Question

java面向对象程序设计 1.按以下要求编写程序(1) 创建一个Rectangle类,添加width和height两个成员变量(2).

java面向对象程序设计1.按以下要求编写程序(1) 创建一个Rectangle类，添加width和height两个成员变量(2) 在Rectangle中添加两种方法分别计算矩形的周长和面积(3) 编程利用Rectangle输出一个矩形的周长和面积

Answer 1

class Rectangle {

private double width;

private double height;

public Rectangle(double width, double height) {

this.width = width;

this.height = height;

}

public double getWidth() {

return width;

}

public void setWidth(double width) {

this.width = width;

}

public double getHeight() {

return height;

}

public void setHeight(double height) {

this.height = height;

}

public double getArea() {

return width * height;

}

public double getPerimeter() {

return (width + height) * 2;

}

}

public class App {

public static void main(String[] args) {

Rectangle rect = new Rectangle(50, 20);

System.out.println("矩形，面积：" + rect.getArea() + "，周长：" + rect.getPerimeter());

}

}

Answer 2

public class Rectangle {
float width, height;
public Rectangle(float width, float height) {
this.width = width;
this.height = height;
}
public float getLength______{
return (this.width + this.height) * B;
}
public float getArea______{
return this.width * this.height;
}
public static void main(String [] args) {
Rectangle rect = new Rectangle(A0, B0);
System.out.println("周长是：" + rect.getLength______);
System.out.println("面积是：" + rect.getArea______);
}
}