@ public class Test2d extends Test {
 
     public void testSetting() {
         try {
-	    sloth1.setX(10);
+            sloth1.setX(10);
             fail("should have thrown RuntimeException");
         } catch (RuntimeException ea) {
         }
diff --git a/docs/teaching/exercises/tests/Test2e.java b/docs/teaching/exercises/tests/Test2e.java
index 57af08501..dfa456138 100644
--- a/docs/teaching/exercises/tests/Test2e.java
+++ b/docs/teaching/exercises/tests/Test2e.java
@@ -1,13 +1,13 @@
 /* *******************************************************************
  * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
- * All rights reserved. 
- * This program and the accompanying materials are made available 
- * under the terms of the Common Public License v1.0 
- * which accompanies this distribution and is available at 
- * http://www.eclipse.org/legal/cpl-v10.html 
- *  
- * Contributors: 
- *     PARC     initial implementation 
+ * All rights reserved.
+ * This program and the accompanying materials are made available
+ * under the terms of the Common Public License v1.0
+ * which accompanies this distribution and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ *     PARC     initial implementation
  * ******************************************************************/
 
 package tests;
@@ -35,7 +35,7 @@ public class Test2e extends Test {
 
         try {
             sq.getP0().setX(100);
-	    sq.move(37, 1);
+            sq.move(37, 1);
             fail("should have thrown IllegalStateException");
         } catch (IllegalStateException e) { }
     }
diff --git a/docs/teaching/exercises/tests/Test2f.java b/docs/teaching/exercises/tests/Test2f.java
index da63b12e1..a11e16781 100644
--- a/docs/teaching/exercises/tests/Test2f.java
+++ b/docs/teaching/exercises/tests/Test2f.java
@@ -1,13 +1,13 @@
 /* *******************************************************************
  * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
- * All rights reserved. 
- * This program and the accompanying materials are made available 
- * under the terms of the Common Public License v1.0 
- * which accompanies this distribution and is available at 
- * http://www.eclipse.org/legal/cpl-v10.html 
- *  
- * Contributors: 
- *     PARC     initial implementation 
+ * All rights reserved.
+ * This program and the accompanying materials are made available
+ * under the terms of the Common Public License v1.0
+ * which accompanies this distribution and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ *     PARC     initial implementation
  * ******************************************************************/
 
 package tests;
diff --git a/docs/teaching/exercises/tests/Test2g.java b/docs/teaching/exercises/tests/Test2g.java
index 7ed9ba341..f4a7a1949 100644
--- a/docs/teaching/exercises/tests/Test2g.java
+++ b/docs/teaching/exercises/tests/Test2g.java
@@ -1,13 +1,13 @@
 /* *******************************************************************
  * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
- * All rights reserved. 
- * This program and the accompanying materials are made available 
- * under the terms of the Common Public License v1.0 
- * which accompanies this distribution and is available at 
- * http://www.eclipse.org/legal/cpl-v10.html 
- *  
- * Contributors: 
- *     PARC     initial implementation 
+ * All rights reserved.
+ * This program and the accompanying materials are made available
+ * under the terms of the Common Public License v1.0
+ * which accompanies this distribution and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ *     PARC     initial implementation
  * ******************************************************************/
 
 package tests;
diff --git a/docs/teaching/exercises/tests/Test2h.java b/docs/teaching/exercises/tests/Test2h.java
index 9ed695d9b..339322519 100644
--- a/docs/teaching/exercises/tests/Test2h.java
+++ b/docs/teaching/exercises/tests/Test2h.java
@@ -1,13 +1,13 @@
 /* *******************************************************************
  * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
- * All rights reserved. 
- * This program and the accompanying materials are made available 
- * under the terms of the Common Public License v1.0 
- * which accompanies this distribution and is available at 
- * http://www.eclipse.org/legal/cpl-v10.html 
- *  
- * Contributors: 
- *     PARC     initial implementation 
+ * All rights reserved.
+ * This program and the accompanying materials are made available
+ * under the terms of the Common Public License v1.0
+ * which accompanies this distribution and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ *     PARC     initial implementation
  * ******************************************************************/
 
