use equalsIgnoreCase for case-insensitive string comparisons

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1761843 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/hssf/usermodel/HSSFDataFormat.java

@@ -20,7 +20,6 @@ package org.apache.poi.hssf.usermodel;
 import java.util.Arrays;
 import java.util.Iterator;
 import java.util.List;
-import java.util.Locale;
 import java.util.Vector;
 
 import org.apache.poi.hssf.model.InternalWorkbook;
@@ -90,7 +89,7 @@ public final class HSSFDataFormat implements DataFormat {
 	public short getFormat(String pFormat) {
 	   // Normalise the format string
 		String format;
-		if (pFormat.toUpperCase(Locale.ROOT).equals("TEXT")) {
+		if (pFormat.equalsIgnoreCase("TEXT")) {
 			format = "@";
 		} else {
 			format = pFormat;