Avoid String.toLowerCase() using equalsIgnoreCase

Author: jukzi

org.eclipse.jdt.core.compiler.batch/src/org/eclipse/jdt/internal/compiler/batch/Main.java

@@ -1272,7 +1272,7 @@ public void setLog(String logFileName) {
 			try {
 				int index = logFileName.lastIndexOf('.');
 				if (index != -1) {
-					if (logFileName.substring(index).toLowerCase().equals(".xml")) { //$NON-NLS-1$
+					if (logFileName.substring(index).equalsIgnoreCase(".xml")) { //$NON-NLS-1$
 						this.log = new GenericXMLWriter(new OutputStreamWriter(new FileOutputStream(logFileName, false), Util.UTF_8), Util.LINE_SEPARATOR, true);
 						this.tagBits |= Logger.XML;
 						// insert time stamp as comment

org.eclipse.jdt.core.compiler.batch/src/org/eclipse/jdt/internal/compiler/tool/EclipseFileManager.java

@@ -958,7 +958,7 @@ private boolean isArchive(File f) {
 	}
 
 	private boolean isJrt(File f) {
-		return f.getName().toLowerCase().equals(JrtFileSystem.BOOT_MODULE);
+		return f.getName().equalsIgnoreCase(JrtFileSystem.BOOT_MODULE);
 	}
 
 	/* (non-Javadoc)

org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/builder/ClasspathDirectory.java

@@ -264,7 +264,7 @@ public char[][] listPackages() {
 	try {
 		this.binaryFolder.accept(r -> {
 			String extension = r.getFileExtension();
-			if (r instanceof IFile && extension != null && SuffixConstants.EXTENSION_class.equals(extension.toLowerCase())) {
+			if (r instanceof IFile && extension != null && SuffixConstants.EXTENSION_class.equalsIgnoreCase(extension)) {
 				packageNames.add(r.getParent().getFullPath().makeRelativeTo(basePath).toString().replace('/', '.'));
 			}
 			return true;