給JList的消息

Question

嘿所有goodevening我有一個關於我的第二個按鈕名爲「提交」的問題，因爲我無法將我輸入的所有信息傳遞給框架中的null JList這裏是我的代碼迄今爲止我的問題是如果我單擊提交我的所有信息都會顯示在我的消息區域中，並且需要列出。謝謝

import javax.swing.*; 
import java.awt.*; 
import java.awt.event.*; 

public class vin extends JFrame 
{ 
     JLabel lab = new JLabel("Enter Your Name :"); 
     JLabel lab2 = new JLabel("Enter Your Birthday :"); 
     JLabel lab3 = new JLabel("Enter Your Age:"); 
     JLabel lab4 = new JLabel("Enter Your HomeTown:"); 
     JLabel lab5 = new JLabel("Choose Your Department:"); 
     JButton b1 = new JButton("Exit"); 
     JTextField t1 = new JTextField(15); 
     JTextField t2 = new JTextField(15); 
     JTextField t3 = new JTextField(15); 
     JTextField t4 = new JTextField(15); 
     JButton b2 = new JButton("Submit"); 
     JButton b3 = new JButton("Clear"); 
     JLabel lab6 = new JLabel("Message :"); 
     JList list = new JList(); 
     JPanel panel = new JPanel(); 
     JLabel brief; 

    public vin() 
    { 

     setLocation(500,280); 
     panel.setLayout(null); 


     lab.setBounds(10,10,150,20); 
     t1.setBounds(130,10,150,20); 
     lab5.setBounds(10,40,150,20); 
     lab2.setBounds(10,140,150,20); 
     t2.setBounds(130,140,150,20); 
     lab3.setBounds(10,170,150,20); 
     t3.setBounds(110,170,150,20); 
     lab4.setBounds(10,200,150,20); 
     t4.setBounds(150,200,150,20); 
     lab6.setBounds(10,240,150,20); 
     list.setBounds(50,270,150,20); 
     list.setSize(250,150); 
     b1.setBounds(250,470,150,20); 
     b2.setBounds(60,470,150,20); 
     b3.setBounds(160,470,150,20); 
     b1.setSize(60,30); 
     b2.setSize(75,30); 
     b3.setSize(65,30); 


     panel.add(lab); 
     panel.add(t1); 
     panel.add(lab5); 
     panel.add(lab2); 
     panel.add(t2); 
     panel.add(t3); 
     panel.add(t4); 
     panel.add(lab4); 
     panel.add(lab3); 
     panel.add(lab6); 
     panel.add(b1); 
     panel.add(b2); 
     panel.add(b3); 
     panel.add(list); 

     brief = new JLabel("Goodmorning "+t1+" Today is "+t2+" its your birthday You are now"+t3+" of age You are From"+t4); 
     getContentPane().add(panel); 


     b1.addActionListener(new ActionListener() 
     { 
      public void actionPerformed(ActionEvent a) 
      { 
       Object source = a.getSource(); 

       if(source == b1) 
       { 
        System.exit(0); 
       } 
      } 
     }); 

     b2.addActionListener(new ActionListener() 
     { 

      public void actionPerformed(ActionEvent a) 
      { 
       Object source = a.getSource(); 

       if(source == b2) 
       { 
        list = new JList(); 
       } 
      } 
     }); 
     b3.addActionListener(new ActionListener() 
     { 
      public void actionPerformed(ActionEvent a) 
      { 
       Object source = a.getSource(); 

       if(source == b3) 
       { 
        t1.setText(""); 
        t2.setText(""); 
        t3.setText(""); 
        t4.setText(""); 
       } 
      } 
     }); 
    }  

    public static void main(String args []) 
    { 
     vin w = new vin(); 

     w.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     w.setSize(400,600); 
     w.setVisible(true); 
    } 
} 

Answer 1

我修改了您的代碼，以便您的列表由您在按下「提交」按鈕時更新的矢量支持。

public class Frame extends JFrame 
{ 
     JLabel lab = new JLabel("Enter Your Name :"); 
     JLabel lab2 = new JLabel("Enter Your Birthday :"); 
     JLabel lab3 = new JLabel("Enter Your Age:"); 
     JLabel lab4 = new JLabel("Enter Your HomeTown:"); 
     JLabel lab5 = new JLabel("Choose Your Department:"); 
     JButton b1 = new JButton("Exit"); 
     JTextField t1 = new JTextField(15); 
     JTextField t2 = new JTextField(15); 
     JTextField t3 = new JTextField(15); 
     JTextField t4 = new JTextField(15); 
     JButton b2 = new JButton("Submit"); 
     JButton b3 = new JButton("Clear"); 
     JLabel lab6 = new JLabel("Message :"); 

     Vector vector = new Vector(); 
     JList list = new JList(vector); 

     JPanel panel = new JPanel(); 
     JLabel brief; 

    public Frame() 
    { 

     setLocation(500,280); 
     panel.setLayout(null); 


     lab.setBounds(10,10,150,20); 
     t1.setBounds(130,10,150,20); 
     lab5.setBounds(10,40,150,20); 
     lab2.setBounds(10,140,150,20); 
     t2.setBounds(130,140,150,20); 
     lab3.setBounds(10,170,150,20); 
     t3.setBounds(110,170,150,20); 
     lab4.setBounds(10,200,150,20); 
     t4.setBounds(150,200,150,20); 
     lab6.setBounds(10,240,150,20); 
     list.setBounds(50,270,150,20); 
     list.setSize(250,150); 
     b1.setBounds(250,470,150,20); 
     b2.setBounds(60,470,150,20); 
     b3.setBounds(160,470,150,20); 
     b1.setSize(60,30); 
     b2.setSize(75,30); 
     b3.setSize(65,30); 


     panel.add(lab); 
     panel.add(t1); 
     panel.add(lab5); 
     panel.add(lab2); 
     panel.add(t2); 
     panel.add(t3); 
     panel.add(t4); 
     panel.add(lab4); 
     panel.add(lab3); 
     panel.add(lab6); 
     panel.add(b1); 
     panel.add(b2); 
     panel.add(b3); 
     panel.add(list); 

     brief = new JLabel("Goodmorning "+t1+" Today is "+t2+" its your birthday You are now"+t3+" of age You are From"+t4); 
     getContentPane().add(panel); 


     b1.addActionListener(new ActionListener() 
     { 
      public void actionPerformed(ActionEvent a) 
      { 
       Object source = a.getSource(); 

       if(source == b1) 
       { 
        System.exit(0); 
       } 
      } 
     }); 

     b2.addActionListener(new ActionListener() 
     { 

      public void actionPerformed(ActionEvent a) 
      { 
       Object source = a.getSource(); 

       if(source == b2) 
       { 
        vector.add(t1.getText() + "-" + t2.getText() + "-" + t3.getText() + "-" + t4.getText()); 
        list.setListData(vector);          
        list.revalidate(); 
        list.repaint(); 
       } 
      } 
     }); 
     b3.addActionListener(new ActionListener() 
     { 
      public void actionPerformed(ActionEvent a) 
      { 
       Object source = a.getSource(); 

       if(source == b3) 
       { 
        t1.setText(""); 
        t2.setText(""); 
        t3.setText(""); 
        t4.setText(""); 
       } 
      } 
     }); 
    }  

    public static void main(String args []) 
    { 
     Frame w = new Frame(); 

     w.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     w.setSize(400,600); 
     w.setVisible(true); 
    } 
}