Collections: singleton(T o) : Collections « java.util « Java by API

1. Java by API
2. java.util
3. Collections

Collections: singleton(T o)

  
/*
 Output:

[Two, Three, One, Two, Three]
[Two, Three, Two, Three]

 * */

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

public class MainClass {
  public static void main(String args[]) {
    String init[] = { "One", "Two", "Three", "One", "Two", "Three" };
    List list1 = new ArrayList(Arrays.asList(init));
    List list2 = new ArrayList(Arrays.asList(init));
    list1.remove("One");
    System.out.println(list1);
    list2.removeAll(Collections.singleton("One"));
    System.out.println(list2);
  }
}
           
         
    
  

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