unexpected type error

Question

I'm new at Java, I study on strings and i want a string to be reversed. Here is my code

String myStr = "abcdef"; String reversed = "";
for(int j=myStr.length()-1;j>=0;j--) {
    myStr.charAt(j) += reversed;
}

But it gives me an error message:

****.java:14: error: unexpected type
required: variable
found:    value

But when I print it by System.out.print(reversed), it prints reversed correctly. What is the difference between variable and value? Why it can give me correct answer in spite of giving me an error message? I'll appreciate your answers, thanks

Answer 1

The problem is here:

myStr.charAt(j) += reversed;

The left-hand-side is a value. Not a variable. That's why you can't to a += to it.

---

Although it defeats the purpose of learning how do it the hard way, you can do it like this:

myStr = new StringBuffer(myStr).reverse().toString();

Answer 2

it sould be reversed += new String(myStr.charAt(j)); ... the unexpected type is that what charAt(j) returns