Java复习编程题 30.doc

第一章：1编写类College，College中有一个方法init()，显示“威海职业学院”，编写类School，调用init()方法，在屏幕上显示3行“威海职业学院”。public class Collegepublic void init()System.out.println(威海职业学院);public class Schoolpublic static void main(String a)College c1=new College ();for (int i=0;i3;i+)c1.init ();第二章：1、自定义类Days及其方法dayInmonth( )。该方法的功能是返回用户输入月份的天数（二月份就按28天计算）。例如用户输入3，则该方法将返回值31；用户输入4，则该方法将返回值30。通过main（）方法将返回值显示出来。class Daysstaticint dayInmonth(int a)int s=31;switch(a)case 2: s=28;break;case 4: case 6: case 9: case 11: s=30;return s;public static void main(String args)int a=Integer.parseInt(args0);int b=dayInmonth(a);System.out.println(a+月有+b+天);第三章：1编写程序计算12+22+32+42+972+982+992+1002的值，输出class Qiuhestatic int sum=0;public static int cal()for (int i=1;i=100;i+)sum+=i*i;return sum;public static void main(String args)System.out.println(计算结果为+cal ();2.打印输出10行杨晖三角形class yanghuipublic static void main (String args)int i,j;int yhlevel=10;int yanghui;System.out.println(杨晖三角形:);yanghui=new intyhlevel;for(i=0;iyanghui.length;i+)yanghuii=new inti+1;yanghui00=1;for (i=1; iyanghui.length;i+)yanghuii0=1;for(j=1;jyanghuii.length-1;j+)yanghuiij=yanghuii-1j-1+yanghuii-1j;yanghuiiyanghuii.length-1=1;for (i=0; iyanghui.length;i+)for(j=0;jyanghuii.length;j+)System.out.print(yanghuiij+ );System.out.println(); 输出结果是：杨晖三角形:1 1 1 1 2 1 1 3 3 1 1 4 6 4 1 1 5 10 10 5 1 1 6 15 20 15 6 1 1 7 21 35 35 21 7 1 1 8 28 56 70 56 28 8 1 1 9 36 84 126 126 84 36 9 1第四章：1.自定义一数组并对数组中每个元素赋值，然后按逆序输出.2.编写一个程序用选择法对数组a=20,10,50,40,30,70,60,80,90,100进行由大到小的排序。importjava.io.*; publicclassArrayTest publicstaticvoidmain(Stringargs) inti; inta=newint5; for(i=0;i=0;i-)System.out.println(a+i+=ai); 2.import java.io.*; public class SelectSortpublic static void main(String args)int a=20,10,50,40,30,70,60,80,90,100;int temp;for (int i=0; ia.length-1;i+)for (int j=i+1; ja.length ; j+)if (aiaj) temp=ai;ai=aj; aj=temp; for (int k=0;ka.length ;k+)System.out.println(a+k+:+ak);第五章：1设计一个长方形类，成员变量包括长和宽。类中有计算面积和周长的方法，并有相应的set方法和get方法设置和获得长和宽。编写测试类测试是否达到预定功能。要求使用自定义的包。2设计雇员Employee类，记录雇员的情况，包括姓名、年薪、受雇时间，要求定义MyDate类作为受雇时间，其中包括工作的年、月、日，并用相应的方法对Employee类进行设置。编写测试类测试Employee类。要求使用自己的包。3 根据下面的要求编程实现复数类ComplexNumber。(1)复数类ComplexNumber的属性m_dRealPart实部，代表复数的实数部分。m_dlmaginPart虚部，代表复数的虚数部分。(2)复数类ComplexNumber的方法ComplexNumber()构造方法，将实部、虚部都置为0。ComplexNumber(doubler，doublei)构造方法，创建复数对象的同时完成复数的实部、虚部的初始化；r为实部的初值，i为虚部的初值。getRealPart()获得复数对象的实部。getlmaginaryPart()获得复数对象的虚部。setRealPart(doubled)把当前复数对象的实部设置为给定的形参的数字。setlmaginaryPart(doubled)把当前复数对象的虚部设置为给定形参的数字。complexAdd(ComplexNumberc)当前复数对象与形参复数对象相加，所得的结果也是复数值，返回给此方法的调用者。complexAdd(doublec)当前复数对象与形参实数对象相加，所得的结果仍是复数值，返回给此方法的调用者。complexMinus(ComplexNumberc)当前复数对象与形参复数对象相减，所得的结果也是复数值，返回给此方法的调用者。1 。package mypackage.math;class Rectangleprivate int length;private int width;public Rectangle(int length,int width)this.length=length;this.width=width;public void set(int length,int width)this.length=length;this.width=width;public void get()System.out.println(此长方形的长为+length+宽为+width);public int getLength()return length;public int getWidth()return width;public int calculatePerimeter()return 2*(length+width);public int calculateArea()return (length*width);public void print()System.out.println(此长方形的周长为+calculatePerimeter()+面积为+calculateArea();class Testpublic static void main(String args)Rectangle myrectangle=new Rectangle(15,10);myrectangle.get();myrectangle.print();myrectangle.set(20,15);System.out.println(长方形的长是+myrectangle.getLength()+宽是+ myrectangle .getWidth();myrectangle.print();2. package mypackage.employee;class MyDateprivate int year;private int