 package tests;
diff --git a/docs/teaching/exercises/tests/Test3a.java b/docs/teaching/exercises/tests/Test3a.java
index 3cb063251..33afa3a82 100644
--- a/docs/teaching/exercises/tests/Test3a.java
+++ b/docs/teaching/exercises/tests/Test3a.java
@@ -1,13 +1,13 @@
 /* *******************************************************************
  * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
- * All rights reserved. 
- * This program and the accompanying materials are made available 
- * under the terms of the Common Public License v1.0 
- * which accompanies this distribution and is available at 
- * http://www.eclipse.org/legal/cpl-v10.html 
- *  
- * Contributors: 
- *     PARC     initial implementation 
+ * All rights reserved.
+ * This program and the accompanying materials are made available
+ * under the terms of the Common Public License v1.0
+ * which accompanies this distribution and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ *     PARC     initial implementation
  * ******************************************************************/
 
 package tests;
@@ -34,7 +34,7 @@ public class Test3a extends Test {
     }
 
     public void testMovePointLog() {
-	p1.move(20, 30);
+        p1.move(20, 30);
         assertEquals("moving;", Log.getString());
     }
 
@@ -43,7 +43,7 @@ public class Test3a extends Test {
     }
 
     public void testGetYPointLog() {
-	p1.getY();
+        p1.getY();
         assertEquals("", Log.getString());
     }
 }
diff --git a/docs/teaching/exercises/tests/Test3b.java b/docs/teaching/exercises/tests/Test3b.java
index 6ec933cee..1e8e8bd4d 100644
--- a/docs/teaching/exercises/tests/Test3b.java
+++ b/docs/teaching/exercises/tests/Test3b.java
@@ -1,13 +1,13 @@
 /* *******************************************************************
  * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
- * All rights reserved. 
- * This program and the accompanying materials are made available 
- * under the terms of the Common Public License v1.0 
- * which accompanies this distribution and is available at 
- * http://www.eclipse.org/legal/cpl-v10.html 
- *  
- * Contributors: 
- *     PARC     initial implementation 
+ * All rights reserved.
+ * This program and the accompanying materials are made available
+ * under the terms of the Common Public License v1.0
+ * which accompanies this distribution and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ *     PARC     initial implementation
  * ******************************************************************/
 
 package tests;
@@ -34,21 +34,21 @@ public class Test3b extends Test {
     }
 
     public void testCreateWithPointLog() {
-	g = new Group(p1);
+        g = new Group(p1);
         assertEquals("adding Point;", Log.getString());
     }
 
     public void testCreateWithoutPointLog() {
-	g = new Group(l1);
+        g = new Group(l1);
         assertEquals("", Log.getString());
     }
 
     public void testAddPointLog() {
-	g.add(p1);
+        g.add(p1);
         assertEquals("adding Point;", Log.getString());
     }
     public void testAddNonPointLog() {
-	g.add(l1);
+        g.add(l1);
         assertEquals("", Log.getString());
     }
 }
diff --git a/docs/teaching/exercises/tests/Test3c.java b/docs/teaching/exercises/tests/Test3c.java
index 6c135e91c..292a0213d 100644
--- a/docs/teaching/exercises/tests/Test3c.java
+++ b/docs/teaching/exercises/tests/Test3c.java
@@ -1,13 +1,13 @@
 /* *******************************************************************
  * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
- * All rights reserved. 
- * This program and the accompanying materials are made available 
- * under the terms of the Common Public License v1.0 
- * which accompanies this distribution and is available at 
- * http://www.eclipse.org/legal/cpl-v10.html 
- *  
- * Contributors: 
- *     PARC     initial implementation 
+ * All rights reserved.
+ * This program and the accompanying materials are made available
+ * under the terms of the Common Public License v1.0
+ * which accompanies this distribution and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ *     PARC     initial implementation
  * ******************************************************************/
 
