}
}
}
小练习：求矩形的面积和周长
[java]
class Rectangle{
int height;
int length;
Rectangle(){
}
Rectangle(int height,int length){
this.height=height;
this.length=length;
}
int perimeter(){
return 2*(height+length);
int area(){
return height*length;
}
public static void main(String[] args){
Rectangle rec1=new Rectangle();//默认构造方法
System.out.println("perimeter = "+rec1.perimeter());
System.out.println("area = "+rec1.area());
Rectangle rec2=new Rectangle(3,5);//带参数构造方法
System.out.println("perimeter = "+rec2.perimeter());
System.out.println("area = "+rec2.area());
}
}
摘自 Dreamer Thinker Doer