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。
package kksk;
public class kksk {
public static void main(String[] args) {
point p1=new point(1,2);
point p2=new point(1,2);
System.out.println("p1坐标为"+"("+p1.getX()+","+p1.getY()+")");
System.out.println("p2坐标为"+"("+p2.getX()+","+p2.getY()+")");
p1.movePoint(2,3);
p2.movePoint(3,4);
System.out.println("p1坐标为"+"("+p1.getX()+","+p1.getY()+")");
System.out.println("p2坐标为"+"("+p2.getX()+","+p2.getY()+")");
}
}
public class point {
private int x;
private int y;
public point() {
}
public point(int x, int y) {
this.x = x;
this.y = y;
}
public void movePoint(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;
}
}
2、定义一个矩形类Rectangle:(知识点:对象的
创建和使用)
• 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 method;
public class Rectangle {
double length;
double width;
public Rectangle(double length,double width){
this.length=length;
this.width=width;
}
public double getArea(double length,double width){
return this.length*this.width;
}
public double getPer(double length,double width){
return 2*(this.length+this.width);
}
public void showAll(double length,double width){
System.out.printf("长方形的长为:%3.3f,宽为:%3.3f\n",this.length,this.width);
System.out.printf("长方形的面积为:%3.3f\n",getArea(length,width));
System.out.printf("长方形的周长为:%3.3f\n",getPer(length,width));
}
public static void main(String[] args) {
// TODO Auto-generated method stub
Rectangle rectangle=new Rectangle(4,5);
rectangle.showAll(rectangle.length,rectangle.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。
• 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 chap3;
public class bijiben {
public String name;
char color;
int xinghao;
public void getDate() {
}
public void getDate(char color, int xinghao) {
this.color = color;
this.xinghao = xinghao;
}
public void showAll() {
System.out.println(name + "颜色为" + color + "型号" + xinghao);
}
}
package chap3;
public class Person {
public static void main(String[] args) {
bijiben rc = new bijiben();
rc.name = "笔记本";
rc.getDate('a', 7);
rc.showAll();
}
}
6、定义两个类,描述如下:
• 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 hp;
public class Person {
String name;
double height;
int age;
public void sayHello(){
System.out.println("hello,my name is " + this.name );
}
public void Value(String name, int age, double height){
this.name = name;
this.age = age;
this.height = height;
}
}
package hp;
public class Constructor {
public static void main(String[] args) {
// TODO Auto-generated method stub
Person p1 = new Person();
p1.Value("zhangsan",33,1.74);
p1.sayHello();
Person p2 = new Person();
p2.Value("lishi",44,1.74);
p2.sayHello();
}
}