java小练笔

class Square{
    private double side;
    public void setSide(double a){
        side= a;
    }
    public double getSide(){
        return side;
    }
    public double setPerimeter(){
        return 4*side;
    }
    public double getArea(){
        return side*side;
    }
}
public class SquareTest {
    public static void main(String[] args){
        Square object1,object2;
        object1 =new Square();
        object2 =new Square();
        object1.setSide(1);
        object2.setSide(10);
        System.out.println("object1 side="+object1.getSide());
        System.out.println("object1 Perimeter="+object1.setPerimeter());
        System.out.println("object1 Area="+object1.getArea());
        System.out.println("object2 side="+object2.getSide());
        System.out.println("object2 Perimeter="+object2.setPerimeter());
        System.out.println("object2 Area="+object2.getArea());

    }
}

这段代码主要是编写一个可以计算正方形周长和面积的程序，在Square类中定义4个成员方法，并在SquareTest类中调用这些方法。通过两个变量调用Setside方法来设置边长，最后打印出最后的结果。