1 /*
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23 
24 /*
25  * @test
26  * @bug     8047795 8053938
27  * @summary Ensure that replaceAll operator cannot add bad elements
28  * @author  Mike Duigou
29  */
30 
31 package test.java.util.Collections;
32 
33 import java.util.*;
34 import java.util.function.UnaryOperator;
35 
36 public class CheckedListReplaceAll {
main(String[] args)37     public static void main(String[] args) {
38         List unwrapped = Arrays.asList(new Object[]{1, 2, 3});
39         List<Object> wrapped = Collections.checkedList(unwrapped, Integer.class);
40 
41         UnaryOperator evil = e -> (((int) e) % 2 != 0) ? e : "evil";
42 
43         try {
44             wrapped.replaceAll(evil);
45             System.out.printf("Bwahaha! I have defeated you! %s\n", wrapped);
46             throw new RuntimeException("String added to checked List<Integer>");
47         } catch (ClassCastException thwarted) {
48             thwarted.printStackTrace(System.out);
49             System.out.println("Curses! Foiled again!");
50         }
51 
52         unwrapped = Arrays.asList(new Object[]{});  // Empty list
53         wrapped = Collections.checkedList(unwrapped, Integer.class);
54         try {
55             wrapped.replaceAll((UnaryOperator)null);
56             System.out.printf("Bwahaha! I have defeated you! %s\n", wrapped);
57             throw new RuntimeException("NPE not thrown when passed a null operator");
58         } catch (NullPointerException thwarted) {
59             thwarted.printStackTrace(System.out);
60             System.out.println("Curses! Foiled again!");
61         }
62     }
63 }
64