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

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Collections: singletonList(T o)

  
import java.util.Collections;

public class Main {
  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"));
  
  }
}










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