addcommand.java

面向对象的设计思想

public class AddCommand extends Command {
	int x1,y1,x2,y2;

 public AddCommand(int x1,int y1,int x2,int y2) {
   this.x1= x1;
   this.y2= y2;
   this.y1= y1;
   this.x2= x2;
  }

  public void execute(DrawModel draw) {
    try {
    	  	result=draw.add(x1,y1,x2,y2);
    	  	
    }
    catch (Exception ex) {
      this.excep = ex;
    }
  }
}