Mastering Java Interview Programs

package com.javainfotech;

public class StringReverse {
	
	public static void main(String[] args) {
		//Using StringBuffer
		String res = reverseUsingStringBuffer("JavaInfotech");
		System.out.println("Reverse String - "+res);
		String result = reverseUsingIterate("JavaInfotech");
		System.out.println("Reverse String - "+result);
		String results = reverseUsingRecursive("JavaInfotech");
		System.out.println("Reverse String - "+results);
	}
	
	//Using StringBuffer
	public static String reverseUsingStringBuffer(String str){
		StringBuffer sb = new StringBuffer(str);
		return sb.reverse().toString();
	}
	//Using Iterating 
	public static String reverseUsingIterate(String str){
		char[]  ch = str.toCharArray();
		String s ="";
		for(int i=ch.length-1;i>=0;i--){
			s = s+ch[i];
		}
		return s;
	}
	//Using Recursive
	public static String reverseUsingRecursive(String str){
		if((str==null) || (str.length()<=1)){
			return str;
		}
		return reverseUsingRecursive(str.substring(1))+str.charAt(0);
	}
}