--- old/src/java.base/share/classes/java/lang/ThreadGroup.java	2018-09-28 11:28:44.997908797 +0700
+++ new/src/java.base/share/classes/java/lang/ThreadGroup.java	2018-09-28 11:28:44.597908797 +0700
@@ -63,10 +63,10 @@
 
     int nUnstartedThreads = 0;
     int nthreads;
-    Thread threads[];
+    Thread[] threads;
 
     int ngroups;
-    ThreadGroup groups[];
+    ThreadGroup[] groups;
 
     /**
      * Creates an empty Thread group that is not in any Thread group.
@@ -377,7 +377,7 @@
      *
      * @since   1.0
      */
-    public int enumerate(Thread list[]) {
+    public int enumerate(Thread[] list) {
         checkAccess();
         return enumerate(list, 0, true);
     }
@@ -415,12 +415,12 @@
      *
      * @since   1.0
      */
-    public int enumerate(Thread list[], boolean recurse) {
+    public int enumerate(Thread[] list, boolean recurse) {
         checkAccess();
         return enumerate(list, 0, recurse);
     }
 
-    private int enumerate(Thread list[], int n, boolean recurse) {
+    private int enumerate(Thread[] list, int n, boolean recurse) {
         int ngroupsSnapshot = 0;
         ThreadGroup[] groupsSnapshot = null;
         synchronized (this) {
@@ -511,7 +511,7 @@
      *
      * @since   1.0
      */
-    public int enumerate(ThreadGroup list[]) {
+    public int enumerate(ThreadGroup[] list) {
         checkAccess();
         return enumerate(list, 0, true);
     }
@@ -549,12 +549,12 @@
      *
      * @since   1.0
      */
-    public int enumerate(ThreadGroup list[], boolean recurse) {
+    public int enumerate(ThreadGroup[] list, boolean recurse) {
         checkAccess();
         return enumerate(list, 0, recurse);
     }
 
-    private int enumerate(ThreadGroup list[], int n, boolean recurse) {
+    private int enumerate(ThreadGroup[] list, int n, boolean recurse) {
         int ngroupsSnapshot = 0;
         ThreadGroup[] groupsSnapshot = null;
         synchronized (this) {