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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main(String[] args) {
  11.         GettingEmSafety safety = new GettingEmSafety();
  12.         System.out.println(safety.getValues());
  13.         safety.getValues().removeAll(safety.getValues());
  14.         System.out.println(safety.getValues());
  15.     }
  16. }
  17.  
  18. class GettingEmSafety {
  19.     private final Collection<String> values;
  20.  
  21.     public GettingEmSafety() {
  22.         values = new ArrayList<>();
  23.         values.add("First");
  24.         values.add("Second");
  25.     }
  26.  
  27.     private class MyCol extends ArrayList<String> {
  28.         public MyCol(Collection c) {
  29.             super(c);
  30.         }
  31.  
  32.         @Override
  33.         public boolean removeAll(Collection c) {
  34.             return true;
  35.         }
  36.     }
  37.  
  38.     public Collection<String> getValues() {
  39.         MyCol col = new MyCol(this.values);
  40.         return col;
  41.     }
  42. }
Success #stdin #stdout 0.09s 320256KB
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Standard input is empty
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[First, Second]
[First, Second]
https://ideone.com/th1XNK
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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