Use StringBuilder instead of StringBuffer

Author: gzsombor

org.eclipse.jdt.debug.ui/ui/org/eclipse/jdt/internal/debug/ui/actions/CompareObjectsAction.java

@@ -462,7 +462,7 @@ private void displayMapResultsInDialogBox(Map<IJavaVariable, Object> result) thr
 	 */
 	@SuppressWarnings("nls")
 	private String printListContents(String Selection, List<String> list, int displayLimit) {
-		StringBuffer content = new StringBuffer();
+		StringBuilder content = new StringBuilder();
 		content.append("[");
 		content.append(list.stream().limit(displayLimit).collect(Collectors.joining(",")));
 		content.append("......]");

org.eclipse.jdt.debug.ui/ui/org/eclipse/jdt/internal/debug/ui/console/JavaStackTraceHyperlink.java

@@ -226,7 +226,7 @@ public IStatus runInUIThread(IProgressMonitor monitor) {
 					try {
 						return processAmbiguousResults(matches, typeName, lineNumber, link);
 					} catch(Exception e) {
-						StringBuffer temp = new StringBuffer();
+						StringBuilder temp = new StringBuilder();
 						temp.append("Unable to parse \"" + link + "\" \n "); //$NON-NLS-1$ //$NON-NLS-2$
 						temp.append(e.getClass().getSimpleName());
 						exceptionHandler(temp.toString(), e);