는 내가 그것을 선언을 읽는되지 않는 이유를 알 수

Question

임 텍스트 파일에 텍스트 필드의 내용 쓰기 :

import java.awt.event.ActionListener; 
    import java.awt.event.ActionEvent; 
    import javax.swing.SwingUtilities; 
    import java.io.FileNotFoundException; 
    import java.util.Formatter; 
    import javax.swing.*; 
    import java.util.*; 
    import java.io.*; 

    public class Payroll extends JFrame implements ActionListener{ 

    private JButton btn1; 
    private JButton btn2; 
    private JButton btnadd; 


    // initialize the lbl with caption name is employee information. 
    JLabel lbl = new JLabel("Nilai University Payroll System"); 

    public Payroll(){ 
    super("Nilai University Payroll System"); 
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

    setLayout(null); 

    JLabel lblid,lblname,lblrank,lblclass,lbltype,lblpay; 
    JTextField txtid,txtname,txtrank,txtclass,txtEmployeeClass,txtEmployeeType; 
    JRadioButton rb1,rb2,rb3,rb4,rb5; 

    lbl.setBounds(200,50,500,100); 
    lbl.setHorizontalAlignment(lbl.CENTER); 

    lblid = new JLabel("Employee ID: "); 
    lblname = new JLabel("Employee Name: "); 
    lblrank = new JLabel("Employee Rank: "); 
    lblclass = new JLabel("Employee Class: "); 
    lbltype = new JLabel("Class Type: "); 
    lblpay = new JLabel("Employee Pay Rate: "); 

    // initialize all the label which are declared in the example above with its caption name 
    lblid.setBounds(300,140,100,20); 
    lblname.setBounds(300,180,100,20); 
    lblrank.setBounds(300,220,100,20); 
    lblclass.setBounds(300,260,100,20); 
    lbltype.setBounds(300,300,100,20); 
    lblpay.setBounds(300,340,100,20); 

    // add all the label on the frame 
    add(lblid); 
    add(lblname); 
    add(lblrank); 
    add(lblclass); 
    add(lbltype); 
    add(lblpay); 

    // initialize the text field with size 
    txtid=new JTextField(15); 
    txtname=new JTextField(15); 
    txtclass=new JTextField(15); 
    txtEmployeeClass=new JTextField(15); 
    txtEmployeeType=new JTextField(15); 

    // set a particular position on a screen with set bounds constructor 
    txtid.setBounds(400,140,100,20); 
    txtname.setBounds(400,180,100,20); 
    txtclass.setBounds(400,220,100,20); 
    txtEmployeeClass.setBounds(400,260,100,20); 
    txtEmployeeType.setBounds(400,300,100,20); 

    // add text field on a Frame 
    add(txtid); 
    add(txtname); 
    add(txtclass); 
    add(txtEmployeeClass); 
    add(txtEmployeeClass); 

    // initialize radio button with its caption 
    rb1 = new JRadioButton("1. Excellent"); 
    rb2 = new JRadioButton("2. Good"); 
    rb3 = new JRadioButton("3. Average"); 
    rb4 = new JRadioButton("4. Fair"); 
    rb5 = new JRadioButton("5. Poor"); 

    // set a particular position on a Frame 
    rb1.setBounds(400,220,100,20); 
    rb2.setBounds(500,220,100,20); 
    rb3.setBounds(600,220,100,20); 
    rb4.setBounds(700,220,100,20); 
    rb5.setBounds(800,220,100,20); 

    // add button on a frame 
    add(rb1); 
    add(rb2); 
    add(rb3); 
    add(rb4); 
    add(rb5); 

    btnadd = new JButton("Add Employee"); 
    btnadd.setToolTipText("Click this button to add employee details to a text file."); 
    btnadd.setBounds(400,320,150,20); 
    add(btnadd); 
    btnadd.addActionListener(this); 
    btnadd.setActionCommand("Add"); 
    } 
    private BufferedWriter output; 
    public void actionPerformed(ActionEvent e){ 

     String cmd = e.getActionCommand(); 
     if(cmd.equals("Add")) 
     { 
      output.write("ID: "+txtid.getNume()+"\n"); 
     } 
    } 

    public void WriteFile(){ 
      try { 
     output = new BufferedWriter(new FileWriter("E:/EC3307/eclipse/Payroll.txt",true));   
       output.newLine(); 
       output.close(); 
      } 
      catch(IOException e) 
      { 
       System.out.println("There was a problem:" + e); 

      } 
     } 

    public static void main(String args[]){ 

     SwingUtilities.invokeLater(new Runnable(){ 
      @Override 
      public void run() 
      { 
       Payroll f1=new Payroll(); 
       // set frame size 
       f1.setSize(1000,600); 
       // set frame visible true 
       f1.setVisible(true); 
      } 
     }); 
     } 
    } 

Answer 1

문제는 txtid 로컬 사용자 Payroll 생성자의 변수가 아니라 구성원인지입니다 Payroll 클래스의 단순히 Payroll 클래스의 변수로 txtid를 선언하면 actionPerformed 메소드에서 액세스 할 수 있습니다.

Answer 2

정확히 문제가 무엇 급여() 생성자