Reverse a string

public class reverse_string {
   
    public static void main(String[] args) {
        String str="nit is a good college in india";
        char arr[]=str.toCharArray();
        int j=arr.length-1;
        int i=0;
        while(i<j){
            char ch=arr[i];
            arr[i]=arr[j];
            arr[j]=ch;
        i++;
        j--;
        }
     for (int k = 0; k < arr.length; k++) {
        System.out.print(arr[k]);   
    }  
       
    }

}

Output:

 aidni ni egelloc doog a si tin

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