How to Sort a Vector in Descending Order in Java - Step by Step Examples

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How to Sort a Vector in Descending Order in Java ?

Answer

To sort a Vector in descending order in Java, you can use the Collections.sort method with a custom Comparator.

✐ Examples

1 Sort a Numeric Vector in Descending Order

In this example,

We import the necessary classes: java.util.Vector and java.util.Collections.
We create a Vector named vec containing several numeric values.
We define a custom Comparator that compares elements in reverse order.
We call the Collections.sort method, passing the Vector and the custom Comparator as arguments. This method sorts the elements of the Vector in descending order.
Finally, we print the sorted Vector to standard output.

Java Program

import java.util.Vector;
import java.util.Collections;
import java.util.Comparator;

public class Main {
    public static void main(String[] args) {
        // Step 1: Create a Vector
        Vector<Integer> vec = new Vector<>();
        vec.add(5);
        vec.add(2);
        vec.add(8);
        vec.add(3);
        vec.add(9);
        vec.add(1);
        
        // Step 2: Define a custom Comparator
        Comparator<Integer> comparator = Collections.reverseOrder();
        
        // Step 3: Sort the Vector in descending order
        Collections.sort(vec, comparator);
        
        // Step 4: Print the sorted Vector
        System.out.print("Sorted Vector: ");
        for (int num : vec) {
            System.out.print(num + " ");
        }
        System.out.println();
    }
}

Output

Sorted Vector: 9 8 5 3 2 1

2 Sort a String Vector in Descending Order

In this example,

We import the necessary classes: java.util.Vector and java.util.Collections.
We create a Vector named vec containing several string values.
We define a custom Comparator that compares elements in reverse order based on lexicographic order.
We call the Collections.sort method, passing the Vector and the custom Comparator as arguments. This method sorts the elements of the Vector in descending order based on lexicographic order.
Finally, we print the sorted Vector to standard output.

Java Program

import java.util.Vector;
import java.util.Collections;
import java.util.Comparator;

public class Main {
    public static void main(String[] args) {
        // Step 1: Create a Vector
        Vector<String> vec = new Vector<>();
        vec.add("apple");
        vec.add("banana");
        vec.add("orange");
        vec.add("grape");
        vec.add("kiwi");
        
        // Step 2: Define a custom Comparator
        Comparator<String> comparator = Collections.reverseOrder();
        
        // Step 3: Sort the Vector in descending order
        Collections.sort(vec, comparator);
        
        // Step 4: Print the sorted Vector
        System.out.print("Sorted Vector: ");
        for (String str : vec) {
            System.out.print(str + " ");
        }
        System.out.println();
    }
}

Output

Sorted Vector: orange kiwi grape banana apple

Summary

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

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How to Sort a Vector in Descending Order in Java - Step by Step Examples

How to Sort a Vector in Descending Order in Java ?

Answer

✐ Examples

1 Sort a Numeric Vector in Descending Order

Java Program

Output

2 Sort a String Vector in Descending Order

Java Program

Output

Summary

More Java Vectors Tutorials