Calling method operates on an object via the reference value : Parameter « Java Source And Data Type « SCJP

1. SCJP
2. Java Source And Data Type
3. Parameter

import java.awt.Button;

public class MainClass {

  public static void main() {
    Button btn = new Button("Pink");
    changeMe(btn);
    System.out.println(btn.getLabel());

  }

  public static void changeMe(Button replaceMe) {
    replaceMe.setLabel("Blue");
    System.out.println(replaceMe.getLabel());
  }

}