Collections Java Tutorial

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import java.util.Collections;
public class MainClass{
  public static void main(String[] a){
     System.out.println(Collections.singletonList("a")); 
     System.out.println(Collections.singleton("a"));
     System.out.println(Collections.singletonMap("a","b"));
  
  }
}
[a]
[a]
{a=b}