java-program Archives

Leap Year Program in Java

July 8, 2023July 8, 2023 by manish

A Leap Year is a year that has 366 days. This year February is of 29 days. Leap years occur in every four years. A leap year has the following constraints. We can check Leap Year Program in Java as below A year is divisible by 400 then it is a leap year A year … Read more

Java program to swap two numbers

February 14, 2023February 14, 2023 by manish

Java program to swap two numbers is a very basic example and can be used in any programming language. This is a beginner-level question for all programmers. Here different ways are given for swapping two numbers. All below java programs shows only method to implement this. Swapping of two numbers can be done in any … Read more

String reverse program in java

September 16, 2023January 20, 2023 by manish

In Java, you can reverse a string in several ways. Here are three common methods to reverse a string: String reverse program in java using StringBuilder

public class StringReverseExample {
    public static void main(String[] args) {
        String original = "Hello, World!";
        StringBuilder reversed = new StringBuilder(original).reverse();
        String reversedString = reversed.toString();
        System.out.println("Reversed string: " + reversedString);
    }
}

public class StringReverseExample {

public static void main(String[] args) {

String original = "Hello, World!";

StringBuilder reversed = new StringBuilder(original).reverse();

String reversedString = reversed.toString();

System.out.println("Reversed string: " + reversedString);

}

This program uses the StringBuilder class, which is a mutable sequence of characters. Here’s how it works: Using a loop to reverse the string character by character:

public class StringReverseExample {
    public static void main(String[] args) {
        String original = "Hello, World!";
        String reversed = reverseString(original);
        System.out.println("Reversed string: " + reversed);
    }

    public static String reverseString(String str) {
        StringBuilder reversed = new StringBuilder();
        for (int i = str.length() - 1; i >= 0; i--) {
            reversed.append(str.charAt(i));
        }
        return reversed.toString();
    }
}

public class StringReverseExample {

public static void main(String[] args) {

String original = "Hello, World!";

String reversed = reverseString(original);

System.out.println("Reversed string: " + reversed);

}

public static String reverseString(String str) {

StringBuilder reversed = new StringBuilder();

for (int i = str.length() - 1; i >= 0; i--) {

reversed.append(str.charAt(i));

}

return reversed.toString();

}