What does the method contains(obj o) do in java?

Java 8Object Oriented ProgrammingProgramming

The contains(Object) method of the java.util.ArrayList class returns true if this list contains the specified element.

Example

import java.util.ArrayList;

public class ArrayListDemo {
   public static void main(String[] args) {
      ArrayList<Integer> arrlist = new ArrayList<Integer<(8);
      arrlist.add(20);
      arrlist.add(25);
      arrlist.add(10);
      arrlist.add(15);
      for (Integer number : arrlist) {
         System.out.println("Number = " + number);
      }
      boolean retval = arrlist.contains(10);
      if (retval == true) {
         System.out.println("element 10 is contained in the list");
      } else {
         System.out.println("element 10 is not contained in the list");
      }
      boolean retval2 = arrlist.contains(30);
      if (retval2 == true) {
         System.out.println("element 30 is contained in the list");
      } else {
         System.out.println("element 30 is not contained in the list");
      }
   }
}

Output

Number = 20
Number = 25
Number = 10
Number = 15
element 10 is contained in the list
element 30 is not contained in the list
raja
Published on 08-Feb-2018 08:00:58
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