JAVA程序设计实验指导书.doc

JAVA程序设计（公选课）实验指导书实验1实验目的：掌握如何编写、编译、运行Java应用程序。实验内容： 编写一个提示“Java is interesting! ”信息的应用程序。实验过程：1、 编写一个提示“Java is interesting! ”信息的应用程序具体实验内容：编写一个应用程序，当运行时，会出现一个提示信息对话框，其中显示信息“Java is interesting! ”。编写代码：（可使用记事本）import javax.swing.JOptionPane;public class Demo1 public static void main(String args) JOptionPane.showMessageDialog(null,"Java is interesting! "); System.exit(0); 实验2：实验目的：掌握使用图形化界面的形式，正确使用表达式和流控制语句进行编程，掌握break语句和continue语句如何在多重循环语句中正确使用。熟练掌握各种运算符和表达式的使用法。实验内容： 编程显示星形符号组成的图形：矩形和下三角。 开发一个具有数字计算功能的应用程序。实验过程：1、 编程显示星形符号组成的图形：矩形和下三角编写代码：import javax.swing.JOptionPane;public class LabelTest public static void main(String args) String output="The first graph:n" stop: for(int row=1; row<=15; row+) for(int column=1; column<=5; column+) if(row=5) break stop; output+="* " output+="n" output+="nnn" output+="The second graph:" nextRow: for(int row=1;row<=5;row+) output+="n" for(int column=1; column<=10; column+) if(column>row) continue nextRow; output+="* " JOptionPane.showMessageDialog(null,output,"Testing break with a label",JOptionPane.INFORMATION_MESSAGE); System.exit(0); 将以上代码保存为文件名为LabelTest.java的文件。2、 开发一个具有数字计算功能的应用程序实验内容： 首先产生两个随机数作为操作数，对它们分别进行加、减、乘、除和取余运算，将结果以图形化的形式显示出来。分两种情况进行：两个操作数都是整数类型和两个操作数都是实数类型。另外，使用扩展运算符进行以上运算，验证运算结果是否正确。编写代码：import javax.swing.JOptionPane;import java.util.*;public class MathOps public static void main(String args) Random rand=new Random(); int i,j,k; i=rand.nextInt(100)+1; j=rand.nextInt(100)+1; String output="Tow Integer Operands:n"+"i="+i+" "+"j="+j; k=i+j; output+="nAfter adding operation,result:n"+"i+j="+k; k=i-j; output+="nAfter subtracting operation,result:n"+"i-j="+k; k=i*j; output+="nAfter multiplying operation,result:n"+"i*j="+k; k=i/j; output+="nAfter dividing operation,result:n"+"i/j="+k; k=i%j; output+="nAfter caculating remainder operation,result:n"+"i%j="+k; float u,v,w; u=rand.nextFloat(); v=rand.nextFloat(); output="nnTow Float Operands:n"+"u="+u+" "+"v="+v; w=u+v; output+="nAfter adding operation,result:n"+"u+v="+w; w=u-v; output+="nAfter subtracting operation,result:n"+"u-v="+w; w=u*v; output+="nAfter multiplying operation,result:n"+"u*v="+w; w=u/v; output+="nAfter dividing operation,result:n"+"u/v="+w; output+="nnExtended Operation result:" u+=v; output+="nAfter extended adding operation(u+=v), result:n"+"u="+u; u-=v; output+="nAfter extended subtracting operation(u-=v), result:n"+"u="+u; u*=v; output+="nAfter extended multiplying operation(u*=v), result:n"+"u="+u; u/=v; output+="nAfter extended dividing operation(u/=v), result:n"+"u="+u; JOptionPane.showMessageDialog(null,output,"Arithmetic OperationDemon",JOptionPane.INFORMATION_MESSAGE); System.exit(0); 实验3实验目的：掌握定义类的方法，特别是要掌握如何编写构造函数和main ()函数，怎样创建和使用类的对象。实验内容： 创建一个日期类。 创建一个图书类。实验过程：1、 创建日期类具体实验内容：创建一个日期类，使得该类能够对日期的合法性进行验证，并将验证的结果以图形化的形式对日期信息进行正确显示。程序编码：import javax.swing.JOptionPane;public class DateTest private int month; private int day; private int year; private String validateDateString=new String(""); public DateTest(int month,int day,int year) validateDateString+="nDate object constructor for date"+month+"/"+day+"/"+year+" is calling!" if(month>0&&month<=12) this.month=month; validateDateString+="nThe month is valid." else month=1; validateDateString+="nMonth"+month+" is invalid. Set its value to month1." this.year=year; this.day=checkDay(day); private int checkDay(int testDay) int daysPerMonth=0,31,28,31,30,31,30,31,31,30,31,30,31; if(testDay>0 && testDay<=daysPerMonthmonth) validateDateString+="nThe dat is valid." return testDay; if(month=2&&testDay=29&&(year%400=0|(year%4=0&&year%100!=0) validateDateString+="nThe dat is valid." return testDay; validateDateString+="nDay "+testDay+" is invalid.Set its value to day 1." return 1; public String toString() return month+"/"+day+"/"+year; public String getValidateDateString() return validateDateString; public static void main(String args) DateTest date1=new DateTest(3,21,2004); DateTest date2=new DateTest(2,29,2004); DateTest date3=new DateTest(21,2,2003); JOptionPane.showMessageDialog(null,date1.getValidateDateString()+date2.getValidateDateString()+date3.getValidateDateString(), "DateTest Demo",JOptionPane.INFORMATION_MESSAGE); System.exit(0); 2、 创建一个图书类具体实验内容：创建一个图书类，为该类定义属性，并定义两个构造函数，一个是默认的构造函数，一个是带参数的构造函数，分别用这两个构造函数创建两个对象，将对象信息以Applet的形式打印显示。程序编码：/<applet code="ClassApplet.class" height=200 width=400>/</applet>import java.awt.