 package tests;
@@ -34,14 +34,14 @@ public class Test3c extends Test {
     }
 
     public void testMoveLonePoint() {
-	p1 = new Point(0, 0);
-	p1.move(37, 88);
+        p1 = new Point(0, 0);
+        p1.move(37, 88);
         assertEquals("moving as a part of null;", Log.getString());
     }
 
     public void testMoveGroupedPoint() {
-	g = new Group(p1);
-	p1.move(0, 0);
+        g = new Group(p1);
+        p1.move(0, 0);
         assertEquals("moving as a part of " + g + ";", Log.getString());
     }
 }
diff --git a/docs/teaching/exercises/tests/Test4a.java b/docs/teaching/exercises/tests/Test4a.java
index ddb18415a..7e8f0f234 100644
--- a/docs/teaching/exercises/tests/Test4a.java
+++ b/docs/teaching/exercises/tests/Test4a.java
@@ -1,13 +1,13 @@
 /* *******************************************************************
  * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
- * All rights reserved. 
- * This program and the accompanying materials are made available 
- * under the terms of the Common Public License v1.0 
- * which accompanies this distribution and is available at 
- * http://www.eclipse.org/legal/cpl-v10.html 
- *  
- * Contributors: 
- *     PARC     initial implementation 
+ * All rights reserved.
+ * This program and the accompanying materials are made available
+ * under the terms of the Common Public License v1.0
+ * which accompanies this distribution and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ *     PARC     initial implementation
  * ******************************************************************/
 
 package tests;
@@ -19,8 +19,8 @@ import junit.framework.*;
 
 public class Test4a extends Test {
     Rectangle wholeCanvas =
-	new Rectangle(FigureElement.MIN_VALUE, FigureElement.MIN_VALUE,
-		      FigureElement.MAX_VALUE, FigureElement.MAX_VALUE);
+        new Rectangle(FigureElement.MIN_VALUE, FigureElement.MIN_VALUE,
+                      FigureElement.MAX_VALUE, FigureElement.MAX_VALUE);
 
     public Test4a(String name) { super(name); }
 
diff --git a/docs/teaching/exercises/tests/Test4b.java b/docs/teaching/exercises/tests/Test4b.java
index 609289508..31bea5209 100644
--- a/docs/teaching/exercises/tests/Test4b.java
+++ b/docs/teaching/exercises/tests/Test4b.java
@@ -1,13 +1,13 @@
 /* *******************************************************************
  * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
- * All rights reserved. 
- * This program and the accompanying materials are made available 
- * under the terms of the Common Public License v1.0 
- * which accompanies this distribution and is available at 
- * http://www.eclipse.org/legal/cpl-v10.html 
- *  
- * Contributors: 
- *     PARC     initial implementation 
+ * All rights reserved.
+ * This program and the accompanying materials are made available
+ * under the terms of the Common Public License v1.0
+ * which accompanies this distribution and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ *     PARC     initial implementation
  * ******************************************************************/
 
 package tests;
@@ -30,30 +30,30 @@ public class Test4b extends Test {
     }
 
     public void testBasicEquality() {
-	assertTrue(g.getBounds() == g.getBounds());
+        assertTrue(g.getBounds() == g.getBounds());
     }
 
     public void testEqualityAfterAddition() {
-	Point p0 = new Point(1, 2);
-	Point p1 = new Point(2, 3);
-
-	Group g0 = new Group(p0);
-	Group g1 = new Group(p1);
-
-	Rectangle r0 = g0.getBounds();
-	Rectangle r1 = g1.getBounds();
-	assertTrue(r0 != r1);
-	g0.add(new Point(37, 90));
-	assertTrue(g0.getBounds() == r0);
-	assertTrue(g1.getBounds() != r0);
-	assertTrue(g0.getBounds() != r1);
-	assertTrue(g1.getBounds() == r1);
-
-	g1.add(new Point(4, 8));
-	assertTrue(g0.getBounds() == r0);
-	assertTrue(g1.getBounds() != r0);
-	assertTrue(g0.getBounds() != r1);
-	assertTrue(g1.getBounds() == r1);
+        Point p0 = new Point(1, 2);
+        Point p1 = new Point(2, 3);
+
+        Group g0 = new Group(p0);
+        Group g1 = new Group(p1);
+
+        Rectangle r0 = g0.getBounds();
+        Rectangle r1 = g1.getBounds();
+        assertTrue(r0 != r1);
+        g0.add(new Point(37, 90));
+        assertTrue(g0.getBounds() == r0);
+        assertTrue(g1.getBounds() != r0);
+        assertTrue(g0.getBounds() != r1);
+        assertTrue(g1.getBounds() == r1);
+
+        g1.add(new Point(4, 8));
+        assertTrue(g0.getBounds() == r0);
+        assertTrue(g1.getBounds() != r0);
+        assertTrue(g0.getBounds() != r1);
+        assertTrue(g1.getBounds() == r1);
     }
 
