标签:static package alt imp 创建 pack 相关 mic tar
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 wjb; public class Point { int x; int y; public Point(){ } public Point(int x0,int y0){ this.x=x0; this.y=y0; } public void movePoint(int dx,int dy){ System.out.println("移动前的坐标为:"+x+","+y); System.out.println("移动的量:"+dx+" "+dy); this.x +=dx; this.y +=dy; System.out.println("移动后的坐标为:"+this.x+","+this.y); } }
package wjb; import java.util.*; import java.util.Random; public class wjb { public static void main(String[] args) { Point p1=new Point(1,1); Point p2=new Point(5,9); p1.movePoint(p2.x, p2.y); } }
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 wjb; public class Rectangle { int length; int width; public Rectangle(int length,int width){ this.length=length; this.width=width; } public int getArea(int length,int width){ return this.length*this.width; } public int getPer(int length,int width){ return (this.length+this.width)*2; } public void showAll(int length,int width){ System.out.println("长是:"+length+"宽是:"+width); System.out.println("面积是:"+getArea(length,width)); System.out.println("周长是:"+getPer(length,width)); } }
package wjb; import java.util.*; import java.util.Random; public class wjb { public static void main(String[] args) { Rectangle r=new Rectangle(1,2); r.showAll(r.length, r.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。 [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 wjb; public class Rectangle { private char color; private int cpu; public Rectangle(){ } public Rectangle(char color,int cpu){ this.color=color; this.cpu=cpu; } public char getColor(){ return color; } public int getCpu(){ return cpu; } public void setColor(char color){ this.color=color; } public void setCpu(int cpu){ this.cpu=cpu; } public void show(){ System.out.println("笔记本的颜色是:"+getColor()); System.out.println("笔记本的cpu是:"+getCpu()); } }
package wjb; import java.util.*; import java.util.Random; public class wjb { public static void main(String[] args) { Rectangle n=new Rectangle(‘黑‘,25); n.show(); Rectangle n2=new Rectangle(‘红‘,50); n2.show(); } }
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。
package wjb; public class Person { private String name; private double hight; private double weight; public Person(String name,double hight,double weight){ this.name=name; this.hight=hight; this.weight=weight; } public String getName(){ return name; } public double gethight(){ return hight; } public double getwight(){ return weight; } public void setName(String name){ this.name=name; } public void setHight(double hight){ this.hight=hight; } public void getWeight(double weight){ this.weight=weight; } public void sayHello(){ System.out.println("hello!my name is "+name); } }
package wjb; import java.util.*; import java.util.Random; public class wjb { 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(); } }
标签:static package alt imp 创建 pack 相关 mic tar
原文地址:https://www.cnblogs.com/w200100/p/12808355.html