How to Reverse a Vector in Java - Step by Step Examples

How to Reverse a Vector in Java ?

Answer

To reverse a vector in Java using java.util.Vector, you can iterate through the vector and swap elements from both ends until reaching the middle.

✐ Examples

1 Reverse a Vector of Integers

In this example,

We create a Vector named intVector containing integers.
We use two pointers, one pointing to the start and the other to the end of the vector.
We swap elements at these pointers iteratively until the pointers meet in the middle.

Java Program

import java.util.Vector;

public class Main {
    public static void main(String[] args) {
        Vector<Integer> intVector = new Vector<>();
        intVector.add(1);
        intVector.add(2);
        intVector.add(3);
        intVector.add(4);
        intVector.add(5);
        int left = 0;
        int right = intVector.size() - 1;
        while (left < right) {
            int temp = intVector.get(left);
            intVector.set(left, intVector.get(right));
            intVector.set(right, temp);
            left++;
            right--;
        }
        System.out.println(intVector);
    }
}

Output

[5, 4, 3, 2, 1]

2 Reverse a Vector of Characters

In this example,

We create a Vector named charVector containing characters.
We use two pointers, one pointing to the start and the other to the end of the vector.
We swap elements at these pointers iteratively until the pointers meet in the middle.

Java Program

import java.util.Vector;

public class Main {
    public static void main(String[] args) {
        Vector<Character> charVector = new Vector<>();
        charVector.add('a');
        charVector.add('b');
        charVector.add('c');
        charVector.add('d');
        charVector.add('e');
        int left = 0;
        int right = charVector.size() - 1;
        while (left < right) {
            char temp = charVector.get(left);
            charVector.set(left, charVector.get(right));
            charVector.set(right, temp);
            left++;
            right--;
        }
        System.out.println(charVector);
    }
}

Output

[e, d, c, b, a]

Summary

In this tutorial, we learned How to Reverse a Vector in Java language with well detailed examples.

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How to Reverse a Vector in Java - Step by Step Examples

How to Reverse a Vector in Java ?

Answer

✐ Examples

1 Reverse a Vector of Integers

Java Program

Output

2 Reverse a Vector of Characters

Java Program

Output

Summary

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