Saturday, December 8, 2012
How to reverse String in Java with or without StringBuffer Example
Reverse String in Java
There are many ways to reverse String in Java. You can use rich Java API to quickly reverse contents of any String object. Java library provides StringBuffer and StringBuilder class with reverse() method which can be used to reverse String in Java. Since converting between String and StringBuffer or StringBuilder is very easy it's the most easy way available to reverse String in Java. At the same time Writing Java program to reverse String in Java without StringBuffer is one of the popular Java String interview question, which requires you to reverse String by applying logic and by not using API methods. Since reverse is a recursive job, you can use recursion as well as loop to reverse String in Java. In this Java tutorial I have shown How to reverse String using StringBuffer, StringBuilder and using pure loop with logic. You can also check How to reverse String with recursion in Java, if you want to see recursive code. let's see complete Java program for this beautiful Java programming exercise.
Here is my complete code program to reverse any String in Java. In main method we have first used StringBuffer and StringBuilder to reverse contents of String and then we wrote our own logic to reverse String. This uses toCharArray() method of String class which return character array of String. By looping through character array and appending it into empty String we can get reversed String in Java, as shown in following example.
That's all on How to reverse String in Java with and without StringBuffer and StringBuilder. Though being a Java programmer I prefer to use library and suggest any one to use StringBuffer or StringBuilder to reverse String for any production use. Though its also a good programming exercise and you should practice it before going for any Java programming interview.
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