简单实现Java版学生管理系统

package BookDemo_1;  import javax.swing.*;  import java.awt.*; import java.awt.event.*;  public class Test {   public static void main(String[] args) {     StudentSys stuSys=new StudentSys("学生管理系统");     stuSys.initWin();   }  } class StudentSys extends JFrame{      private JPanel p1,p2,p3,combop;   private JTabbedPane tab;   private Container container;   private JButton b1,b2;   private Listener listener;   private Label nameLabel;   private Label gradeLabel;   private Label showLabel;   private JTextField textName;   private JTextField textGrade;   private TextArea showGradeArea;   /*   * 查找   * */   private Label searchLabel;   private JTextField searchText;   private JButton sBut;   private JTextField resultText;   private String[] name;   private String[] grade;      /*   * 排序   * */   private TextArea showTextArea;   private JButton sortBut;   private int countNum=0;   private JButton clearBut;   public StudentSys(String str){     super(str);          this.name=new String[100];     this.grade=new String[100];     listener = new Listener();     tab = new JTabbedPane(JTabbedPane.TOP);      //容器     container = this.getLayeredPane();     //对象化面板     combop = new JPanel();     p1 = new JPanel();     p2 = new JPanel();     p3 = new JPanel();          b1 =new JButton("确认添加");     b2 =new JButton("撤回添加");     nameLabel =new Label("姓名");     gradeLabel =new Label("成绩");          showLabel=new Label("当前记录为零！             ");          textName =new JTextField(15);     textGrade =new JTextField(15);     showGradeArea=new TextArea();          /*     * 查找     * */     searchLabel=new Label("请输入姓名：");     searchText=new JTextField(15);     sBut=new JButton("确认查找");     resultText=new JTextField(15);     /*     * 排序     * */     showTextArea=new TextArea();     sortBut=new JButton("成绩排序");     clearBut=new JButton("清空数据");   }   public void initWin(){     this.setBounds(300, 300, 500, 400);     this.addWindowListener(new WindowAdapter(){       public void windowClosing(WindowEvent e) {         super.windowClosing(e);         System.exit(0);       }});       layoutWin();       this.setVisible(true);   }   private void layoutWin(){          tab.add(p1,"成绩输入");     tab.add(p2,"成绩查询");     tab.add(p3,"成绩排序");     combop.add(new JLabel("学生信息管理系统"));     container.setLayout(new BorderLayout());     container.add(combop,BorderLayout.NORTH);     container.add(tab,BorderLayout.CENTER);          Container con1=new Container();     con1.setLayout(new FlowLayout());     con1.add(nameLabel);     con1.add(textName);          con1.add(gradeLabel);     con1.add(textGrade);     p1.add(con1,BorderLayout.NORTH);     p1.add(con1);     p1.add(showGradeArea);          Container con2=new Container();     con2.setLayout(new FlowLayout());     con2.add(b1);     con2.add(b2);     con2.add(showLabel);     p1.add(con2);     b1.addActionListener(listener);     b2.addActionListener(listener);     /*     * 查找布局     * */          Container con3=new Container();     con3.setLayout(new FlowLayout());     con3.add(searchLabel);     con3.add(searchText);     con3.add(sBut);     p2.add(con3,BorderLayout.NORTH);     sBut.addActionListener(listener);     p2.add(resultText);     /*     * 排序布局     * */     p3.add(showTextArea);     p3.add(sortBut);     p3.add(clearBut);     sortBut.addActionListener(listener);     clearBut.addActionListener(listener);   }   /*   * java内部类实现ActionListener接口   * */   class Listener implements ActionListener{     @Override       public void actionPerformed(ActionEvent e) {              if(e.getSource()==b1){                  if((textName.getText().equals(""))||(textGrade.getText().equals(""))){           showLabel.setText("添加失败(姓名,成绩不能有空)！");         }         else{           name[countNum]=textName.getText();           grade[countNum]=textGrade.getText();           countNum++;           String area="添加成功,当前有"+countNum+"条记录";           showLabel.setText(area);           sortMess(false);           textName.setText("");           textGrade.setText("");         }                }       if(e.getSource()==b2){         if(countNum>0){           countNum--;           String area="撤回成功,当前有"+countNum+"条记录";           showLabel.setText(area);           sortMess(false);         }       }       if(e.getSource()==sBut){         if(!searchText.getText().equals("")){           searchMess(searchText.getText());         }       }       if(e.getSource()==sortBut){         sortMess(true);       }       if(e.getSource()==clearBut){         if(!showTextArea.getText().equals("")){           showTextArea.setText("");          }       }     }          public void sortMess(boolean sign) {       // TODO Auto-generated method stub       if(sign){         for(int i=0;i<countNum;i++){           for(int j=i+1;j<countNum;j++){             if(Integer.parseInt(grade[i])<Integer.parseInt(grade[j])){               String s1,s2;               s1=name[i];               s2=grade[i];                              name[i]=name[j];               grade[i]=grade[j];                              name[j]=s1;               grade[j]=s2;             }           }         }       }else{                 if(!showGradeArea.getText().equals("")){           showGradeArea.setText("");         }       }       for(int i=0;i<countNum;i++){         String content="姓名:"+name[i]+"/t"+"成绩"+grade[i];         if(sign)showTextArea.append(content+"/n");         else showGradeArea.append(content+"/n");       }     }          public void searchMess(String n) {       // TODO Auto-generated method stub              for(int i=0;i<countNum;i++){         if(name[i].equals(n)){           String content="姓名:"+name[i]+","+"成绩"+grade[i];           resultText.setText(content);           return;         }       }       resultText.setText("未找到该学生!");     }   } }