Java program to reverse a String without using predefined methods

import java.util.Arrays;
import java.util.Scanner;

public class StringReverse {

	public static void main(String[] args) {
		
		String str;
		
		//taking string
		Scanner sc=new Scanner(System.in);
		System.out.println("Enter the String :");
		str=sc.nextLine();
	
		//calling method
		strReverse(str);
	}

	private static void strReverse(String str) {
		
		//converting string to character
		char ch[]=str.toCharArray();
		char reverse[]=new char[ch.length];
				
		//logic for reverse a string
		for(int i=0;i<(ch.length);i++)
		{
			reverse[i]=ch[ch.length-i-1];
		}
				
		//printing the reversed string
		System.out.println("Reversed String :");
		System.out.println(new String(reverse));
		
	}
}