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Write code to reverse the given string

File 1: StringRoutines.java
--------------------------------------------------------------
package org.developersbrain.solutions;

public class StringRoutines {

int getArrayLength(char[] arrList){
return arrList.length;
}

String convertArrString(char[] arrList){
int arrLength = getArrayLength(arrList);
String retString="";
for(int i=0;i<arrLength;i++){
retString=retString+arrList[i];
}
return retString;
}

public String reverse(String str){
char[] chrArray=str.toCharArray();
int arrLength=getArrayLength(chrArray);
char tmp;
for(int i=0,j=arrLength-1;i<arrLength/2;i++,j--){
tmp=chrArray[j];
chrArray[j]=chrArray[i];
chrArray[i]=tmp;
}

return convertArrString(chrArray);
}

}

File2: MainClass.java
------------------------------------------------------------------

package org.developersbrain.solutions;

public class MainClass {
public static void main(String[] args){
StringRoutines sr=new StringRoutines();
String str="ABCDEFGHIJKLMNOP";
System.out.println("Given String:"+str);
System.out.println("Modifed String:"+sr.reverse(str));
}
}

Ouput:
--------------------------------------------------------------------------------
Given String:ABCDEFGHIJKLMNOP
Modifed String:PONMLKJIHGFEDCBA

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