month;private int day;public MyDate(int year,int month,int day)this.year=year;this.month=month;this.day=day;public int getYear()return year; public class Employeeprivate String name;private double salary;private MyDate hireDay;public Employee(String name,double salary,MyDate day)=name;this.salary=salary;hireDay=day;public void print()System.out.println(name+ +salary+hireYear();public int hireYear()return hireDay.getYear();class TestEmployeepublic static void main(String args)Employee a=new Employee(李明,20000,new MyDate(2000,10,1);Employee b=new Employee(王强,24000,new MyDate(1995,8,12);a.print();b.print();3public class ch5_e5_12public static void main(String args)ComplexNumber cNumber_1 = new ComplexNumber(3,-5);ComplexNumber cNumber_2 = new ComplexNumber(2,2);double d = 10.0;System.out.println(cNumber_1.toString() + 加 + cNumber_2.toString() + 等于 + cNumber_1.complexAdd(cNumber_2).toString();System.out.println(cNumber_1.toString() + 加 + d + 等于 + cNumber_1.complexAdd(d).toString();System.out.println(cNumber_1.toString() + 减 + cNumber_2.toString() + 等于 + cNumber_1.complexMinus(cNumber_2).toString();System.out.println(cNumber_1.toString() + 减 + d + 等于 + cNumber_1.complexMinus(d).toString();System.out.println(cNumber_1.toString() + 乘 + cNumber_2.toString() + 等于 + cNumber_1.complexMulti(cNumber_2).toString();System.out.println(cNumber_1.toString() + 乘 + d + 等于 + cNumber_1.complexMulti(d).toString();class ComplexNumber/域private double m_dRealPart;private double m_dImaginPart;/构造方法ComplexNumber()m_dRealPart = 0.0;m_dImaginPart = 0.0;ComplexNumber(double r,double i)m_dRealPart = r;m_dImaginPart = i;ComplexNumber(ComplexNumber c)m_dRealPart = c.getRealPart();m_dImaginPart = c.getImaginaryPart();/get,set方法double getRealPart()return m_dRealPart;double getImaginaryPart()return m_dImaginPart;void setRealPart(double d)m_dRealPart = d;void setImaginaryPart(double d)m_dImaginPart = d;/复数运算方法ComplexNumber complexAdd(ComplexNumber c)return new ComplexNumber(this.m_dRealPart + c.getRealPart(),this.m_dImaginPart + c.getImaginaryPart();ComplexNumber complexAdd(double c)return new ComplexNumber(this.m_dRealPart + c, this.m_dImaginPart);ComplexNumber complexMinus(ComplexNumber c)return new ComplexNumber(this.m_dRealPart - c.getRealPart(),this.m_dImaginPart - c.getImaginaryPart();ComplexNumber complexMinus(double c)return new ComplexNumber(this.m_dRealPart - c, this.m_dImaginPart);ComplexNumber complexMulti(ComplexNumber c)return new ComplexNumber(this.m_dRealPart * c.getRealPart() - this.m_dImaginPart * c.getImaginaryPart(),this.m_dRealPart * c.getImaginaryPart()+ this.m_dImaginPart * c.getRealPart();ComplexNumber complexMulti(double c)return new ComplexNumber(this.m_dRealPart * c, this.m_dImaginPart * c);/toString()public String toString()return ( + m_dRealPart + + + m_dImaginPart + i + );第六章：1有三个字符串，编写程序找出其中最大者。2编写一个程序，设定一个有大小写字母的字符串，先将字符串的大写字符输出，再将字符串中的小写字符输出。3设定5个字符串，要求只打印那些以字母“b”开头的串，编写程序完成。4设定一个有大小写字母的字符串和一个查找字符，使用类String方法IndexOf()来判断在该字符串中该字符出现的次数。1public class max1public static void main(String args)String s1= Hello Java;String s2= Java Applet;String s3= Java;String s;if(pareTo(s2)0)s=s2;else s=s1;if(pareTo(s3)0)s=s3;Systrm.out.println(big=+s);2public class outpublic static void main(String args)String s1= Hello Java;StringBuffer bufup=new StringBuffer();StringBuffer buflow=new StringBuffer();for(int I=0;Is1.length();I+)if(s1.charAt(i)97)bufup.append(s1.charAt(i);bufup.append( );else buflow.append(s1.charAt(i);buflow.append( );System.out.println(s1= +s1);System.out.println( uppercase= +bufup);System.out.println( lowercase= +buflow);3public