How to Reverse a String in Java

Reverse a String in Java

1. Using toCharArray():

public static String reverse(String str) 
{
    String rev="";
    char[] finalarray = str.toCharArray();
    for (int i = finalarray.length - 1; i >= 0; i--)
        rev+=finalarray[i];
    return rev;
}
//Sample Input- "Scaler Academy"
//Sample Output-"ymedacA relacS"


2. using StringBuilder:

public String reverse(String str) 
{
    StringBuilder obj = new StringBuilder();
    //append is inbuilt method to append the data
    obj.append(str);
    obj.reverse();
    return obj.toString();
}
//Sample Input- "Scaler Academy"
//Sample Output-"ymedacA relacS"

3. StringBuffer class

StringBuffer sbf = new StringBuffer("MyJava");
System.out.println(sbf.reverse());    //Output : avaJyM

4. iterative method

String str = "MyJava";
char[] strArray = str.toCharArray();
for (int i = strArray.length - 1; i >= 0; i--)
{
	System.out.print(strArray[i]);     //Output : avaJyM
}

Reverse a String in Java is one of the most frequently asked java programs in the technical round of java fresher’s interview. There are different ways to reverse a string, using in-built methods, using recursion, etc.

If you wanted to know all the different methods on how can you reverse a string read this article on Scaler Topics.