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Stack removeRange() method in Java with Example
  • Last Updated : 24 Dec, 2018

The removeRange() method of Stack in Java is used to remove all elements within the specified range from an Stack object. It shifts any succeeding elements to the left. This call shortens the stack by (toIndex-fromIndex) elements where toIndex is the ending index and fromIndex is the starting index within which all elements are to be removed. (If toIndex==fromIndex, this operation has no effect)

Syntax:

removeRange(int fromIndex, int toIndex)

Parameters: This methid takes two parameters:

  • fromIndex: starting index from which index elements are to be removed.
  • toIndex: within range[fromIndex-toIndex), all elements are removed.

Return Value: This method does not return any value. It only removes all the elements within the specified range.

Exceptions: This method throws indexOutOfBoundsException if fromIndex or toIndex is out of range (fromIndex = size() or toIndex > size() or toIndex < fromIndex)



Below examples illustrate the Stack.removeRange() method:

Example 1 : Demonstrating the use of removeRange() method




// Java program to demonstrate the
// working of removeRange() method
  
import java.util.*;
  
// extending the class to stackyastack since removeRange()
// is a protected method
public class GFG extends Stack<Integer> {
  
    public static void main(String[] args)
    {
  
        // create an empty  stack
  
        GFG stack = new GFG();
  
        // use add() method to add values in the stack
        stack.add(1);
        stack.add(2);
        stack.add(3);
        stack.add(12);
        stack.add(9);
        stack.add(13);
  
        // prints the stack before removing
        System.out.println("The stack before using removeRange:"
                           + stack);
  
        // removing range of 1st 2 elements
        stack.removeRange(0, 2);
        System.out.println("The stack after using removeRange:"
                           + stack);
    }
}


Output:

The stack before using removeRange:[1, 2, 3, 12, 9, 13]
The stack after using removeRange:[3, 12, 9, 13]

Example 2 : Program to demonstrate error




// Java program to demonstrate the error in
// working of removeRange() method
  
import java.util.*;
  
// extending the class to stackyastack since removeRange()
// is a protected method
public class GFG extends Stack<Integer> {
  
    public static void main(String[] args)
    {
  
        // create an empty stack stack
  
        GFG stack = new GFG();
  
        // use add() method to add values in the stack
        stack.add(1);
        stack.add(2);
        stack.add(3);
  
        try {
            // error as 4 is out of range
            stack.removeRange(1, 4);
  
            System.out.println("The stack after using removeRange:"
                               + stack);
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}


Output:

java.lang.ArrayIndexOutOfBoundsException

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