一段关于JAVA程序升级的问题（Changing bits） 请高手帮忙实现一个IO的Java程序题
\u4e0b\u5217\u6709\u5173Java\u7a0b\u5e8f\u7684\u8bf4\u6cd5\u4e2d\u6b63\u786e\u7684\u662f\u9009D
A \u5373\u4f7fjava\u662f\u89e3\u91ca\u6267\u884c\u7684\u4f46\u662f\u4ecd\u9700\u8981\u8fdb\u884c\u7f16\u8bd1
B\u4e00\u4e2ajava\u6e90\u7a0b\u5e8f\u7f16\u8bd1\u540e\u53ef\u80fd\u4ea7\u751f\u4e00\u4e2a\u6216\u8005\u591a\u4e2aclass\u7684\u5b57\u8282\u7801\u6587\u4ef6
C\u5b89\u88c5JDK\u540e\u4ecd\u9700\u624b\u52a8\u914d\u7f6e\u73af\u5883\u53d8\u91cf\u624d\u53ef\u6b63\u5e38\u4f7f\u7528
\u8c22\u8c22\u91c7\u7eb3
\u4f60\u6240\u8bf4\u7684\u65e5\u5386\u7c7b\u53d6\u5f97\u5929\u6570\u6bcf\u4e2a\u6708\u90fd\u662f31\u5929\uff0c\u6211\u770b\u4e86\uff0c
\u539f\u56e0\u662f\u6211\u63a5\u6536\u7684\u6708\u4efd\u53c2\u6570\u662f0--11\uff0c\u4f60\u8f93\u516511\uff0c\u5b9e\u9645
\u4e0a\u662f\u8868\u793a12\u6708\uff0c\u8f93\u51650\uff0c\u8868\u793a1\u6708\u3002
-----------StuClass.java------------------
import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class StuClass{
protected StuClass() throws IOException, SecurityException {
super();
}
private static final String FILE_PATH = "D:\\data.dat";
private List stuList = new ArrayList();
/**
* \u4fdd\u5b58\u589e\u52a0\u7684\u5b66\u751f
*
* @param stu
* @throws IOException
*/
public void saveStudent(Student stu) throws IOException {
File f = new File(FILE_PATH);
OutputStream output = new FileOutputStream(f, true);
MyObjectWriter objOut = new MyObjectWriter(output);
objOut.writeObject(stu);
objOut.close();
output.close();
}
/**
* \u589e\u52a0\u5b66\u751f
*
* @param student
* @throws IOException
*/
public void addStudent(String student) throws IOException {
String temp[] = student.split(",");
if (temp.length != 4) {
System.out.println("\u8f93\u5165\u683c\u5f0f\u4e0d\u5408\u6cd5\uff01");
return;
}
Student stu = new Student();
stu.setName(temp[0]);
try {
stu.setChinese(Double.parseDouble(temp[1]));
stu.setMath(Double.parseDouble(temp[2]));
stu.setEnglish(Double.parseDouble(temp[3]));
} catch (Exception e) {
System.out.println("\u8f93\u5165\u6570\u5b57\u4e0d\u5408\u6cd5\uff01");
stu = null;
}
if (stu != null) {
this.saveStudent(stu);
}
}
/**
* \u5220\u9664\u5b66\u751f
*
* @param name
* @throws IOException
* @throws ClassNotFoundException
*/
public void deleteStudent(String name) throws IOException,
ClassNotFoundException {
this.loadStudent();
Student student = null;
for (Student stu : stuList) {
if (stu.getName().equals(name)) {
student = stu;
break;
}
}
if (student == null)
return;
stuList.remove(student);
File f = new File(FILE_PATH);
OutputStream output = new FileOutputStream(f);
MyObjectWriter objOut = new MyObjectWriter(output);
for (Student stu : stuList) {
objOut.writeObject(stu);
}
objOut.close();
output.close();
}
/**
* \u6253\u5370\u6240\u6709\u5b66\u751f\u4fe1\u606f
*/
public void printStudents() {
for (Student st : stuList) {
st.detail();
}
}
/**
* \u52a0\u8f7d\u6240\u6709\u5b66\u751f
*
* @throws IOException
* @throws ClassNotFoundException
*/
public void loadStudent() throws IOException, ClassNotFoundException {
stuList = new ArrayList();
File f = new File(FILE_PATH);
InputStream input = new FileInputStream(f);
ObjectInputStream objInput = new ObjectInputStream(input);
try {
Student obj = (Student) objInput.readObject();
while (obj != null) {
Student student = (Student) obj;
stuList.add(student);
obj = (Student) objInput.readObject();
}
} catch (EOFException e) {
}
objInput.close();
input.close();
}
public static void main(String[] args) throws IOException,
