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]
class text9{
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;
}
}
2.2、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 pro1;
public class Rectangle {
private int length;
private int width;
Rectangle(int length, int width) {
this.length = length;
this.width = width;
}
public void showAll() {
System.out.println("矩形长为:" + length + " " + "矩形的宽为:" + width + " " + "矩形的面积为:" + getArea() + " " + "矩形的周长为:"
+ getPer());
}
public int getPer() {
return 2 * (length + width);
}
public int getArea() {
return length * width;
}
}
class RectangleDemo {
public static void main(String[] args) {
Rectangle r = new Rectangle(2, 3);
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。
class text9{
public static void main(String[] args) {
NoteBookComputer nbc=new NoteBookComputer('黑',1080);
System.out.println("颜色;"+nbc.getColor()+" "+"cpu:"+nbc.getCpu());
NoteBookComputer nbc2=new NoteBookComputer();
nbc2.setColor('红');
nbc2.setCpu(1060);
System.out.println("颜色;"+nbc2.getColor()+" "+"cpu:"+nbc2.getCpu());
}
}
public class NoteBookComputer {
private char color;
private int cpu;
public NoteBookComputer() {
}
public NoteBookComputer(char color, int cpu) {
this.color = color;
this.cpu = 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;
}
}
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、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。
public class Person { String name; int age; double height; public void sayHello(){ System.out.println("我的名字是 "+this.name); } public void getValue(String name,int age,double height){ this.name = name; this.age = age; this.height = height; } }
public class Constructor { public static void main(String[] args) { Person p1 = new Person(); p1.getValue("zs",22,1.12); p1.sayHello(); Person p2 = new Person(); p2.getValue("ls",13,1.22); p2.sayHello(); } }