第九周上机

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(int x0,y0),以及一个movePoint（int dx,int dy）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p1和p2的坐标。[必作题]

package demo9_1ninthweek_Thursday;
 
public class point_func {
    int x;
 
    int y;
 
    public point_func() {
 
    }
 
    public point_func(int x0, int y0) {
        this.x = x0;
        this.y = y0;
    }
 
    public void movePoint(int dx, int dy) {
        this.x += dx;
        this.y += dy;
    }
 
}

package demo9_1ninthweek_Thursday;
 
public class point_test {
 
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        point_func p1 = new point_func(2, 2);
        p1.movePoint(6, 7);
        System.out.println("p1当前的坐标为：" + p1.x + "," + p1.y);
        point_func p2 = new point_func();
        p2.movePoint(6, 7);
        System.out.println("p2当前的坐标为：" + p2.x + "," + p2.y);
    }
 
}

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、getPer()求周长，showAll()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 创建一个Rectangle对象，并输出相关信息

package demo9_1ninthweek_Thursday;
 
public class Rectangle_func {
    private int length;
    private int width;
 
    Rectangle_func(int length, int width) {
        this.length = length;
        this.width = width;
    }
 
    public void showAll() {
        System.out.println("矩形长为:" + length + "	" + "矩形的宽为:" + width);
        System.out.println("矩形的面积为:" + getArea() + "	" + "矩形的周长为:" + getPer());
    }
 
    public int getPer() {
        return 2 * (length + width);
    }
 
    public int getArea() {
        return length * width;
    }
 
}

package demo9_1ninthweek_Thursday;
 
public class Rectangle_test {
 
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Rectangle_func r = new Rectangle_func(4, 6);
        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 demo9_1ninthweek_Thursday;
 
public class computer_func {
    char color;
    int model;
 
    computer_func() {
 
    }
 
    computer_func(char color, int model) {
        this.color = color;
        this.model = model;
    }
 
    void a() {
        System.out.println("笔记本的颜色为：" + color + "  型号为：" + model);
    }
 
    public static void main(String[] args) {
        computer_func a = new computer_func('a', 1999);
        a.a();
    }
 
}

4、定义两个类，描述如下： [必做题]
• 4.1定义一个人类Person：
• 4.1.1定义一个方法sayHello()，可以向对方发出问候语“hello,my name is XXX”
• 4.1.2有三个属性：名字、身高、年龄
• 4.1.3通过构造方法，分别给三个属性赋值
• 4.2定义一个Constructor类：
• 4.2.1创建两个对象，分别是zhangsan，33岁，1.73；lishi，44，1.74
• 4.2.2分别调用对象的sayHello()方法。

package demo9_1ninthweek_Thursday;
 
public class Person {
    String name;
    int age;
    double height;
 
    public void sayHello() {
        System.out.println("hello,my name is " + this.name);
    }
 
    public void getValue(String name, int age, double height) {
        this.name = name;
        this.age = age;
        this.height = height;
    }
 
}

package demo9_1ninthweek_Thursday;
 
public class person_test {
 
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Person p1 = new Person();
        p1.getValue("zhangsan", 33, 1.74);
        p1.sayHello();
        Person p2 = new Person();
        p2.getValue("lishi", 44, 1.74);
        p2.sayHello();
 
    }
 
}