src/java.desktop/share/classes/javax/swing/DefaultComboBoxModel.java

*** 1,7 ****
  /*
!  * Copyright (c) 1998, 2014, 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
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
--- 1,7 ----
  /*
!  * Copyright (c) 1998, 2018, 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
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
*** 22,33 ****
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  package javax.swing;
  
! import java.util.*;
! 
  import java.io.Serializable;
  
  /**
   * The default model for combo boxes.
   *
--- 22,33 ----
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  package javax.swing;
  
! import java.util.Collection;
! import java.util.Vector;
  import java.io.Serializable;
  
  /**
   * The default model for combo boxes.
   *
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              fireIntervalRemoved(this, firstIndex, lastIndex);
          } else {
              selectedObject = null;
          }
      }
+ 
+     /**
+      * Adds all of the elements present in the collection.
+      *
+      * @param c the collection which contains the elements to add
+      * @throws NullPointerException if {@code c} is null
+      */
+     public void addAll(Collection<? extends E> c) {
+         if (c.isEmpty()) {
+             return;
+         }
+ 
+         int startIndex = getSize();
+ 
+         objects.addAll(c);
+         fireIntervalAdded(this, startIndex, getSize() - 1);
+     }
+ 
+     /**
+      * Adds all of the elements present in the collection, starting
+      * from the specified index.
+      *
+      * @param index index at which to insert the first element from the
+      * specified collection
+      * @param c the collection which contains the elements to add
+      * @throws ArrayIndexOutOfBoundsException if {@code index} does not
+      * fall within the range of number of elements currently held
+      * @throws NullPointerException if {@code c} is null
+      */
+     public void addAll(int index, Collection<? extends E> c) {
+         if (index < 0 || index > getSize()) {
+             throw new ArrayIndexOutOfBoundsException("index out of range: " +
+                                                                        index);
+         }
+ 
+         if (c.isEmpty()) {
+             return;
+         }
+ 
+         objects.addAll(index, c);
+         fireIntervalAdded(this, index, index + c.size() - 1);
+     }
  }