How to reverse a string in java

Question

I have "I am a student" kept in a String variable named Hello.

I need to print it in a reversed manner.

How to do that?

Answer 1

You can use this:

new StringBuilder(Hello).reverse().toString()

Answer 2

Instead of using StringBuffer and StringBuilder, you can use char[].

public static String reverse(String input){
    char[] in = input.toCharArray();
    int begin=0;
    int end=in.length-1;
    char temp;
    while(end>begin){
        temp = in[begin];
        in[begin]=in[end];
        in[end] = temp;
        end--;
        begin++;
    }
    return new String(in);
}

Answer 3

public static String reverse(String s) {
    if (s == null) {
        return "";
    }
    if (s.isEmpty()) {
        return "";
    }
    return reverse(s.substring(1)) + s.charAt(0);
}