在工资支付系统中，雇员的记录由：雇员号、姓名(String)、地址(String)和工资(double).编写一个程序完成雇员记录的添加、修改、删除、查询功能
题目
在工资支付系统中，雇员的记录由：雇员号、姓名(String)、地址(String)和工资(double).编写一个程序完成雇员记录的添加、修改、删除、查询功能。要求在系统退出时将系统所有的雇员记录写入文件中；在下次进入系统时，从该文件中恢复雇员信息
代码
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
class Employee implements Serializable {
private int uid;
private String name;
private String address;
private double salary;
public Employee() {
}
public Employee(int uid, String name, String address, double salary) {
setUid(uid);
setName(name);
setAddress(address);
setSalary(salary);
}
@Override
public String toString() {
return "雇员号：" + uid + " 姓名：" + name + " 地址：" + address + " 工资：" + salary;
}
public int getUid() {
return uid;
}
public void setUid(int uid) {
this.uid = uid;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public double getSalary() {
return salary;
}
public void setSalary(double salary) {
this.salary = salary;
}
}
public class Main extends JFrame implements ActionListener {
private Vector<Employee> employees;
private JTextArea jTextArea;
private JButton insertButton;
private JButton deleteButton;
private JButton findButton;
private JButton modifyButton;
private Container container;
private InsertWindow insertWindow;
private DeleteWindow deleteWindow;
private FindWindow findWindow;
private ModifyWindow modifyWindow;
public Main() {
employees = new Vector<>();
jTextArea = new JTextArea(20, 48);
jTextArea.setForeground(Color.green);
jTextArea.setBackground(Color.black);
jTextArea.setEditable(false);
container = getContentPane();
container.setLayout(new FlowLayout());
insertButton = new JButton("插入");
insertButton.addActionListener(this);
deleteButton = new JButton("删除");
deleteButton.addActionListener(this);
findButton = new JButton("查找");
findButton.addActionListener(this);
modifyButton = new JButton("修改");
modifyButton.addActionListener(this);
addComponent();
setSize(500, 400);
read();
setText();
setLocationRelativeTo(null);
}
//内部类，实现输入并插入雇员信息
class InsertWindow extends JDialog implements ActionListener {
private JLabel uidLabel;
private JTextField uidTextFiled;
private JLabel nameLabel;
private JTextField nameTextFiled;
private JLabel addressLabel;
private JTextField addressTextField;
private JLabel salaryLabel;
private JTextField salaryTextFiled;
private Container container;
public JButton ensure;
public InsertWindow(Frame owner, String title, boolean modal) {
super(owner, title, modal);
container = getContentPane();
container.setLayout(new FlowLayout());
uidLabel = new JLabel("雇员号：");
uidTextFiled = new JTextField(14);
nameLabel = new JLabel("姓 名：");
nameTextFiled = new JTextField(15);
addressLabel = new JLabel("地 址：");
addressTextField = new JTextField(15);
salaryLabel = new JLabel("工 资：");
salaryTextFiled = new JTextField(15);
ensure = new JButton("确定插入");
container.add(uidLabel);
container.add(uidTextFiled);
container.add(nameLabel);
container.add(nameTextFiled);
container.add(addressLabel);
container.add(addressTextField);
container.add(salaryLabel);
container.add(salaryTextFiled);
container.add(ensure);
ensure.addActionListener(this);
setSize(250, 180);
setResizable(false);
setLocationRelativeTo(owner);//设置居中出现在父窗口上
setVisible(true);
}
public Employee getEmployee() {
Employee employee = new Employee();
employee.setUid(Integer.parseInt(uidTextFiled.getText()));
employee.setName(nameTextFiled.getText());
employee.setAddress(addressTextField.getText());
employee.setSalary(Double.parseDouble(salaryTextFiled.getText()));
return employee;
}
@Override
public void actionPerformed(ActionEvent actionEvent) {
if (actionEvent.getSource() == ensure) {
insert(getEmployee());
setText();
dispose();
}
}
}
//内部类，实现查找雇员信息
class FindWindow extends JDialog implements ActionListener{
private JLabel uidLabel;
private JTextField uidJTextField;
private JButton ensure;
private JTextArea jTextArea;
Container container;
public FindWindow(Frame owner, String title, boolean modal) {
super(owner, title, modal);
uidLabel = new JLabel("请输入要查找的雇员号：");
uidJTextField = new JTextField(15);
ensure = new JButton("确认查找");
jTextArea = new JTextArea(12,36);
jTextArea.setBackground(Color.lightGray);
jTextArea.setForeground(Color.black);
container = getContentPane();
container.setLayout(new FlowLayout());
container.add(uidLabel);
container.add(uidJTextField);
container.add(ensure);
container.add(jTextArea);
ensure.addActionListener(this);
setSize(400, 275);
setResizable(false);
setLocationRelativeTo(this);//设置居中出现在父窗口上
setVisible(true);
}
@Override
public void actionPerformed(ActionEvent actionEvent) {
if(actionEvent.getSource()==ensure){
int uid = Integer.parseInt(uidJTextField.getText());
int index = find(uid);
if(index==-1){
jTextArea.setText("未找到uid为"+uid+"的雇员");
}
else {
jTextArea.setText("找到以下内容：\n"+employees.elementAt(index).toString());
}
}
}
}
//内部类，实现删除雇员信息
class DeleteWindow extends JDialog implements ActionListener {
private JLabel uidLabel;
private JTextField uidJTextField;
private JButton ensure;
Container container;
