- 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 xingqiwuDemo;
public class Point {
int x;
int y;
public void Point() {
}
public Point(int x0, int y0) {
super();
this.x = x0;
this.y = y0;
}
public void movePoint(int dx,int dy) {
this.x+=dx;
this.y+=dy;
}
}
package xingqiwuDemo;
public class PointText {
public static void main(String[] args) {
// TODO Auto-generated method stub
Point P1=new Point(4, 5);
Point P2=new Point(-1, 2);
P1.movePoint(2, 2);
System.out.println("x坐标为"+P1.x+"\ny坐标为"+P1.y);
P2.movePoint(1, 1);
System.out.println("x坐标为"+P2.x+"\ny坐标为"+P2.y);
}
}
- 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 xingqiwuDemo02;
public class Rectangle {
private int length;
private int width;
public Rectangle(int length, int width) {
super();
this.length = length;
this.width = 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("矩形的长为:"+length+"\n矩形的宽为:"+width+"\n矩形的面积为:"+length*width+"\n矩形的周长为:"+(length+width)*2);
}
}
package xingqiwuDemo02;
public class RectangleText {
public static void main(String[] args) {
// TODO Auto-generated method stub
Rectangle r=new Rectangle(2,4);
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 xingqiwuDemo03;
public class NoteBook {
private char color;
private int cpu;
public NoteBook(char color, int cpu) {
super();
this.color = color;
this.cpu = cpu;
}
NoteBook(){
}
public void showAll() {
System.out.println("笔记本信息\n颜色:"+color+"\ncpu:"+cpu);
}
}
package xingqiwuDemo03;
public class NoteBookText {
public static void main(String[] args) {
// TODO Auto-generated method stub
NoteBook n=new NoteBook('白',2500);
n.showAll();
}
}
• 5、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 xingqiwuDemo04;
public class Person {
private String name;
private int age;
private double heiht;
public void sayHello() {
System.out.println("Hello my name is"+name);
}
public Person(String name, int age, double heiht) {
super();
this.name = name;
this.age = age;
this.heiht = heiht;
}
}
package xingqiwuDemo04;
public class PersonCreate {
public static void main(String[] args) {
// TODO Auto-generated method stub
Person p1=new Person("zhangsan", 33, 1.73);
Person p2=new Person("lishi", 44, 1.74);
p1.sayHello();
p2.sayHello();
}
}
• 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、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 workdemo08;
public class Vehicle {
// 汽车品牌
private String brand;
// 汽车颜色
private String color;
// 汽车速度
private double speed;
public Vehicle(String brand, String color, double speed) {
super();
this.brand = brand;
this.color = color;
this.speed = 0;
}
public String getBrand() {
return brand;
}
public String getColor() {
return color;
}
public double getSpeed() {
return speed;
}
public void run() {
System.out.println("汽车正在行驶");
}
@Override
public String toString() {
return "Vehicle [brand=" + getBrand() + ", color=" + getColor() + ", speed=" + getSpeed() + "]";
}
}
package workdemo08;
public class VehicleText {
public static void main(String[] args) {
// TODO Auto-generated method stub
Vehicle V=new Vehicle("保时捷", "红色", 100);
V.run();
System.out.println(V.toString());
}
}
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