Java ArrayList contains() Method Example

ArrayList Methods with Examples

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• Java ArrayList add() Method
• Java ArrayList addAll() Method
• Java ArrayList clear() Method
• Java ArrayList contains() Method
• Java ArrayList ensureCapacity() Method
• Java ArrayList clone() Method
• Java ArrayList get() Method
• Java ArrayList indexOf() Method
• Java ArrayList remove() Method
• Java ArrayList removeAll() Method
• Java ArrayList removeIf() Method
• Java ArrayList retainAll() Method
• Java ArrayList sort() Method
• Java ArrayList spliterator() Method

Java ArrayList Examples

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• Java ArrayBlockingQueue Example
• Java Convert Array to Set
• Copying part of Array in Java Example
• Sorting an Array using Arrays.sort() Method
• Check Two Arrays are Deeply Equal
• Java Arrays.copyOf() Example - Copying an Array
• Java Arrays.binarySearch() Example - Searching an Array
• Java Arrays.asList() Example - Convert Array to ArrayList
• Java Convert Array to Stack Example
• What's the Simplest Way to Print a Java Array?
• Java Pyramid Examples
• How to Check if Two Arrays are Equal in Java
• Create and Initialize Two Dimensional Array in Java
• How to Initialize an Array in Java in One Line
• Java Array - Create, Declare, Initialize and Print Examples
• Java Array Simple Program

ArrayList contains() method is used to check if the specified element exists in the given ArrayList or not. If the element exists then the method returns true, else false.

Java ArrayList contains() Method Example

The following example shows the usage of java.util.ArrayList.contains method:

import java.util.ArrayList;

public class ArrayListDemo {
   public static void main(String[] args) {
      
      // create an empty array list with an initial capacity
      ArrayList<Integer> arrlist = new ArrayList<Integer>(8);

      // use add() method to add elements in the list
      arrlist.add(20);
      arrlist.add(25);
      arrlist.add(10);
      arrlist.add(15);        
          
      // let us print all the elements available in list
      for (Integer number : arrlist) {
         System.out.println("Number = " + number);
      }

      // list contains element 10
      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");
      }
         
      // list does not contain element 30
      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");    
      }
   }
}

Let us compile and run the above program, this will produce the following result −

Number = 20
Number = 25
Number = 10
Number = 15
element 10 is contained in the list
element 30 is not contained in the list

References

https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/ArrayList.html