Set: add(String e) : Set « java.util « Java by API

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

Set: add(String e)

 

import java.util.HashSet;
import java.util.Set;

public class Main {

  public static void main(String[] a) {
    Set<String> set = new HashSet<String>();
    set.add("Hello");
    if (set.add("Hello")) {
      System.out.println("addition successful");
    } else {
      System.out.println("addition failed");
    }
  }
}

   
  

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