Question

let’s say that I want to create a new string during a “for” loop,

The new string will be a change of an exsist string that will be change depanding a conditions and positions of the loop.

How can I insert to an exist string new chars?

I went through the whole method summary that relates to strings and didn’t get my answer there.

Edit: Originaly I posted a java 4 link of methods by mistake. I use the newest version of java.

Thank you

Answer 1

Either use a StringBuilder or String.concat(String)

Example:

StringBuilder sb = new StringBuilder();
Iterator<Integer> iterator =
    Arrays.asList(1, 2, 3, 4, 5, 6, 7).iterator();
if(iterator.hasNext()){
    sb.append(iterator.next());
    while(iterator.hasNext()){
        sb.append(',').append(iterator.next());
    }
}
final String joined = sb.toString();

---

And about googling javadocs: Google will almost always return ancient 1.4 versions. if you search for keywords like the classname alone. Search for classname /6, e.g. StringBuilder /6 and you will get the current version.