     public void testNotWholeCanvas() {
diff --git a/docs/teaching/exercises/tests/Test4c.java b/docs/teaching/exercises/tests/Test4c.java
index b5bf8f708..1f30a9ae3 100644
--- a/docs/teaching/exercises/tests/Test4c.java
+++ b/docs/teaching/exercises/tests/Test4c.java
@@ -1,13 +1,13 @@
 /* *******************************************************************
  * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
- * All rights reserved. 
- * This program and the accompanying materials are made available 
- * under the terms of the Common Public License v1.0 
- * which accompanies this distribution and is available at 
- * http://www.eclipse.org/legal/cpl-v10.html 
- *  
- * Contributors: 
- *     PARC     initial implementation 
+ * All rights reserved.
+ * This program and the accompanying materials are made available
+ * under the terms of the Common Public License v1.0
+ * which accompanies this distribution and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ *     PARC     initial implementation
  * ******************************************************************/
 
 package tests;
@@ -30,54 +30,54 @@ public class Test4c extends Test {
     }
 
     public void testBasicEquality() {
-	assertTrue(g.getBounds() == g.getBounds());
+        assertTrue(g.getBounds() == g.getBounds());
     }
 
     public void testEqualityAfterAddition() {
-	Point p0 = new Point(1, 2);
-	Point p1 = new Point(2, 3);
-
-	Group g0 = new Group(p0);
-	Group g1 = new Group(p1);
-
-	Rectangle r0 = g0.getBounds();
-	Rectangle r1 = g1.getBounds();
-	assertTrue(r0 != r1);
-	g0.add(new Point(37, 90));
-	assertTrue(g0.getBounds() == r0);
-	assertTrue(g1.getBounds() != r0);
-	assertTrue(g0.getBounds() != r1);
-	assertTrue(g1.getBounds() == r1);
-
-	g1.add(new Point(4, 8));
-	assertTrue(g0.getBounds() == r0);
-	assertTrue(g1.getBounds() != r0);
-	assertTrue(g0.getBounds() != r1);
-	assertTrue(g1.getBounds() == r1);
+        Point p0 = new Point(1, 2);
+        Point p1 = new Point(2, 3);
+
+        Group g0 = new Group(p0);
+        Group g1 = new Group(p1);
+
+        Rectangle r0 = g0.getBounds();
+        Rectangle r1 = g1.getBounds();
+        assertTrue(r0 != r1);
+        g0.add(new Point(37, 90));
+        assertTrue(g0.getBounds() == r0);
+        assertTrue(g1.getBounds() != r0);
+        assertTrue(g0.getBounds() != r1);
+        assertTrue(g1.getBounds() == r1);
+
+        g1.add(new Point(4, 8));
+        assertTrue(g0.getBounds() == r0);
+        assertTrue(g1.getBounds() != r0);
+        assertTrue(g0.getBounds() != r1);
+        assertTrue(g1.getBounds() == r1);
     }
 
