Question

In PHP you can concatenate strings with .= so that the string grows with what ever you add to it. I wonder if this could be done in java? I made some test in this code, to add all number into one long string, but not working! Could it be done in some other way?

int number = 100;
for (int x = number; x <= 2; x--) {

    resultat = resultat + Integer.toString(x);
}

Answer 1

Yes, += in Java is .= in PHP:

result += Integer.toString(x). You just need to define String resultat = "" above the loop. (And as others noted – fix your loop condition, it’s always false)

However, in loops you’d better use a StringBuilder. A String is immutable, so every time you use + a new string is created (which may be inefficient with bigger loops). Instead:

StringBuilder builder = new StringBuilder();
for (...) {
    builder.append(x);
}
String result = builder.toString();