第八周作业
package wen;
public 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(2, 5);
System.out.println(p1.movePoint(5, 5));
Point p2 = new Point(4, 7);
System.out.println(p2.movePoint(3, 7));
}
}
二、定义一个矩形类Rectangle：（知识点：对象的创建和使用）[必做题]
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.有2个属性：长length、宽width
3.通过构造方法Rectangle(intwidth,intlength)，分别给两个属性赋值
4.创建一个Rectangle对象，并输出相关信息
package wen;
public class Rectangle {
int length,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("长方形的长是"+length+"宽是"+width);
System.out.println("周长是"+ (length+width)*2);
System.out.println("面积是"+length*width);
}
public Rectangle(int length, int width) {
this.length = length;
this.width = width;
}
public static void main(String[] args) {
// TODO Auto-generated method stub
Rectangle r=new Rectangle(10, 10);
r.showAll();
}
}
package wen;
public class Rectangle {
int length,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("长方形的长是"+length+"宽是"+width);
System.out.println("周长是"+ (length+width)*2);
System.out.println("面积是"+length*width);
}
public Rectangle(int length, int width) {
this.length = length;
this.width = width;
}
public static void main(String[] args) {
// TODO Auto-generated method stub
Rectangle r=new Rectangle(10, 10);
r.showAll();
}
}
package wen;
public class computer {
char colour;
int cpu;
public void show() {
System.out.println("我的颜色是：" + colour+"色" + ",型号是：" + cpu);
}
public computer(char colour, int cpu) {
super();
this.colour = colour;
this.cpu = cpu;
}
public computer() {
super();
}
}
package wen;
public class test {
public static void main(String[] args) {
// TODO Auto-generated method stub
computer s1=new computer();
s1.colour='黑';
s1.cpu=121;
s1.show();
computer s2=new computer('蓝',111);
s2.show();
}
}
四、定义两个类，描述如下：[必做题]
1.定义一个人类Person：
(1)定义一个方法sayHello()，可以向对方发出问候语“hello,mynameisXXX”
(2)有三个属性：名字、身高、体重
2.定义一个PersonCreate类：
(1)创建两个对象，分别是zhangsan，33岁，1.73；lishi，44，1.74
(2)分别调用对象的sayHello()方法。
package wen;
public class Person {
String name;
double height;
int weight;
int age;
public void sayhello() {
System.out.println("hello,my name is " + name);
System.out.println("my height is " + height + "米");
System.out.println("my weight is " + weight + "斤");
System.out.println("my age is " + age + "岁");
}
}
package wen;
public class PersonCreate {
public static void main(String[] args) {
// TODO Auto-generated method stub
Person a = new Person();
Person b = new Person();
a.name ="zhangsan";
a.age = 33;
a.height = 1.73;
a.weight = 120;
b.name = "lishi";
b.age = 44;
b.height = 1.74;
b.weight = 140;
a.sayhello();
b.sayhello();
}
}
五、定义两个类，描述如下：[必做题]
1.定义一个人类Person：
（1）定义一个方法sayHello()，可以向对方发出问候语“hello,mynameisXXX”
（2）有三个属性：名字、身高、体重
（3）通过构造方法，分别给三个属性赋值
2.定义一个Constructor类：
（1）创建两个对象，分别是zhangsan，33岁，1.73；lishi，44，1.74
（2）分别调用对象的sayHello()方法。
package wen;
public class Constructor {
String name;
double height;
int weight;
int age;
public Constructor (String name, double height, int weight,int age) {
super();
this.name = name;
this.height = height;
this.weight = weight;
this.age=age;
}
public void sayhello() {
System.out.println("hello,my name is " + name);
System.out.println("my height is " + height + "米");
System.out.println("my weight is " + weight + "千克");
System.out.println("my age is " + age + "岁");
}
}
package wen;
public class sayHello {
public static void main(String[] args) {
// TODO Auto-generated method stub
Constructor a=new Constructor ("zhangsan",1.73,55,33);
Constructor b=new Constructor ("lishi",1.74,54,44);
a.sayhello();
b.sayhello();
}
}
六、定义一个汽车类Vehicle，要求如下：[选做题]
1.属性包括：汽车品牌brand（String类型）、颜色color（String类型）和速度speed（double类型），并且所有属性为私有。
2.至少提供一个有参的构造方法（要求品牌和颜色可以初始化为任意值，但速度的初始值必须为0）。
3.为私有属性提供访问器方法。注意：汽车品牌一旦初始化之后不能修改。
4.定义一个一般方法run()，用打印语句描述汽车奔跑
的功能
5.定义测试类VehicleTest，在其main方法中创建一个品牌为“benz”、颜色为“black”的汽车。
package wen;
public class Vehicle {
private String brand;
private String color;
private double speed;
public Vehicle(String brand,String color){
this.brand=brand;
this.color=color;
}
Vehicle(String brand, String color, double speed) {
super();
this.brand = brand;
this.color = color;
this.speed = speed;
}
public void run(){
System.out.println("这个汽车的品牌为"+this.brand+"这个汽车的颜色为"+this.color+"这个汽车的速度为"+this.speed);
}
}
package wen;
public class VehicleTest {
public static void main(String[] args) {
Vehicle v=new Vehicle("benz","black");
v.run();
Vehicle v1=new Vehicle("benz","black",13);
v1.run();
}
}
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