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23 
24 /**
25  * @test
26  * @bug 7198904
27  * @summary Verify that cloned TreeMap gets new keyset
28  * @author david.buck@oracle.com
29  * @run main/othervm Clone
30  */
31 
32 import java.util.TreeMap;
33 
34 public class Clone  {
35 
main(String[] args)36     public static void main(String[] args) throws Exception {
37         TreeMap<String,Object> m1 = new TreeMap<String,Object>();
38         m1.put( "one", 1 );
39         m1.keySet();
40         TreeMap<String,Object> m2 = (TreeMap<String,Object>)m1.clone();
41         m1.put( "two", 2 );
42         m2.put( "three", 3 );
43         // iterate over the clone (m2) and we should get "one" and "three"
44         for( final String key : m2.keySet() ) {
45             if( !"one".equals( key ) && !"three".equals( key ) ) {
46                 throw new IllegalStateException( "Unexpected key: " + key );
47             }
48         }
49         // iterate over the original (m1) and we should get "one" and "two"
50         for( final String key : m1.keySet() ) {
51             if( !"one".equals( key ) && !"two".equals( key ) ) {
52                 throw new IllegalStateException( "Unexpected key: " + key );
53             }
54         }
55     }
56 
57 }
58