8225235: Unused field defaultIndex in NetworkInterface

Reviewed-by: chegar, vtewari, dfuchs, jpai

Author: viktorklang-ora

Diff for: src/java.base/share/classes/java/net/NetworkInterface.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2022, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -53,18 +53,12 @@ public final class NetworkInterface {
     private NetworkInterface parent = null;
     private boolean virtual = false;
     private static final NetworkInterface defaultInterface;
-    private static final int defaultIndex; /* index of defaultInterface */
 
     static {
         jdk.internal.loader.BootLoader.loadLibrary("net");
 
         init();
         defaultInterface = DefaultInterface.getDefault();
-        if (defaultInterface != null) {
-            defaultIndex = defaultInterface.getIndex();
-        } else {
-            defaultIndex = 0;
-        }
     }
 
     /**

Diff for: src/java.base/unix/native/libnet/NetworkInterface.c

@@ -101,7 +101,6 @@ jfieldID ni_bindsID;
 jfieldID ni_virutalID;
 jfieldID ni_childsID;
 jfieldID ni_parentID;
-jfieldID ni_defaultIndexID;
 jmethodID ni_ctrID;
 
 static jclass ni_ibcls;
@@ -187,9 +186,7 @@ JNIEXPORT void JNICALL Java_java_net_NetworkInterface_init
     CHECK_NULL(ni_ib4broadcastID);
     ni_ib4maskID = (*env)->GetFieldID(env, ni_ibcls, "maskLength", "S");
     CHECK_NULL(ni_ib4maskID);
-    ni_defaultIndexID = (*env)->GetStaticFieldID(env, ni_class, "defaultIndex",
-                                                 "I");
-    CHECK_NULL(ni_defaultIndexID);
+
     initInetAddressIDs(env);
 }