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Java Program to Reverse a String
In this article, we will understand how to reverse a string. String is a datatype that contains one or more characters and is enclosed in double quotes(“ ”). Reverse string is displaying the string backwards or from right to left.
Below is a demonstration of the same −
Suppose our input is −
The string is defined as: Java Program
The desired output would be −
The reversed string is: margorP avaJ
Algorithm
Step 1 - START Step 2 - Declare two string values namely input_string and reverse_string, and a char value namely temp. Step 3 - Define the values. Step 4 - Iterating using a for-loop, assign the i’th character to temp and later assign the ‘temp + reverse_string’ to reverse_string value. I.e adding the first element of the string to the last position of the reverse_string. Store the value. Step 5 - Display the result Step 6 - Stop
Example 1
Here, we bind all the operations together under the ‘main’ function.
public class ReverseString {
public static void main (String[] args) {
String input_string= "Java Program", reverse_string="";
char temp;
System.out.println("The string is defined as: " + input_string);
for (int i=0; i<input_string.length(); i++) {
temp= input_string.charAt(i);
reverse_string= temp+reverse_string;
}
System.out.println("\nThe reversed string is: "+ reverse_string);
}
}Output
The string is defined as: Java Program The reversed string is: margorP avaJ
Example 2
Here, we encapsulate the operations into functions exhibiting object-oriented programming.
public class ReverseString {
static void reverse(String input_string){
String reverse_string = "";
char temp;
for (int i=0; i<input_string.length(); i++) {
temp= input_string.charAt(i);
reverse_string= temp+reverse_string;
}
System.out.println("\nThe reversed string is: "+ reverse_string);
}
public static void main (String[] args) {
String input_string= "Java Program";
System.out.println("The string is defined as: " + input_string);
reverse(input_string);
}
}Output
The string is defined as: Java Program The reversed string is: margorP avaJ
Updated on: 29-Mar-2022
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