A static method must specify which instance of its class owns the variable or executes the method. : static « Modifiers « SCJP

1. SCJP
2. Modifiers
3. static

class Rectangle {
  int w = 0;

  int h = 0;

  Rectangle() {
    setSize(300, 300);
  }

  public void setSize(int width, int height) {
    this.w = width;
    this.h = height;
  }

}

public class MainClass {
  public static void main(String args[]) {
    Rectangle rect = new Rectangle();
    rect.setSize(1, 1);
  }
}