IllegalArgumentException, IllegalAccessException,
ClassNotFoundException {
StuClass stuClass = new StuClass();
while (true) {
System.out.println("-------------\u9009\u62e9\u64cd\u4f5c------------------");
System.out.println("1.\u589e\u52a0 2.\u5220\u9664 3.\u67e5\u770b\u6240\u6709 4.\u9000\u51fa");
Scanner scanner = new Scanner(System.in);
int option = 0;
String sOp = scanner.nextLine();
try {
option = Integer.parseInt(sOp);
} catch (Exception e) {
System.out.println("\u65e0\u6b64\u9009\u9879\uff0c\u91cd\u65b0\u9009\u62e9\uff01");
sOp = scanner.nextLine();
option = Integer.parseInt(sOp);
}
switch (option) {
case 1: {
do {
System.out.println("-------------\u589e\u52a0\u5b66\u751f\u4fe1\u606f---------------");
System.out.println("\u683c\u5f0f:\u59d3\u540d,\u8bed\u6587\u6210\u7ee9,\u6570\u5b66\u6210\u7ee9,\u82f1\u8bed\u6210\u7ee9");
System.out.println("-----------\u8bf7\u8f93\u5165\u6210\u7ee9------------");
String value = scanner.nextLine();
stuClass.addStudent(value.trim());
System.out.println("\u662f\u5426\u7ee7\u7eed\u6dfb\u52a0(y/n)");
String isContinue = scanner.nextLine();
if (!isContinue.equalsIgnoreCase("y"))
break;
} while (true);
}
break;
case 2: {
do {
System.out.println("-------------\u5220\u9664\u5b66\u751f\u4fe1\u606f---------------");
System.out.println("\u8bf7\u8f93\u5165\u5b66\u751f\u59d3\u540d:");
String value = scanner.nextLine();
stuClass.deleteStudent(value.trim());
System.out.println("\u662f\u5426\u7ee7\u7eed\u5220\u9664(y/n)");
String isContinue = scanner.nextLine();
if (!isContinue.equalsIgnoreCase("y"))
break;
} while (true);
}
break;
case 3: {
do {
System.out.println("-------------\u67e5\u8be2\u5b66\u751f\u4fe1\u606f---------------");
stuClass.loadStudent();
stuClass.printStudents();
System.out.println("\u662f\u5426\u7ee7\u7eed(y/n)");
String isContinue = scanner.nextLine();
if (!isContinue.equalsIgnoreCase("y"))
break;
} while (true);
}
break;
case 4:
System.exit(0);
default:
System.out.println("\u65e0\u6b64\u9009\u9879");
break;
}
}
}
}
/**
* \u7528\u6765\u5199\u5165\u5bf9\u8c61\u7684\u7c7b\uff0c\u76f4\u63a5\u7528ObjectOutptStream\uff0c
* \u6bcf\u6b21\u90fd\u4f1a\u5199\u4e00\u4e2a \u6807\u8bc6\u5934\u90e8\uff0c\u5728\u8bfb\u5165\u7684\u65f6\u5019\uff0c\u5c31\u4f1a\u5f15\u53d1\u5f02\u5e38\u3002
* \u6b64\u7c7b\u6dfb\u52a0\u529f\u80fd\u5224\u65ad\uff0c\u770b\u662f\u5426\u662f\u7b2c\u4e00\u6b21\u5199\u5165\uff0c\u5982\u679c\u662f\u624d\u5199\u6587\u4ef6\u5934\uff0c
* \u5426\u5219\u4e0d\u5199\u3002
*
*/
class MyObjectWriter extends ObjectOutputStream {
public MyObjectWriter(OutputStream out) throws IOException {
super(out);
}
@Override
public void writeStreamHeader() throws IOException {
if (checkFile())
super.writeStreamHeader();
else
super.reset();
}
public boolean checkFile() {
File f = new File("D:\\data.dat");
if (f.length() > 0) {
return false;
}
return true;
}
}
-----------Student.java-----------------
import java.io.Serializable;
class Student implements Serializable {
/**
*
*/
private static final long serialVersionUID = -553149347006327008L;
// \u59d3\u540d
private String name;
// \u82f1\u8bed\u6210\u7ee9
private double english;
// \u6570\u5e8f\u6210\u7ee9
private double math;
// \u8bed\u6587\u6210\u7ee9
private double chinese;
public double getChinese() {
return chinese;
}
public void setChinese(double chinese) {
this.chinese = chinese;
}
public double getEnglish() {
return english;
}
public void setEnglish(double english) {
this.english = english;
}
public double getMath() {
return math;
}
public void setMath(double math) {
