/*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(); } }