学生信息管理系统

实现班级学生信息管理。学生信息包括学号（不能相同）、姓名、籍贯、生日等四个字段。 程序能对学生信息进行输入、查询、删除、保存、按学号排序等操作。

import java.awt.*;
import java.awt.event.*;
import java.io.*;
public  class  Student extends WindowAdapter implements ActionListener,ItemListener
{
	//变量定义
	private Choice m_year, m_month,m_day;
	private Button button1,button2;	//录入，清除 
	private Checkbox  box1,box2,box3,box4;
	private TextArea  ta;
	Frame f;
	TextField f1,f2;
	CheckboxGroup sex,unite;
	//按钮事件监听
	public void actionPerformed(ActionEvent e)
	{  
	   if(e.getSource()==button1)
	   {
	    ta.append('\n'+f1.getText()+" "+f2.getText()
	    +"   "+sex.getSelectedCheckbox().getLabel()
	    +"    "+(m_year.getSelectedIndex()+1975)+"年"
	    +(m_month.getSelectedIndex()+1)+"月"
	    +(m_day.getSelectedIndex()+1)+"日"
	    +"    "+unite.getSelectedCheckbox().getLabel());
	    try{
	    	 FileWriter fout=new  FileWriter("白.txt");	 //输出到文件中保存   
	         fout.write(ta.getText());
	         fout.close();
	        }
	         catch(IOException we){}
	    }
	    else if(e.getSource()==button2)
	    {
	    	f1.setText("");
	    	f2.setText("");
	    }
	 }
	 public  void windowClosing(WindowEvent e)
	{
		System.exit(1);
	}	
  	//月份处理函数
   public void itemStateChanged(ItemEvent e){	  	 
     int month = m_month.getSelectedIndex();
     int  year = m_year.getSelectedIndex()+1975;
     int i,ik = 0;
     m_day.removeAll();
	 switch(month+1)
	 {
     case 1:     
     case 3:
     case 5: 
     case 7: 
     case 8:
     case 10:
     case 12:
           ik=31;
           break;  
     case 2:           
          if(year%4==0&&year%100!=0||year%400==0) { ik=29;}          
           else ik=28;           
           break;         
     case 4:          
     case 6:          
     case 9:          
     case 11:
           ik=30;
     default:
           
     }
     for(i=1;i<=ik;i++)
     {
     	m_day.add(i+"日");
     } 		
	}
	//创建控件
	public void Create()
		{
		int i;
		f=new Frame("学生信息系统");
		sex=new CheckboxGroup();
		unite=new CheckboxGroup();
		m_year=new Choice();
		m_month=new Choice();
		m_day=new Choice();
	    for(i=1975;i<=1990;i++)
		{
			
		   m_year.add(i+"年");	
		}
		for(i=1;i<=12;i++)
		{
			
		   m_month.add(i+"月");	
		}
		for(i=1;i<=31;i++)
		{
			
		   m_day.add(i+"日");	
		}
		m_month.addItemListener(this);
		m_year.addItemListener(this);		 		
	    box1 = new Checkbox("男",true,sex);
	    box2 = new Checkbox("女",false,sex);
	    box3 = new Checkbox("联合培养",true,unite);
	    box4 = new Checkbox("不联合培养",false,unite);
	    f1 = new TextField(6);
	    f2 = new TextField(6);	
	    Panel pan1 = new Panel();
	    Panel pan2 = new Panel();
	    Panel pan3 = new Panel();
	    Panel pan4 = new Panel();
	    Label l1 = new Label("姓名");
	    Label l2 = new Label("学号");
	    Label l3 = new Label("出生日期");
	    Label l4 = new Label("性别");	
	    button1 = new Button("录入");
	    button2 = new Button("清除");
	    ta=new TextArea();
	    f.setBackground(Color.gray);
	    f.setLayout(new FlowLayout(FlowLayout.LEFT,20,30));
	    pan1.setLayout(new GridLayout(1,2,5,8)); 
	    pan1.add(l1);
	    pan1.add(f1);	    
	    pan1.add(l2);
	    pan1.add(f2);
	      
	    pan3.add(l3);
	    pan3.add(m_year);	    	    
	    pan3.add(m_month);	    	    
	    pan3.add(m_day);
	    pan2.add(box3);
	    pan2.add(box4);
	    pan2.add(l4);
	    pan2.add(box1);
	    pan2.add(box2); 
	    f.add(pan1);
	    f.add(pan2);
	    f.add(pan3);
	    pan4.add(button1);
	    pan4.add(button2);
	    f.add(pan4);
	    f.add(ta);
	    button1.addActionListener(this);
	    button2.addActionListener(this);
	    f.addWindowListener(this);
	    f.setSize(500,500);
		f.setVisible(true);
		
	}
	 public  static void main(String args[])
	 
    {
		Student students=new Student();
		students.Create();	     
		
	}
	
}