How to Iterate Over a Vector in Reverse Order in Java - Step by Step Examples

How to Iterate Over a Vector in Reverse Order in Java ?

Answer

To iterate over a vector in reverse order in Java using java.util.Vector, you can use a standard for loop starting from the last index down to zero.

✐ Examples

1 Iterate Over a Numeric Vector in Reverse Order

In this example,

We create a Vector named numVec containing several numeric values.
We use a standard for loop with the loop variable i initialized to numVec.size() - 1, which is the index of the last element in the vector.
We continue the loop as long as i is greater than or equal to zero.
Inside the loop, we access each element of the vector using the index i and print it, effectively traversing the vector in reverse order.

Java Program

import java.util.Vector;

public class Main {
    public static void main(String[] args) {
        Vector<Integer> numVec = new Vector<Integer>();
        numVec.add(10);
        numVec.add(20);
        numVec.add(30);
        numVec.add(40);
        numVec.add(50);
        for (int i = numVec.size() - 1; i >= 0; i--) {
            System.out.println(numVec.get(i));
        }
    }
}

Output

2 Iterate Over a String Vector in Reverse Order

In this example,

We create a Vector named strVec containing several strings.
We use a standard for loop with the loop variable i initialized to strVec.size() - 1, which is the index of the last string element in the vector.
We continue the loop as long as i is greater than or equal to zero.
Inside the loop, we access each string element of the vector using the index i and print it, effectively traversing the vector in reverse order.

Java Program

import java.util.Vector;

public class Main {
    public static void main(String[] args) {
        Vector<String> strVec = new Vector<String>();
        strVec.add("apple");
        strVec.add("banana");
        strVec.add("cherry");
        strVec.add("date");
        for (int i = strVec.size() - 1; i >= 0; i--) {
            System.out.println(strVec.get(i));
        }
    }
}

Output

date
cherry
banana
apple

Summary

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

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