8311162: Simplify and modernize equals and hashCode for java.net

Reviewed-by: dfuchs, michaelm, msheppar

src/java.base/share/classes/java/net/NetworkInterface.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2023, 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
@@ -28,6 +28,7 @@
 import java.util.Arrays;
 import java.util.Enumeration;
 import java.util.NoSuchElementException;
+import java.util.Objects;
 import java.util.Spliterator;
 import java.util.Spliterators;
 import java.util.stream.Stream;
@@ -586,18 +587,13 @@ public boolean isVirtual() {
      *          {@code false} otherwise.
      * @see     java.net.InetAddress#getAddress()
      */
+    @Override
     public boolean equals(Object obj) {
         if (!(obj instanceof NetworkInterface that)) {
             return false;
         }
-        if (this.name != null ) {
-            if (!this.name.equals(that.name)) {
-                return false;
-            }
-        } else {
-            if (that.name != null) {
-                return false;
-            }
+        if (!Objects.equals(this.name, that.name)) {
+            return false;
         }
 
         if (this.addrs == null) {
@@ -612,13 +608,10 @@ public boolean equals(Object obj) {
             return false;
         }
 
-        InetAddress[] thatAddrs = that.addrs;
-        int count = thatAddrs.length;
-
-        for (int i=0; i<count; i++) {
+        for (InetAddress thisAddr : this.addrs) {
             boolean found = false;
-            for (int j=0; j<count; j++) {
-                if (addrs[i].equals(thatAddrs[j])) {
+            for (InetAddress thatAddr : that.addrs) {
+                if (thisAddr.equals(thatAddr)) {
                     found = true;
                     break;
                 }
@@ -630,8 +623,9 @@ public boolean equals(Object obj) {
         return true;
     }
 
+    @Override
     public int hashCode() {
-        return name == null? 0: name.hashCode();
+        return Objects.hashCode(name);
     }
 
     public String toString() {

src/java.base/share/classes/java/net/Proxy.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2023, 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
@@ -25,6 +25,8 @@
 
 package java.net;
 
+import java.util.Objects;
+
 /**
  * This class represents a proxy setting, typically a type (http, socks) and
  * a socket address.
@@ -145,23 +147,20 @@ public String toString() {
      *          {@code false} otherwise.
      * @see java.net.InetSocketAddress#equals(java.lang.Object)
      */
+    @Override
     public final boolean equals(Object obj) {
         if (!(obj instanceof Proxy p))
             return false;
         if (p.type() == type()) {
-            if (address() == null) {
-                return (p.address() == null);
-            } else
-                return address().equals(p.address());
+            return Objects.equals(address(), p.address());
         }
         return false;
     }
 
     /**
-     * Returns a hashcode for this Proxy.
-     *
-     * @return  a hash code value for this Proxy.
+     * {@return a hash code value for this Proxy}
      */
+    @Override
     public final int hashCode() {
         if (address() == null)
             return type().hashCode();

src/java.base/share/classes/java/net/URLPermission.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2013, 2023, 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
@@ -32,6 +32,7 @@
 import java.util.Collections;
 import java.security.Permission;
 import java.util.Locale;
+import java.util.Objects;
 
 /**
  * Represents permission to access a resource or set of resources defined by a
@@ -376,6 +377,7 @@ public boolean implies(Permission p) {
      * Returns true if, this.getActions().equals(p.getActions())
      * and p's url equals this's url.  Returns false otherwise.
      */
+    @Override
     public boolean equals(Object p) {
         if (!(p instanceof URLPermission that)) {
             return false;
@@ -389,22 +391,19 @@ public boolean equals(Object p) {
         if (!this.authority.equals(that.authority)) {
             return false;
         }
-        if (this.path != null) {
-            return this.path.equals(that.path);
-        } else {
-            return that.path == null;
-        }
+        return Objects.equals(this.path, that.path);
     }
 
     /**
      * Returns a hashcode calculated from the hashcode of the
      * actions String and the url string.
      */
+    @Override
     public int hashCode() {
         return getActions().hashCode()
             + scheme.hashCode()
             + authority.hashCode()
-            + (path == null ? 0 : path.hashCode());
+            + Objects.hashCode(path);
     }