一、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(intdx,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p1和p2的坐标。[必作题]
package abc;
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) {
// TODO Auto-generated method stub
Point p1 = new Point(5,8);
System.out.println(p1.movePoint(6, 9));
Point p2 = new Point(2, 3);
System.out.println(p2.movePoint(5, 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 abc;
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(15, 10);
r.showAll();
}
}
三、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]
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;
2.输出笔记本信息的方法
3.然后编写一个测试类,测试笔记本类的各个方法。
package abc;
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();
}
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 abc;
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");
}
public static void main(String[] args) {
// TODO Auto-generated method stub
Person a = new Person();
Person b = new Person();
a.name ="zhangsan";
a.age = 21;
a.height = 1.70;
a.weight = 130;
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 abc;
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");
}
public static void main(String[] args) {
// TODO Auto-generated method stub
Constructor a=new Constructor ("zhangsan",1.70,55,73);
Constructor b=new Constructor ("lishi",1.76,54,74);
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 abc;
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);
}
public static void main(String[] args) {
Vehicle v=new Vehicle("benz","red");
v.run();
Vehicle v1=new Vehicle("benz","black",13);
v1.run();
}
}