public DeleteWindow(Frame owner, String title, boolean modal) {
super(owner, title, modal);
uidLabel = new JLabel("请输入要删除的雇员号：");
uidJTextField = new JTextField(15);
ensure = new JButton("确认删除");
container = getContentPane();
container.setLayout(new FlowLayout());
container.add(uidLabel);
container.add(uidJTextField);
container.add(ensure);
ensure.addActionListener(this);
setSize(200, 120);
setResizable(false);
setLocationRelativeTo(owner);//设置居中出现在父窗口上
setVisible(true);
}
@Override
public void actionPerformed(ActionEvent actionEvent) {
if (actionEvent.getSource() == ensure) {
delete(Integer.parseInt(uidJTextField.getText()));
setText();
dispose();
}
}
}
//内部类，实现修改雇员信息
class ModifyWindow extends JDialog implements ActionListener{
private JLabel preuidLabel;
private JTextField preuidJTextFiled;
private JLabel signLabel;
private JLabel uidLabel;
private JTextField uidTextFiled;
private JLabel nameLabel;
private JTextField nameTextFiled;
private JLabel addressLabel;
private JTextField addressTextField;
private JLabel salaryLabel;
private JTextField salaryTextFiled;
private Container container;
public JButton ensure;
public ModifyWindow(JFrame owner,String title,boolean modal){
super(owner,title,modal);
container = getContentPane();
container.setLayout(new FlowLayout());
preuidLabel = new JLabel("请输入要修改的雇员号");
preuidJTextFiled = new JTextField(15);
signLabel = new JLabel("请输入修改后的雇员信息");
uidLabel = new JLabel("雇员号：");
uidTextFiled = new JTextField(14);
nameLabel = new JLabel("姓 名：");
nameTextFiled = new JTextField(15);
addressLabel = new JLabel("地 址：");
addressTextField = new JTextField(15);
salaryLabel = new JLabel("工 资：");
salaryTextFiled = new JTextField(15);
ensure = new JButton("确定修改");
container.add(preuidLabel);
container.add(preuidJTextFiled);
container.add(signLabel);
Box h1 =Box.createHorizontalBox();
h1.add(uidLabel);
h1.add(uidTextFiled);
container.add(h1);
Box h2 =Box.createHorizontalBox();
h2.add(nameLabel);
h2.add(nameTextFiled);
container.add(h2);
Box h3 =Box.createHorizontalBox();
h3.add(addressLabel);
h3.add(addressTextField);
container.add(h3);
Box h4 =Box.createHorizontalBox();
h4.add(salaryLabel);
h4.add(salaryTextFiled);
container.add(h4);
container.add(ensure);
ensure.addActionListener(this);
setSize(250, 240);
setResizable(false);
setLocationRelativeTo(owner);//设置居中出现在父窗口上
setVisible(true);
}
@Override
public void actionPerformed(ActionEvent actionEvent) {
if(actionEvent.getSource()==ensure){
int index = find(Integer.parseInt(preuidJTextFiled.getText()));
if(index==-1){
JOptionPane.showMessageDialog(container,"你要修改的雇员不存在",null,JOptionPane.WARNING_MESSAGE);
}
else {
Employee employee = new Employee();
employee.setUid(Integer.parseInt(uidTextFiled.getText()));
employee.setName(nameTextFiled.getText());
employee.setAddress(addressTextField.getText());
employee.setSalary(Double.parseDouble(salaryTextFiled.getText()));
modify(index, employee);
setText();
}
this.dispose();
}
}
}
@Override
public void actionPerformed(ActionEvent e) {
if (e.getSource() == insertButton) {
insertWindow = new InsertWindow(this, "插入", true);
}
if (e.getSource() == deleteButton) {
deleteWindow = new DeleteWindow(this, "删除", true);
}
if(e.getSource()==findButton){
findWindow = new FindWindow(this,"查找",true);
}
if(e.getSource()==modifyButton){
modifyWindow = new ModifyWindow(this,"修改",true);
}
}
public void addComponent() {
container.add(jTextArea);
container.add(insertButton);
container.add(deleteButton);
container.add(findButton);
container.add(modifyButton);
}
public void setText() {
int sign = 1;
jTextArea.setText("");
for (Employee each : employees) {
jTextArea.append(sign + ". " + each.toString() + "\n");
sign++;
}
}
// 写入文件
public void write() {
try {
FileOutputStream file = new FileOutputStream("./employee.dat");
ObjectOutputStream out = new ObjectOutputStream(file);
out.writeObject(employees);
out.flush();
out.close();
file.close();
employees.clear();
} catch (Exception e) {
System.err.println(e);
}
}
//读取文件
public void read() {
try {
FileInputStream file = new FileInputStream("./employee.dat");
ObjectInputStream in = new ObjectInputStream(file);
employees = (Vector<Employee>) in.readObject();
in.close();
file.close();
} catch (Exception e) {
System.err.println(e);
}
}
//插入雇员信息
public void insert(Employee employee) {
employees.add(employee);
}
//删除雇员信息
public boolean delete(int uid) {
int index = find(uid);
if (index == - 1) {
return false;
} else {
employees.removeElementAt(index);
return true;
}
}
//查找雇员信息
public int find(int uid) {
for (int i = 0; i < employees.size(); i++) {
if (employees.elementAt(i).getUid() == uid) {
return i;
}
}
return - 1;//未找到返回-1
}
//修改雇员信息
public boolean modify(int index,Employee employee) {
if (index == - 1) {
return false;
} else {
//修改
employees.set(index,employee);
return true;
}
}
public static void main(String[] args) {
Main app = new Main();
app.setVisible(true);
app.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
//关闭时保存文件
app.write();
System.exit(0);
}
});
}
}
结果