     public void testEqualityAfterMove() {
-	Point p0 = new Point(1, 2);
-	Point p1 = new Point(2, 3);
-
-	Group g0 = new Group(p0);
-	Group g1 = new Group(p1);
-
-	Rectangle r0 = g0.getBounds();
-	Rectangle r1 = g1.getBounds();
-	assertTrue(r0 != r1);
-	assertTrue(g0.getBounds() == r0);
-	assertTrue(g1.getBounds() != r0);
-	assertTrue(g0.getBounds() != r1);
-	assertTrue(g1.getBounds() == r1);
-
-	g0.move(3, 1);
-	Rectangle r00 = g0.getBounds();
-	Rectangle r10 = g1.getBounds();
-
-	assertTrue(r10 != r00);
-	assertTrue(r0 != r00);
-	assertTrue(g0.getBounds() == r00);
+        Point p0 = new Point(1, 2);
+        Point p1 = new Point(2, 3);
+
+        Group g0 = new Group(p0);
+        Group g1 = new Group(p1);
+
+        Rectangle r0 = g0.getBounds();
+        Rectangle r1 = g1.getBounds();
+        assertTrue(r0 != r1);
+        assertTrue(g0.getBounds() == r0);
+        assertTrue(g1.getBounds() != r0);
+        assertTrue(g0.getBounds() != r1);
+        assertTrue(g1.getBounds() == r1);
+
+        g0.move(3, 1);
+        Rectangle r00 = g0.getBounds();
+        Rectangle r10 = g1.getBounds();
+
+        assertTrue(r10 != r00);
+        assertTrue(r0 != r00);
+        assertTrue(g0.getBounds() == r00);
     }
 }
 
diff --git a/docs/teaching/exercises/tests/Test4d.java b/docs/teaching/exercises/tests/Test4d.java
index e4458c6a4..c1871cfd0 100644
--- a/docs/teaching/exercises/tests/Test4d.java
+++ b/docs/teaching/exercises/tests/Test4d.java
@@ -1,13 +1,13 @@
 /* *******************************************************************
  * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
- * All rights reserved. 
- * This program and the accompanying materials are made available 
- * under the terms of the Common Public License v1.0 
- * which accompanies this distribution and is available at 
- * http://www.eclipse.org/legal/cpl-v10.html 
- *  
- * Contributors: 
- *     PARC     initial implementation 
+ * All rights reserved.
+ * This program and the accompanying materials are made available
+ * under the terms of the Common Public License v1.0
+ * which accompanies this distribution and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ *     PARC     initial implementation
  * ******************************************************************/
 
 package tests;
@@ -30,51 +30,51 @@ public class Test4d extends Test {
     }
 
     public void testBasicEquality() {
-	assertTrue(g.getBounds() == g.getBounds());
+        assertTrue(g.getBounds() == g.getBounds());
     }
 
     public void testNonGroupMove() {
-	p1.move(3, 27);
+        p1.move(3, 27);
     }
 
     public void testEqualityAfterAddition() {
-	Rectangle r = g.getBounds();
-	g.add(new Point(37, 90));
-	assertTrue(g.getBounds() == r);
+        Rectangle r = g.getBounds();
+        g.add(new Point(37, 90));
+        assertTrue(g.getBounds() == r);
     }
 
     public void testEqualityAfterMove() {
-	Point p0 = new Point(1, 2);
-	Point p1 = new Point(2, 3);
-
-	Group g0 = new Group(p0);
-	Group g1 = new Group(p1);
-
-	Rectangle r0 = g0.getBounds();
-	Rectangle r1 = g1.getBounds();
-	assertTrue(r0 != r1);
-	assertTrue(g0.getBounds() == r0);
-	assertTrue(g1.getBounds() != r0);
-	assertTrue(g0.getBounds() != r1);
-	assertTrue(g1.getBounds() == r1);
-
-	p0.move(3, 1);
-	Rectangle r00 = g0.getBounds();
-	Rectangle r10 = g1.getBounds();
-
-	assertTrue(r10 != r00);
-	assertTrue(r0 != r00);
-	assertTrue(g0.getBounds() == r00);
+        Point p0 = new Point(1, 2);
+        Point p1 = new Point(2, 3);
+
+        Group g0 = new Group(p0);
+        Group g1 = new Group(p1);
+
+        Rectangle r0 = g0.getBounds();
+        Rectangle r1 = g1.getBounds();
+        assertTrue(r0 != r1);
+        assertTrue(g0.getBounds() == r0);
+        assertTrue(g1.getBounds() != r0);
+        assertTrue(g0.getBounds() != r1);
+        assertTrue(g1.getBounds() == r1);
+
+        p0.move(3, 1);
+        Rectangle r00 = g0.getBounds();
+        Rectangle r10 = g1.getBounds();
+
+        assertTrue(r10 != r00);
+        assertTrue(r0 != r00);
+        assertTrue(g0.getBounds() == r00);
     }
 