class prin_b public static void main(String args)String s1=hello;String s2=bee;String s3=java;String s4=brove;String s5=bag;if(s1.indexOf(b)= =0)System.out.println(s1);if(s2.indexOf(b)= =0)System.out.println(s2);if(s3.indexOf(b)= =0)System.out.println(s3);if(s4.indexOf(b)= =0)System.out.println(s4);if(s5.indexOf(b)= =0)System.out.println(s5);4public class ppppublic static void main(String args)String s1=abcdefghi;int num=0;for (int i=0;is1.lastIndexOf(e);i+)i=s1.indexof(e,i);num+;System.out.print( s1=+s1+e=);if(num= =0)System.out.println( no found);else System.out.println(num);第七章：1、编一个应用程序，按行顺序地读取一个可读文件的内容2、使用对象的串行化机制，使用RandomAccessFile构造一个应用程序能够随机存取文件的记录，可显示、修改记录的内容3编写一个程序，从键盘输入一串字符，统计这串字符中英文字母、数字、其他符号的字符数。4编写一个程序，从键盘输入一串字符，从屏幕输出并将其存入a.txt文件中。5编写一个程序，从键盘输入10个整数，并将这些数据排序后在标准输出上输出。编程第1题import java.io.*;public class ReadFile public static void main(String args) String s;FileInputStream is;InputStreamReader ir;BufferedReader in;tryis=new FileInputStream(bbs.txt); ir=new InputStreamReader(is); in=new BufferedReader(ir); while(s=in.readLine()!=null) System.out.println(Read: +s); catch(FileNotFoundException e)System.out.println(File not found!); System.exit(-2); catch(IOException e)System.out.println(Error:+e); System.exit(-3); 编程第2题import java.io.*;class Day implements Serializable private int year,month,day;public Day() year=2000;month=9;day=21; public Day(int y,int m,int d) year=y; month=m;day=d;public int getYear() return year;public int getMonth() return month;public int getDay() return day;public void outPut() System.out.println(The date is:+year+年+month+月+day+日);class Employee implements Serializable public static final int NAMESIZE=40;public static final int RECORDSIZE=2*NAMESIZE+8+4*3;private String name;private double salary;private Day hireDay;public Employee()public Employee(String n,double s,Day d) name=n;salary=s;hireDay=d; public void print() System.out.println(name+ +salary+ +hireYear();public void raiseSalary(double byPercent) salary*=1+byPercent/100; public int hireYear() return hireDay.getYear(); public class ObjectSer public static void main(String args)throws IOException,ClassNotFoundException int i;Employee staff = new Employee3;staff0 = new Employee(Dong,600,new Day(1998,9,1);staff1 = new Employee(Wang,1000,new Day(1958,2,15);staff2 = new Employee(Meng,750,new Day(1995,3,15); FileOutputStream fo=new FileOutputStream(data.txt);ObjectOutputStream so=new ObjectOutputStream(fo);try for(i=0;i3;i+) so.writeObject(staffi);so.close(); catch(IOException e) System.out.println(Saving Error:+e);System.exit(1); for(i=0;i3;i+) staffi=null;FileInputStream fi=new FileInputStream(data.txt);ObjectInputStream si= new ObjectInputStream(fi);tryfor(i=0;i3;i+)staffi=(Employee) si.readObject();si.close(); catch(IOException e) System.out.print(Reading Error:+e);System.exit(1); for(i=0;i=A&ch=a&ch=0&ch=9)y+;elsez+;catch(IOException e)System.out.println(e.toString();System.out.println(英文字母：+x);System.out.println(数字字符：+y);System.out.println(其它字符：+z);4答：import java.io.*;public class InFilepublic static void main(String args)int ch;tryFileOutputStream out=new FileOutputStream(a.txt);while(ch=System.in.read()!=r)System.out.write(ch);out.write(ch);out.close();System.out.write(n);catch(IOException e)System.out.println(e.toString();System.out.println(输出至文件完毕！);5答：import java.io.