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 wjb;

public class Point {
    int x;
    int y;
    public Point(){
    }
    public Point(int x0,int y0){
        this.x=x0;
        this.y=y0;
    }
    public void movePoint(int dx,int dy){
        System.out.println("移动前的坐标为:"+x+","+y);
        System.out.println("移动的量:"+dx+" "+dy);
        this.x +=dx;
        this.y +=dy;
        System.out.println("移动后的坐标为:"+this.x+","+this.y);
    }

}
package wjb;
import java.util.*;
import java.util.Random;
public class wjb {

     public static void main(String[] args) {
         Point p1=new Point(1,1);
         Point p2=new Point(5,9);
         p1.movePoint(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 wjb;

public class Rectangle {
    int length;
    int width;
    
    public Rectangle(int length,int width){
        this.length=length;
        this.width=width;
    }
    public int getArea(int length,int width){
        return this.length*this.width;
    }
    public int getPer(int length,int width){
        return (this.length+this.width)*2;
    }
    public void showAll(int length,int width){
        System.out.println("长是:"+length+"宽是:"+width);
        System.out.println("面积是:"+getArea(length,width));
        System.out.println("周长是:"+getPer(length,width));
    }
}
package wjb;
import java.util.*;
import java.util.Random;
public class wjb {

     public static void main(String[] args) {
         Rectangle r=new Rectangle(1,2);
         r.showAll(r.length, r.width);
     }
}

 

 

• 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 wjb;

public class Rectangle {
    private char color;
    private int cpu;
    
    public Rectangle(){
        
    }
    public Rectangle(char color,int cpu){
        this.color=color;
        this.cpu=cpu;
    }
    
    public char getColor(){
        return color;
    }
    public int getCpu(){
        return cpu;
    }
    
    public void setColor(char color){
        this.color=color;
    }
    public void setCpu(int cpu){
        this.cpu=cpu;
    }
    public void show(){
        System.out.println("笔记本的颜色是:"+getColor());
        System.out.println("笔记本的cpu是:"+getCpu());
    }
}
package wjb;
import java.util.*;
import java.util.Random;
public class wjb {

     public static void main(String[] args) {
        Rectangle n=new Rectangle('黑',25);
        n.show();
            
        Rectangle n2=new Rectangle('红',50);
        n2.show();    
     }
}                

 

 

6、定义两个类,描述如下: [必做题]
• 6.1定义一个人类Person:
• 6.1.1定义一个方法sayHello(),可以向对方发出
问候语“hello,my name is XXX”
• 6.1.2有三个属性:名字、身高、年龄
• 6.1.3通过构造方法,分别给三个属性赋值
• 6.2定义一个Constructor类:
• 6.2.1创建两个对象,分别是zhangsan,33岁,
1.73;lishi,44,1.74
• 6.2.2分别调用对象的sayHello()方法。

package wjb;

public class Person {
    private String name;
    private double hight;
    private double weight;
    
    public Person(String name,double hight,double weight){
        this.name=name;
        this.hight=hight;
        this.weight=weight;
    }
    public String getName(){
        return name;
    }
    public double gethight(){
        return hight;
    }
    public double getwight(){
        return weight;
    }
    
    public void setName(String name){
        this.name=name;
    }
    public void setHight(double hight){
        this.hight=hight;
    }
    public void getWeight(double weight){
        this.weight=weight;
    }
    public void sayHello(){
        System.out.println("hello!my name is "+name);
    }
}
package wjb;
import java.util.*;
import java.util.Random;
public class wjb {

     public static void main(String[] args) {
         Person p1=new Person("zhangsan",33,1.73);
         Person p2=new Person("lisi",44,1.74);
         p1.sayHello();
         p2.sayHello();
     }
}

 

posted @ 2020-04-30 14:50  蔚丶然  阅读(184)  评论(0编辑  收藏  举报