     public void testEqualityAfterMove0() {
-	g = new Group(p1);
-	Rectangle r0 = g.getBounds();
-	assertTrue(g.getBounds() == r0);
-	p1.move(3, 1);
-	Rectangle r1 = g.getBounds();
-	assertTrue(r0 != r1);
-	assertTrue(r1 == g.getBounds());
+        g = new Group(p1);
+        Rectangle r0 = g.getBounds();
+        assertTrue(g.getBounds() == r0);
+        p1.move(3, 1);
+        Rectangle r1 = g.getBounds();
+        assertTrue(r0 != r1);
+        assertTrue(r1 == g.getBounds());
     }
 }
 
diff --git a/docs/teaching/exercises/tests/Test4e.java b/docs/teaching/exercises/tests/Test4e.java
index f6a3635d2..91710b0ea 100644
--- a/docs/teaching/exercises/tests/Test4e.java
+++ b/docs/teaching/exercises/tests/Test4e.java
@@ -1,13 +1,13 @@
 /* *******************************************************************
  * Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
- * All rights reserved. 
- * This program and the accompanying materials are made available 
- * under the terms of the Common Public License v1.0 
- * which accompanies this distribution and is available at 
- * http://www.eclipse.org/legal/cpl-v10.html 
- *  
- * Contributors: 
- *     PARC     initial implementation 
+ * All rights reserved.
+ * This program and the accompanying materials are made available
+ * under the terms of the Common Public License v1.0
+ * which accompanies this distribution and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ *
+ * Contributors:
+ *     PARC     initial implementation
  * ******************************************************************/
 
 package tests;
@@ -30,38 +30,38 @@ public class Test4e extends Test {
     }
 
     public void testBasicEquality() {
-	assertTrue(g.getBounds() == g.getBounds());
+        assertTrue(g.getBounds() == g.getBounds());
     }
 
     public void testNonGroupMove() {
-	p1.move(3, 27);
+        p1.move(3, 27);
     }
 
     public void testEqualityAfterAddition() {
-	Rectangle r = g.getBounds();
-	g.add(new Point(37, 90));
-	assertTrue(g.getBounds() == r);
+        Rectangle r = g.getBounds();
+        g.add(new Point(37, 90));
+        assertTrue(g.getBounds() == r);
     }
 
     public void testEqualityAfterMove() {
-	g = new Group(p1);
-	Rectangle r0 = g.getBounds();
-	assertTrue(g.getBounds() == r0);
-	p1.move(3, 1);
-	Rectangle r1 = g.getBounds();
-	assertTrue(r0 != r1);
-	assertTrue(r1 == g.getBounds());
+        g = new Group(p1);
+        Rectangle r0 = g.getBounds();
+        assertTrue(g.getBounds() == r0);
+        p1.move(3, 1);
+        Rectangle r1 = g.getBounds();
+        assertTrue(r0 != r1);
+        assertTrue(r1 == g.getBounds());
     }
 
     public void testSecondEnclosingGroup() {
-	g = new Group(p1);
-	Group h = new Group(g);
-	Rectangle r0 = h.getBounds();
-	assertTrue(h.getBounds() == r0);
-	p1.move(3, 1);
-	Rectangle r1 = h.getBounds();
-	assertTrue(r0 != r1);
-	assertTrue(r1 == h.getBounds());
+        g = new Group(p1);
+        Group h = new Group(g);
+        Rectangle r0 = h.getBounds();
+        assertTrue(h.getBounds() == r0);
+        p1.move(3, 1);
+        Rectangle r1 = h.getBounds();
+        assertTrue(r0 != r1);
+        assertTrue(r1 == h.getBounds());
     }
 }