Created attachment 144715 [details]
Before / After

1. Create java class

package test;

public class Test {

    public void loop(int a) {
        String s = "";
        while (--a > 0) {
            //6
            if (a % 3 != 0) {
                s = s + "--, ";
                continue;
            }
            //7
            System.out.println(s + a + ", ");
            return;
            //8
        }
        if (s.endsWith(", ")) {
            s = s.substring(0, s.length() - 2);
        }
        System.out.println(s);
        return;
    }
}

2. Mark code between //7 and //8

3. From main menu: Refactor -> Introduce Method

4. Type any appropriate name and press Refactor

>> It generates method with unnecessary return statement (see attached image)

Product Version: NetBeans IDE Dev (Build 201402030001)
Java: 1.8.0; Java HotSpot(TM) 64-Bit Server VM 25.0-b67
Runtime: Java(TM) SE Runtime Environment 1.8.0-b126
System: Linux version 3.8.0-19-generic running on amd64; UTF-8; en_US (nb)