src/share/classes/java/lang/StringBuilder.java

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@@ -398,10 +398,40 @@
     public StringBuilder reverse() {
         super.reverse();
         return this;
     }
 
+    /**
+     * @throws NullPointerException {@inheritDoc}
+     * @since 1.7
+     */
+    @Override
+    public StringBuilder join(String delimiter, Object first, Object... elements) {
+        super.join(delimiter, first, elements);
+        return this;
+    }
+    
+    /**
+     * @throws NullPointerException {@inheritDoc}
+     * @since 1.7
+     */
+    @Override
+    public StringBuilder join(String delimiter, Object[] elements) {
+        super.join(delimiter, elements);
+        return this;
+    }
+    
+    /**
+     * @throws NullPointerException {@inheritDoc}
+     * @since 1.7
+     */
+    @Override
+    public StringBuilder join(String delimiter, Iterable<?> elements) {
+        super.join(delimiter, elements);
+        return this;
+    } 
+    
     public String toString() {
         // Create a copy, don't share the array
         return new String(value, 0, count);
     }