Stack setSize() method in Java with Example

Last Updated : 24 Dec, 2018

The setSize() method of Java.util.Stack class changes the size of this Stack instance to the size passed as the parameter. Syntax:

public void setSize(int size)

Parameters: This method takes the new size as a parameter. Exception: This method throws ArrayIndexOutOfBoundsException if the new size is negative. Below are the examples to illustrate the setSize() method. Example 1:

Java

// Java program to demonstrate
// setSize() method for Integer value

import java.util.*;

public class GFG1 {
    public static void main(String[] argv)
    {

        try {

            // Creating object of Stack<Integer>
            Stack<Integer>
                stack = new Stack<Integer>();

            // adding element to stack
            stack.add(10);
            stack.add(20);
            stack.add(30);
            stack.add(40);

            // Print the Stack
            System.out.println("Stack: " + stack);

            // Print the current size of Stack
            System.out.println("Current size of Stack: "
                               + stack.size());

            // Change the size to 10
            stack.setSize(10);

            // Print the current size of Stack
            System.out.println("New size of Stack: "
                               + stack.size());
        }

        catch (Exception e) {
            System.out.println("Exception thrown : " + e);
        }
    }
}

Output:

Stack: [10, 20, 30, 40]
Current size of Stack: 4
New size of Stack: 10

Example 2:

Java

// Java program to demonstrate
// setSize() method for String value

import java.util.*;

public class GFG1 {
    public static void main(String[] argv)
    {

        try {

            // Creating object of Stack<Integer>
            Stack<String>
                stack = new Stack<String>();

            // adding element to stack
            stack.add("A");
            stack.add("B");
            stack.add("C");
            stack.add("D");

            // Print the Stack
            System.out.println("Stack: "
                               + stack);

            // Print the current size of Stack
            System.out.println("Current size of Stack: "
                               + stack.size());

            // Change the size to -1
            stack.setSize(-1);

            // Print the current size of Stack
            System.out.println("New size of Stack: "
                               + stack.size());
        }

        catch (Exception e) {
            System.out.println("Exception thrown : " + e);
        }
    }
}

Output:

Stack: [A, B, C, D]
Current size of Stack: 4
Exception thrown : java.lang.ArrayIndexOutOfBoundsException: -1

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