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。
package sasd;
public class acall {
private int x;
private int y;
Point(){
}
public Point(int x, int y) {
this.x = x;
this.y = y;
}
public int getX() {
return x;
}
public void setX(int x) {
this.x = x;
}
public int getY() {
return y;
}
public void setY(int y) {
this.y = y;
}
public void movePoint(int dx,int dy) {
x+=dx;
y+=dy;
}
}
package aaa;
public class use {
public static void main(String[] args) {
Point p1=new Point(9,5);
p1.movePoint(5, 6);
Point p2=new Point(8,4);
p2.movePoint(9,5);
System.out.println("p1点是("+p1.getX()+","+p1.getY()+")");
System.out.println("p2点是("+p2.getX()+","+p2.getY()+")");
}
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 sasd;
public class acall {
private int width;
private int length;
public Rectangle(int width, int length) {
this.width = width;
this.length = length;
}
public int getWidth() {
return width;
}
public void setWidth(int width) {
this.width = width;
}
public int getLength() {
return length;
}
public void setLength(int length) {
this.length = length;
}
public int getArea() {
return this.width*this.length;
}
public int getPer() {
return this.width*2+this.length*2;
}
public void showAll() {
System.out.println("长是"+this.length+"宽是"+this.width);
System.out.println("面积是"+this.getArea()+"周长是"+this.getPer());
}
}
package aaa;
public class use {
public static void main(String[] args) {
Rectangle r=new Rectangle(3,6);
r.showAll();
}
}
、
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 sasd;
public class acall {
private char color;
private int cpu;
public char getColor() {
return color;
}
public void setColor(char color) {
this.color = color;
}
public int getCpu() {
return cpu;
}
public void setCpu(int cpu) {
this.cpu = cpu;
}
public com(char color, int cpu) {
super();
this.color = color;
this.cpu = cpu;
}
public com() {
super();
}
public void shu() {
System.out.println("笔记本型号"+cpu+"颜色"+color);
}
}
package aaa;
public class use {
public static void main(String[] args) {
com c=new com();
com c1=new com('蓝',4080);
c1.shu();
}
}
定义两个类，描述如下： [必做题] • 5.1定义一个人类Person： • 5.1.1定义一个方法sayHello()，可以向对方发出问 候语“hello,my name is XXX” • 5.1.2有三个属性：名字、身高、体重 • 5.2定义一个PersonCreate类： • 5.2.1创建两个对象，分别是zhangsan，33岁，1.73 ；lishi，44，1.74 • 5.2.2分别调用对象的sayHello()方法。
package sasd;
public class acall {
public static void main(String[] args) {
Person p1=new Person();
p1.setName("zhangsan");
p1.setWeight(33);
p1.setHeight(1.73);
Person p2=new Person();
p2.setName("lisi");
p2.setWeight(44);
p2.setHeight(1.74);
p1.sayHello();
p2.sayHello();
}
}
package case1;
public class Person {
private String name;
private double height;
private double weight;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getHeight() {
return height;
}
public void setHeight(double height) {
this.height = height;
}
public double getWeight() {
return weight;
}
public void setWeight(double weight) {
this.weight = weight;
}
public Person(String name, double height, double weight) {
super();
this.name = name;
this.height = height;
this.weight = weight;
}
public Person() {
super();
}
public void sayHello() {
System.out.println("hello my name is "+getName());
}
}
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、体重 • 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 sasd;
public class acall {
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();
}
}
package case1;
public class Person {
private String name;
private double height;
private double weight;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getHeight() {
return height;
}
public void setHeight(double height) {
this.height = height;
}
public double getWeight() {
return weight;
}
public void setWeight(double weight) {
this.weight = weight;
}
public Person(String name, double height, double weight) {
super();
this.name = name;
this.height = height;
this.weight = weight;
}
public Person() {
super();
}
public void sayHello() {
System.out.println("hello my name is "+getName());
}
}
定义一个汽车类Vehicle，要求如下：[选做题] • 7.1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。 • 7.2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）。 • 7.3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。 • 7.4定义一个一般方法run()，用打印语句描述汽车奔跑 的功能 • 7.5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 sasd;
public class acall {
public static void main(String[] args) {
Vehicle v=new Vehicle("benz","black",60);
v.run();
}
}
package case1;
public class Vehicle {
private String brand;
private String color;
private double speed;
public String getBrand() {
return brand;
}
public String getColor() {
return color;
}
public void setColor(String color) {
this.color = color;
}
public double getSpeed() {
return speed;
}
public void setSpeed(double speed) {
this.speed = speed;
}
public Vehicle() {
super();
}
public Vehicle(String brand, String color, double speed) {
super();
this.brand = brand;
this.color = color;
this.speed = 0;
}
public void run(){
System.out.println(brand+"的"+color+"的汽车以"+speed+"的速度在行驶");
}
}