*;import java.awt.Graphics;import java.util.*;import javax.swing.JApplet;public class ClassApplet extends JApplet private Book book1,book2; public void init() book1=new Book(); book1.setName("Java 2"); book1.setAuthor("houjunjie"); book1.setType("Computer science"); book1.setDate(new GregorianCalendar(2004,8,15); book2=new Book("Visual C+.net","Baoyijun","Computer science",new GregorianCalendar(2003,10,23); public void paint(Graphics g) super.paint(g); g.setColor(new Color(255,0,0); g.drawString("下面是两本书的信息：",120,40); g.drawString("第一本书的信息：",60,60); g.setColor(new Color(0,0,255); g.drawString("书名："+book1.getName(),60,80); g.drawString("作者："+book1.getAuthor(),60,100); g.drawString("类别："+book1.getType(),60,120); g.drawString("出版日期："+book1.getDate().get(Calendar.MONTH)+"/"+book1.getDate().get(Calendar.YEAR),60,140); g.setColor(new Color(255,0,0); g.drawString("第二本书的信息：",215,60); g.setColor(new Color(0,0,255); g.drawString("书名："+book2.getName(),215,80); g.drawString("作者："+book2.getAuthor(),215,100); g.drawString("类别："+book2.getType(),215,120); g.drawString("出版日期："+book2.getDate().get(Calendar.MONTH)+"/"+book2.getDate().get(Calendar.YEAR),215,140); class Book private String bookName; private String author; private String type; private GregorianCalendar publishedDate; public Book() this("unknown","unknown","unknown",new GregorianCalendar(); public Book(String bookName,String author,String type, GregorianCalendar publishedDate) this.bookName=bookName; this.author=author; this.type=type; this.publishedDate=publishedDate; public void setName(String name) bookName=name; public String getName() return bookName; public void setAuthor(String bookAuthor) author=bookAuthor; public String getAuthor() return author; public void setType(String bookType) type=bookType; public String getType() return type; public void setDate(GregorianCalendar date) publishedDate=date; public GregorianCalendar getDate() return publishedDate; 实验4实验目的：了解类的继承和多态的含义,了解使用接口的编程思想,掌握使用接口的编程方法.实验内容：使用类的继承和接口综合举例.实验过程：具体实验内容：定义一个接口Shape,在其中声明计算面积和体积的方法，用Point、Circle、Cylinder实现该接口，在类中详细定义接口中的方法。程序编码：public class InterfaceTest public static void main(String args) Point point=new Point(3,15); Circle circle=new Circle(5.5,23,10); Cylinder cylinder=new Cylinder(10,6.5,20,20); Shape shapes=new Shape3; shapes0=point; shapes1=circle; shapes2=cylinder; String output=point.getName()+": "+point.toString()+"n"+circle.getName()+": "+circle.toString()+"n"+cylinder.getName()+": "+cylinder.toString(); for(int i=0; i<shapes.length; i+) output+="nn"+shapesi.getName()+": "+shapesi.toString()+"nArea="+ shapesi.area()+"ttVolume="+shapesi.volume(); System.out.println(); System.out.println(output); interface Shape public abstract double area(); public abstract double volume(); public abstract String getName();class Point implements Shape protected int xPosition,yPosition; public Point() setPoint(0,0); public Point(int xPos,int yPos) setPoint(xPos,yPos); public void setPoint(int xPos,int yPos) xPosition=xPos; yPosition=yPos; public int getxPosition() return xPosition; public int getyPosition() return yPosition; public String toString() return "("+xPosition+","+yPosition+")" public double area() return 0.0; public double volume() return 0.0; public String getName() return "Point" class Circle extends Point protected double radius; public Circle() setRadius(0); public Circle(double circleRadius,int xPos,int yPos) super(xPos,yPos); setRadius(circleRadius); public void setRadius(double circleRadius) radius=(circleRadius>=0 ? circleRadius:0); public double getRadius() return radius; public double area() return Math.PI*radius*radius; public String toString() return "Center= "+super.toString()+"tRadius= "+radius; public String getName() return "Circle" class Cylinder extends Circle protected double height; public Cylinder() super(); setHeight(0); public Cylinder(double cylinderHeight,double cylinderRadius,int xPos,int yPos) super(cylinderRadius,xPos,yPos); setHeight(cylinderHeight); public void setHeight(double cylinderHeight) height=(cylinderHeight>=0 ? cylinderHeight:0); public double getHeight() return height; public double area() return 2*super.area()+2*Math.PI*radius*height; public double volume() return super.area()*height; public String toString() return super.toString()+" Height= "+height; public String getName() return "CyPositionlinder"