*;public class Sortpublic static void main(String args)int a=new int10;byte b=new byte10;int t;String str;System.out.println(请输入10个整数：);tryfor(int i=0;i10;i+)System.out.print(No. +(i+1)+: );System.in.read(b);str=new String(b);str=str.trim();ai=Integer.parseInt(str);catch(IOException e)System.out.println(e.toString();catch(NumberFormatException e)System.out.println(e.toString();for(int i=0;i9;i+)for(int j=i+1;jaj)t=ai;ai=aj;aj=t;for(int i=0;i10;i+)System.out.println(ai+t);第八章：1编写一个Applet程序和相应的页面文件，通过页面文件传递参数，在Applet程序中绘制一个长方形（长方形的长度和宽度由页面文件传递）。2编写一个Applet程序，用来显示与Applet程序在同一文件夹下的图片文件“flower.jpg”。3编写一个Applet程序，用来循环播放与Applet程序在同一文件夹下的声音文件“sound.mid”，作为网页的背景音乐。4 编写程序，实现如图所示功能：在x和y两个文本框中输入数值，按下右面的任意按钮能进行相应的计算，并将结果显示在中间的文本区中，该区域可以用清除按钮清除。（本题15分）1.Applet代码如下：import java.awt.*;import java.applet.*;public class ParameterSend extends Appletint length,width;public void init()length=Integer.parseInt(getParameter(Length);width=Integer.parseInt(getParameter(Width);public void paint(Graphics g)g.setColor(Color.red);g.drawRect(10,10,length,width);HTML页面代码如下：ParameteSend2Applet代码如下：import java.awt.*;import java.applet.Applet;public class ImageApplet extends Applet Image image;public void init()image = getImage(getCodeBase(),flower.jpg);public void paint(Graphics g)setBackground(Color.lightGray); g.drawString(The following is a image,40,20);g.drawImage(image,20,30,150,100,this);HTML页面代码如下：3.Applet代码如下：import java.awt.Graphics;import java.applet.*;public class SoundApplet extends AppletAudioClip soundObj;public void init()soundObj=getAudioClip(getCodeBase(),sound.mid);public void paint(Graphics g)g.drawString(playing audio ,10,40);public void start()soundObj.loop();public void stop()soundObj.stop();HTML页面代码如下：4、import java.awt.*;import java.awt.event.*;class jisuanqi implements ActionListenerFrame f=new Frame(计算器);Panel p=new Panel();Panel p1=new Panel();Panel p2=new Panel();Button b=new Button(x+y);Button b1=new Button(x-y);Button b2=new Button(清除);Label lbx=new Label(x);Label lby=new Label(y);TextField tfx=new TextField(4);TextField tfy=new TextField(4);TextArea ta=new TextArea();Font ft =new Font(宋体,Font.BOLD,18);GridLayout g1=new GridLayout(4,1);GridLayout g2=new GridLayout(2,1);double x,y,sum;public static void main(String args)jisuanqi ji=new jisuanqi() ;ji.go();public void go()b.setFont(ft);b1.setFont(ft);b2.setFont(ft);lbx.setAlignment(Label.CENTER);lby.setAlignment(Label.CENTER);lbx.setFont(ft);lby.setFont(ft);tfx.setFont(ft);tfy.setFont(ft);ta.setFont(ft);p.setLayout(g1);p.add(lbx);p.add(tfx);p.add(lby);p.add(tfy);f.add(p,West);p1.setLayout(g2);p1.add(b);p1.add(b1);b.addActionListener(this);b1.addActionListener(this);f.add(p1,East);p2.add(b2);b2.addActionListener(this);f.add(p2,South);f.add(ta,Center);f.setSize(250,150);f.setVisible(true);public void actionPerformed(ActionEvent ae)String s=ae.getActionCommand();x=Double.parseDouble(tfx.getText();y=Double.parseDouble(tfy.getText();if (s.equals(x+y)=true)ta.append(x+y=+(x+y)+n);if (s.equals(x-y)=true)ta.append(x-y=+(x-y)+n);if (s.equals(清除)=true)ta.setText();第九章：、一、 1、创建一个有一个文本区域和三个按钮的程序。当我们按下每个按钮时，使不同的文字显示在文本区域中。2 编写程序，创建下面的GUI(不必为各组件提供功能)。3.创建下面的GUI，颜色列表框为红色、绿色和蓝色（不必为各组件提供功能）。4 。编程实现程序菜单功能，用户单击Press Me按钮，在小程序的状态栏上显示Button Clicked,假设字号为12，字型为常规。5. 创建下面的GUI，要求在文本框中输入分数，单击“求和”按钮后在结果文本框中显示总分。题6图6编写一个将华氏温度转换为摄氏温度的程序。应从键盘输入华氏温度，然后通过文本显示转换后的摄氏温度。使用下面的公式进行温度转换：摄氏温度=5/9(华氏温度-32)7编写一个程序，使用户能够使用鼠标在applet中绘制一个矩形。按住鼠标左键，确定矩形的左上角，然后拖动鼠标，在需要的位置（即矩形右下角）释放鼠标。另外，在状态栏中显示矩形面积。编程第1题import javax.swing.*;import java.awt.*;import java.awt.event.*;import javax.swing.event.*;class SwingTest extends JFrame implements ActionListenerprivate int count=0;private JButton b1=new JButton(英文);private JButton b2=new JButton(中文);private JButton b3=new JButton(标点);private JTextArea mytext=new