/*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。[必作题]*/
package practice7.point;
public class Point {
double x;
double y;
public Point() {
}
public void Point(double x0,double y0) {
this.x = x0;
this.y = y0;
System.out.print("x的初始位置是" + this.x);
System.out.println(" " + "y的初始位置是" + this.y);
}
public void movePoint(double dx,double dy){
this.x += dx;
this.y += dy;
System.out.print("x移动了" + dx + "个单位长度");
System.out.println(" " + "y移动了" + dy + "个单位长度");
System.out.print("x移动后的位置为:" + this.x);
System.out.println(" " + "y移动后的位置为:" + this.y);
}
}
package practice7.point;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Point p1 = new Point();
p1.Point(11.1, 22.2);
p1.movePoint(33.3,44.4);
Point p2 = new Point();
p2.Point(55.5, 66.6);
p2.movePoint(77.7,88.8);
}
}

/*• 2、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 practice7.Rectangle;
public class Rectangle {
int length;
int width;
public Rectangle(int width,int length){
this.length = length;
this.width = width;
}
public int getArea(){
int area = length * width;
return area;
}
public int getPer(){
int per = (length + width)*2;
return per;
}
void showAll(){
System.out.println("length=" + length + " ");
System.out.println("width=" + width + " ");
System.out.println("area=" + getArea() + " ");
System.out.println("per=" + getPer());
}
}
package practice7.Rectangle;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Rectangle r = new Rectangle(12,55);
r.showAll();
}
}

/*• 3、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 practice7.Computer;
public class Computer {
char color;
int cpu;
public void computer() {
}
public void information(char color, int cpu) {
this.color = color;
this.cpu = cpu;
}
void showAll() {
System.out.println("color:"+color);
System.out.println("cup:"+cpu);
}
}
package practice7.Computer;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Computer c=new Computer();
c.information(‘粉‘,250);
c.showAll();
}
}

/*• 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 practice7.Person;
public class Person {
String name;
int age;
double height;
public void sayHello(){
System.out.println("hello,my name is " + name);
}
public void getValue(String name,int age,double height){
this.name = name;
this.age = age;
this.height = height;
}
}
package practice7.Person;
public class Constructor {
public static void main(String[] args) {
// TODO Auto-generated method stub
Person p1 = new Person();
p1.getValue("zhangsan",33,1.73);
p1.sayHello();
Person p2 = new Person();
p2.getValue("lishi",44,1.7);
p2.sayHello();
}
}

原文:https://www.cnblogs.com/wu-di-821-821/p/12808351.html