Question

声明一个矩形类Reosrn，其中有多少构造方法。用不同的构造方法创建对象，并输出矩形的周长和面积

Answer 1

public class Reosrn {

private int x = 0;
private int y = 0;

public Reosrn() {
}

public Reosrn(int x) {
this.y = x;
}

public Reosrn(int x, int y) {
this.x = x;
this.y = y;
}
//周长

public int getZC() {
return 2 * (x + y);
}
//面积

public int getMJ() {
return x * y;
}

public static void main(String[] args) {
Reosrn r1 = new Reosrn();
System.out.println("r1周长" + r1.getZC());
System.out.println("r1面积" + r1.getMJ());
Reosrn r2 = new Reosrn(5);
System.out.println("r2周长" + r2.getZC());
System.out.println("r2面积" + r2.getMJ());
Reosrn r3 = new Reosrn(5, 4);
System.out.println("r3周长" + r3.getZC());
System.out.println("r3面积" + r3.getMJ());
}
}