How to reverse String in Java

There are many ways to reverse String in Java. We can reverse String using StringBuffer, StringBuilder, iteration etc. Let's see the ways to reverse String in Java.

1) By StringBuilder / StringBuffer

File: StringFormatter.java

public class StringFormatter {
public static String reverseString(String str){
	StringBuilder sb=new StringBuilder(str);
	sb.reverse();
	return sb.toString();
}
}

File: TestStringFormatter.java

public class TestStringFormatter {
public static void main(String[] args) {
	System.out.println(StringFormatter.reverseString("my name is khan"));
	System.out.println(StringFormatter.reverseString("I am sonoo jaiswal"));	
	}
}

Output:

nahk si eman ym
lawsiaj oonos ma I

2) By Reverse Iteration

File: StringFormatter.java

public class StringFormatter {
public static String reverseString(String str){
	char ch[]=str.toCharArray();
	String rev="";
	for(int i=ch.length-1;i>=0;i--){
		rev+=ch[i];
	}
	return rev;
}
}

File: TestStringFormatter.java

public class TestStringFormatter {
public static void main(String[] args) {
	System.out.println(StringFormatter.reverseString("my name is khan"));
	System.out.println(StringFormatter.reverseString("I am sonoo jaiswal"));	
	}
}

Output: