️Hollow,各位小伙伴,今天我们要做的是第二十四题。
(1)定义成员变量:长(int height),宽(int width);
(2)定义无参构造方法,带参构造方法;
(3)定义以上成员变量对应的getXxx()/setXxx()方法;以及一个显示所有成员信息的toString()方法;
(4)定义求周长的zhouChang()方法和求面积的area()方法;
(5)定义一个测试类RectangleDemo, 进行测试,分别用无参构造方法和带参构造方法创建对象,计算周长和面积。测试结果如下:
public class Java2{
private int height;
private int width;
public Java2() {//无参构造方法
}
public Java2(int heingt,int width) {//有参构造方法
this.height=heingt;
this.width=width;
}
public int getHeight() {
return height;
}
public void setHeight(int height) {
this.height = height;
}
public int getWidth() {
return width;
}
public void setWidth(int width) {
this.width = width;
}
@Override
public String toString() {
// TODO Auto-generated method stub
return "Rectangle [ width="+width+",height="+height;
}
public int zhouChang() {
return 2*(height+width);
}
public int area() {
return height*width;
}
public static void main(String[] args) {
// 创建无参构造方法的对象
Java2 rectangle1 = new Java2();
rectangle1.setHeight(10);
rectangle1.setWidth(8);
System.out.println(rectangle1.toString());
System.out.println("周长为:" + rectangle1.zhouChang());
System.out.println("面积为:" + rectangle1.area());
// 创建带参构造方法的对象
Java2 rectangle2 = new Java2(12, 9);
System.out.println(rectangle2.toString());
System.out.println("周长为:" + rectangle2.zhouChang());
System.out.println("面积为:" + rectangle2.area());
}
}