how to decrypt the encrypted value from Javascript in Java

I encrypt the value in Javascript using this code :

function Encrypt(theText){
    output = new String;
    Temp = new Array();
    Temp2 = new Array();
    TextSize = theText.length;

    for (i = 0; i < TextSize; i++) {
        rnd = Math.round(Math.random() * 122) + 68;
        Temp[i] = theText.charCodeAt(i) + rnd;
        Temp2[i] = rnd;
    }

    for (i = 0; i < TextSize; i++) {
        output += String.fromCharCode(Temp[i], Temp2[i]);
    }

    return output;
}

and I want to decrypt back the value in Java server side.but, I don't know how to convert the decrypt function into Java. I got the decrypt function in Javascript like this :

function Decrypt(theText){
    output = new String;
    Temp = new Array();
    Temp2 = new Array();
    TextSize = theText.length;

    for (i = 0; i < TextSize; i++) {
        Temp[i] = theText.charCodeAt(i);
        Temp2[i] = theText.charCodeAt(i + 1);
    }
   
    for (i = 0; i < TextSize; i = i+2) {
        output += String.fromCharCode(Temp[i] - Temp2[i]);
    }

    return output;
}

can somebody help me to convert it to Java? thanks.