第十二周作业

1、定义一个点类Point， 包含2个成员变量x、y分别表示x和y坐标，2个构造器Point()和Point( intx0,y0),以及一个movePoint (int dx,intdy)方法实现点的位置移动，创建两个Point对象p1、p2， 分别调用movePoint方法后，打印pl和p2的坐标。[必作题]

package qwe.nn;

public class Text1111 {
	public static class Point {

		int x;
		int y;

		public Point(int x0, int y0) {
			super();
			this.x = x0;
			this.y = y0;
		}

		public Point() {
			super();
		}

		public String movePoint(int dx, int dy) {
			x = dx + x;
			y = dy + y;
			return ("x为" + x + ",y为" + y);
		}

		public static void main(String[] args) {
			Point p1 = new Point(1, 2);
			System.out.println(p1.movePoint(4, 3));
			Point p2 = new Point(2, 3);
			System.out.println(p2.movePoint(4, 5));

		}
	}
}

　　

 

 

2.、定义一个矩形类Rectangle: (知识点: 对象的创建和使用)[必做题]
2.1 定义三个方法: getArea(求面积、getPer0求周长，showAll0分 别在控制台输出长、宽、面积周长。
2.2 有2个属性:长length、 宽width
2.3 通过构造方法Rectangle(int width, int length),分别给两个属性赋值
2.4 创建-个Rectangle对象， 并输出相关信息

package qwe.nn;

public class Rectangle {
	int length;
	int width;

	public int getArea(int length, int width) {
		return length * width;
	}

	public int getPer(int length, int width) {
		return (length + width) * 2;
	}

	public void showAll() {
		System.out.println("长方形的长为" + length + ",宽为" + width + ",周长为"
				+ (length + width) * 2 + ",面积为" + length * width);
	}

	public Rectangle(int length, int width) {
		super();
		this.length = length;
		this.width = width;

	}

	public static void main(String[] args) {
		Rectangle r = new Rectangle(4, 7);
		r.showAll();

	}

}

　　

 

 

3、定义一-个笔记本类，该类有颜色(char) 和cpu型号(int) 两个属性。[必做题]
3.1无参和有参的两个构造方法;有参构造方法可以在创建对象的同时为每个属性赋值;
3.2 输出笔记本信息的方法
3.3 然后编写一-个测试类，测试笔记本类的各个方法。

package qwe.nn;


public class Computer {
    char coulour;
    int cpu;
    
    public void show(){
        System.out.println("笔记本颜色是"+coulour+"色"+",型号是"+cpu);
    }
    
    public Computer(char coulour,int cpu){
        super();
        this.coulour=coulour;
        this.cpu=cpu;
    }
      public Computer(){
          super();
      }
}

package qwe.nn;

public class com {
	public static class Test {

		/**
		 * @param args
		 */
		public static void main(String[] args) {
			// TODO Auto-generated method stub
			Computer c = new Computer();
			c.coulour = '黑';
			c.cpu = 123;
			c.show();
			Computer c1 = new Computer('白', 456);
			c1.show();

		}

	}

}