this.math = math;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public void detail() {
System.out.print("\u59d3\u540d:" + this.name + "\t");
System.out.print("\u8bed\u6587:" + this.chinese + "\t");
System.out.print("\u82f1\u8bed:" + this.english + "\t");
System.out.println("\u6570\u5e8f:" + this.math);
}
}
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.event.CaretEvent;
import javax.swing.event.CaretListener;
public class BitChanger {
public static void main(String[] args) {
try{UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());}catch(Exception e){}
String s="HELLO";
System.out.println(s);
System.out.println(toBinaryString(s));
System.out.println(toHexString(s));
System.out.println(changeBit(toBinaryString(s),12));
System.out.println(toNormalString(changeBit(toBinaryString(s),12)));
System.out.println(toHexString(toNormalString(changeBit(toBinaryString(s),12))));
JFrame f=new JFrame("Bit changer v1.0");
f.setSize(433,230);
f.setDefaultCloseOperation(3);
f.getContentPane().setLayout(null);
JLabel l1=new JLabel("Enter a string:");
final JTextField input=new JTextField(20);
final JLabel binary=new JLabel();
final JLabel hex=new JLabel();
JLabel l2=new JLabel("Enter the Bit number to flip:");
final JTextField flip=new JTextField(5);
JButton change=new JButton("<html>Change<br>Bit");
JButton exit=new JButton("Exit");
l1.setBounds(10,10,100,25);
input.setBounds(110,10,100,25);
binary.setBounds(10,45,400,25);
hex.setBounds(10,80,400,25);
l2.setBounds(10,115,208,25);
flip.setBounds(220,115,40,25);
change.setBounds(270,115,68,45);
exit.setBounds(123,150,60,30);
f.add(l1);
f.add(l2);
f.add(input);
f.add(binary);
f.add(hex);
f.add(flip);
f.add(change);
f.add(exit);
f.setVisible(true);
binary.setBorder(BorderFactory.createLineBorder(Color.blue));
hex.setBorder(BorderFactory.createLineBorder(Color.red));
input.addCaretListener(new CaretListener(){
public void caretUpdate(CaretEvent e) {
binary.setText(toBinaryString(input.getText()));
hex.setText(toHexString(input.getText()));
}});
change.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
try{
int id=Integer.parseInt(flip.getText().trim());
input.setText(toNormalString(changeBit(toBinaryString(input.getText()),id)));
}catch(Exception ex){}
}});
exit.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
System.exit(-1);
}});
}
private static String toNormalString(String binary){
String[] sp=binary.split(" ");
String v="";
for(int i=0; i<sp.length; i++){
v+=(char)Integer.valueOf(sp[i],2).intValue();
}
return v;
}
private static String changeBit(String s,int bi){
if(s.isEmpty())return s;
int cid=bi/8;
int bid=bi%8;
char ch=s.charAt(cid*9+bid-1);
ch=ch=='0'?'1':'0';
s=s.substring(0,cid*9+bid-1)+ch+s.substring(cid*9+bid);
return s;
}
private static String toBinaryString(String s) {
if(s.isEmpty())return s;
String v="";
for(int i=0; i<s.length(); i++){
String bs=Integer.toBinaryString(s.charAt(i));
while(bs.length()<8)
bs='0'+bs;
v+=bs+" ";
}
return v;
}
private static String toHexString(String s){
if(s.isEmpty())return s;
String v="";
for(int i=0; i<s.length(); i++){
String bs=Integer.toHexString(s.charAt(i));
v+=" "+bs.toUpperCase()+" ";
}
return v;
}
}
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绛旓細绗竴涓猚lass public class NameTokenizer { private String lastname,middlename,firstname;public NameTokenizer(String name){ java.util.StringTokenizer st = new java.util.StringTokenizer(name);firstname = st.nextToken();middlename = st.nextToken();lastname = st.nextToken();} public ...
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