第七次上机练习
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | /*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); } } |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | 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 ); } } |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | /*• 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()); } } |
1 2 3 4 5 6 7 8 9 10 11 12 13 | 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(); } } |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | /*• 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); } } |
1 2 3 4 5 6 7 8 9 10 11 12 13 | 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(); } } |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | /*• 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; } } |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | 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(); } } |
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