import java.awt.Graphics;

public class test1 extends java.applet.Applet {
    //@Override
 private String str;
 private String str2;
 public test1()
 {
  str = "come on";
  str2 = " my friend";
 }
 public void init()
 {
  str.concat(str2);
 }

    public void paint(Graphics g) {

        g.drawString("Hello from java!", 60, 30);
        g.drawString(str, 100, 100);
    }
}

How come str should be "come on my friend" instead of just "come on"? but
the applet just displayed "come on" without "my friend", so what happened?
Thanks
Jack