JAVA program: implement string reversal

1. Write a JAVA program to display a string in reverse?

To write a Java program to display a string in reverse, you can use the following code example:

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

    private 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();
    }
}

This program defines a reverseString method, which Accepts a string and returns its reverse version. In the main method, we demonstrate how to use this method.

2. String replacement in java How to perform string replacement in ja?

In Java, you can use the replace method to perform string replacement. Here is a simple example:

public class StringReplaceExample {
    public static void main(String[] args) {
        String original = "Java is fun!";
        String replaced = original.replace("fun", "awesome");
        System.out.println("Original String: " + original);
        System.out.println("String after replacement: " + replaced);
    }
}

In the above example, we use the replace method to replace "fun" with "awesome" in the original string. The replaced string is stored in the replaced variable.

Please note that the replace method returns a new string and the original string remains unchanged.

Summary

##1.
1. Reverse string display: Use StringBuilder’s reverse method or construct the reverse string by iteration.
2.
2. String replacement: Use the replace method to perform string replacement. A new string will be created, leaving the original string unchanged.

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