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23 
24 /*
25  * @test
26  * @bug     8047795
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.BiFunction;
35 
36 public class CheckedMapReplaceAll {
main(String[] args)37     public static void main(String[] args) {
38         Map<Integer,Double> unwrapped = new HashMap<>();
39         unwrapped.put(1, 1.0);
40         unwrapped.put(2, 2.0);
41         unwrapped.put(3, 3.0);
42 
43         Map<Integer,Double> wrapped = Collections.checkedMap(unwrapped, Integer.class, Double.class);
44 
45         BiFunction evil = (k, v) -> (((int)k) % 2 != 0) ? v : "evil";
46 
47         try {
48             wrapped.replaceAll(evil);
49             System.out.printf("Bwahaha! I have defeated you! %s\n", wrapped);
50             throw new RuntimeException("String added to checked Map<Integer,Double>");
51         } catch (ClassCastException thwarted) {
52             thwarted.printStackTrace(System.out);
53             System.out.println("Curses! Foiled again!");
54         }
55     }
56 }
57