If contain a certain object

ReturnMethodSummary
booleancontains(Object o)Returns true if this list contains the specified element.

  import java.util.ArrayList;
import java.util.List;

public class Main {
  public static void main(String args[]) {
    ArrayList<String> al = new ArrayList<String>();

    al.add("C");
    al.add("A");
    al.add("E");
    al.add("java2s.com");
    al.add("D");
    al.add("F");
    al.add(1, "java2s.com");

    System.out.println(al);

    
    System.out.println(al.contains("java2s.com"));

  }

}
  

The output:


[C, java2s.com, A, E, java2s.com, D, F]
true
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