1 files changed, 63 insertions, 0 deletions
diff --git a/tests/features198/java17/SwitchPatternOK.java b/tests/features198/java17/SwitchPatternOK.java
new file mode 100644
index 000000000..26c1cf755
--- /dev/null
+++ b/tests/features198/java17/SwitchPatternOK.java
@@ -0,0 +1,63 @@
+import java.util.List;
+
+/**
+ * Inspired by examples in https://openjdk.java.net/jeps/406
+ */
+public class SwitchPatternOK {
+  public static void main(String[] args) {
+    System.out.println(formatterPatternSwitch(null));
+    System.out.println(formatterPatternSwitch(123));
+    System.out.println(formatterPatternSwitch(999L));
+    System.out.println(formatterPatternSwitch(12.34));
+    System.out.println(formatterPatternSwitch("foo"));
+    System.out.println(formatterPatternSwitch(List.of(123, "foo", 999L, 12.34)));
+
+    System.out.println(testCircle(new Rectangle()));
+    System.out.println(testCircle(new Circle(5)));
+    System.out.println(testCircle(new Circle(6)));
+
+    System.out.println(testSealedCoverage(new A()));
+    System.out.println(testSealedCoverage(new B()));
+    System.out.println(testSealedCoverage(new C(5)));
+  }
+
+  static String formatterPatternSwitch(Object o) {
+    return switch (o) {
+      case null      -> "null";
+      case Integer i -> String.format("int %d", i);
+      case Long l    -> String.format("long %d", l);
+      case Double d  -> String.format("double %f", d);
+      case String s  -> String.format("String %s", s);
+      default        -> o.toString();
+    };
+  }
+
+  static class Shape {}
+  static class Rectangle extends Shape {}
+  static class Circle extends Shape {
+    private final double radius;
+    public Circle(double radius) { this.radius = radius; }
+    double calculateArea() { return Math.PI * radius * radius; }
+  }
+
+  static String testCircle(Shape s) {
+    return switch (s) {
+      case Circle c && (c.calculateArea() > 100) -> "Large circle";
+      case Circle c -> "Small circle";
+      default -> "Non-circle";
+    };
+  }
+
+  sealed interface S permits A, B, C {}
+  final static class A implements S {}
+  final static class B implements S {}
+  static record C(int i) implements S {}  // Implicitly final
+
+  static String testSealedCoverage(S s) {
+    return switch (s) {
+      case A a -> "Sealed sub-class A";
+      case B b -> "Sealed sub-class B";
+      case C c -> "Sealed sub-record C";
+    };
+  }
+}