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Write a program to reverse a string without using String reverse built-in Function ?

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import java.io.*;
import java.util.Arrays;
public class reverseanarray
{
public static void main(String a[])throws IOException
{
System.out.println("Welcome to the reverseanarray project!");
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String str = br.readLine();
char [] chars1 = str.toCharArray();

int length = str.length();
int temp=length;
char [] chars2=new char[length];

int i=0;
for(i=0;i<temp;i++){
   chars2[i]=chars1[length-1];
   length--;
}

String new1 = new String(chars2);

System.out.println("Reverse of "+str+" is "+new1);
}

}

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