Stack contains() method in Java with Example
Last Updated :
24 Dec, 2018
The java.util.Stack.contains() method is used to check whether a specific element is present in the Stack or not. So basically it is used to check if a Stack contains any particular element or not.
Syntax:
Stack.contains(Object element)
Parameters: This method takes a mandatory parameter element which is of the type of Stack. This is the element that needs to be tested if it is present in the Stack or not.
Return Value: This method returns True if the element is present in the Stack otherwise it returns False.
Below programs illustrate the Java.util.Stack.contains() method:
Program 1:
import java.util.*;
public class StackDemo {
public static void main(String args[])
{
Stack<String> stack = new Stack<String>();
stack.add("Welcome");
stack.add("To");
stack.add("Geeks");
stack.add("4");
stack.add("Geeks");
System.out.println("Stack: " + stack);
System.out.println("Does the Stack contains 'Geeks'? "
+ stack.contains("Geeks"));
System.out.println("Does the Stack contains '4'? "
+ stack.contains("4"));
System.out.println("Does the Stack contains 'No'? "
+ stack.contains("No"));
}
}
|
Output:
Stack: [Welcome, To, Geeks, 4, Geeks]
Does the Stack contains 'Geeks'? true
Does the Stack contains '4'? true
Does the Stack contains 'No'? false
Program 2:
import java.util.*;
public class StackDemo {
public static void main(String args[])
{
Stack<Integer> stack = new Stack<Integer>();
stack.add(10);
stack.add(15);
stack.add(30);
stack.add(20);
stack.add(5);
System.out.println("Stack: " + stack);
System.out.println("Does the Stack contains 'Geeks'? "
+ stack.contains("Geeks"));
System.out.println("Does the Stack contains '4'? "
+ stack.contains("4"));
System.out.println("Does the Stack contains 'No'? "
+ stack.contains("No"));
}
}
|
Output:
Stack: [10, 15, 30, 20, 5]
Does the Stack contains 'Geeks'? false
Does the Stack contains '4'? false
Does the Stack contains 'No'? false
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