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How To Reverse A String in Java

Rajkumar
February 19, 2021

In this post, we will see different ways to reverse a string in Java. We can reverse a String in Java using the following ways.

Using StringBuffer Class
Using StringBuilder Class
Using Array List
Convert String into Character Array and use For loop

Let’s see one by one in detail

Reverse String in Java using StringBuffer Class

package softwareTestingMaterial;

public class ReverseString {
	
	public static void main(String[] args) {
	// Using StringBuffer class
	StringBuffer a = new StringBuffer("Software Testing Material");
	// use reverse() method to reverse string
	System.out.println(a.reverse());
	}
	
}

package softwareTestingMaterial;

public class ReverseString {

public static void main(String[] args) {

// Using StringBuffer class

StringBuffer a = new StringBuffer("Software Testing Material");

// use reverse() method to reverse string

System.out.println(a.reverse());

}

Reverse String in Java using StringBuilder Class

package softwareTestingMaterial;

public class ReverseString {
	
	public static void main(String[] args) {
	        String input="Software Testing Material";<br>		StringBuilder input1 = new StringBuilder();<br>		input1.append(input);<br>		input1=input1.reverse(); <br>		for (int i=0;i<input1.length();i++)<br>		System.out.print(input1.charAt(i));
	}
	
}

package softwareTestingMaterial;

public class ReverseString {

public static void main(String[] args) {

String input="Software Testing Material"; StringBuilder input1 = new StringBuilder(); input1.append(input); input1=input1.reverse(); for (int i=0;i<input1.length();i++) System.out.print(input1.charAt(i));

}

Reverse String in Java using Array List Class

public class ReverseString {<br>    public static void main(String[] args) { <br>        String inputValue = "Software Testing Material"; <br>        char[] inputChars = inputValue.toCharArray(); <br>        List<Character> inputList = new ArrayList<>(); <br>        for (char c: inputChars) <br>            inputList.add(c); <br>        Collections.reverse(inputList); <br>        ListIterator li = inputList.listIterator(); <br>        while (li.hasNext()) <br>            System.out.print(li.next()); <br>    } <br>}

public class ReverseString { public static void main(String[] args) { String inputValue = "Software Testing Material"; char[] inputChars = inputValue.toCharArray(); List<Character> inputList = new ArrayList<>(); for (char c: inputChars) inputList.add(c); Collections.reverse(inputList); ListIterator li = inputList.listIterator(); while (li.hasNext()) System.out.print(li.next()); } }

Reverse String in Java by converting String into Character Array and use For loop

package softwareTestingMaterial; 
         public class ReverseString { 
                public static void main(String[] args) { 
                String inputValue = "Software Testing Material";<br>                //convert String into Character array by using to.CharArray<br>                char[] inputChars = inputValue.toCharArray();<br>                int length = inputChars.length;<br>                for (int i = length-1; i >=0; i--) {<br>                         System.out.print(inputChars[i]); 
                } 
         } 
}

package softwareTestingMaterial;

public class ReverseString {

public static void main(String[] args) {

String inputValue = "Software Testing Material"; //convert String into Character array by using to.CharArray char[] inputChars = inputValue.toCharArray(); int length = inputChars.length; for (int i = length-1; i >=0; i--) { System.out.print(inputChars[i]);

}

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Rajkumar SM is a founder of SoftwareTestingMaterial. He is a certified Software Test Engineer by profession and blogger & youtuber by choice. He has an extensive experience in the field of Software Testing. He writes here about Software Testing which includes both Manual and Automation Testing. He loves to be with his wife and cute little kid 'Freedom'.

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