A.paint()
B.paintComponent()
C.repaint()
D.update()
4.在子类之间的语义约束中,表示超类中的对象必须在子类中出现的是()
A.Overlapping B.Complete
C.Disjoint D.Imcomplete
A.s+=x;
B.s+=y;
C.s+=z;
D.s+=b;
写出程序运行结果。
classPoint{
intx,y;
Point(intx,inty){
this.x=x;
this.y=y;
System.out.println("父类构造函数被调用!");
}
}
classCircleextendsPoint{
intradius;
Circle(intr,intx,inty){
super(x,y);
this.radius=r;
System.out.println("子类构造函数被调用!");
}
}
publicclasstestInherence{
publicstaticvoidmain(Stringargs[]){
Circlec1=newCircle(2,2,2);
}
}
运行结果: