我如何顯示在JTextarea或JTable

Question

所以我創建了兩個按鈕，我想單擊按鈕時執行特定的任務。如果使用ActionListener單擊按鈕1（b1），我想創建一個Van對象並在JTextarea或JTable中顯示實例變量。例如，如果單擊Van按鈕，則該操作將創建Van的對象並獲取實例變量值並將其打印在JTextArea/JTable中。下面是我到目前爲止的代碼：

import java.awt.Color; 
import java.awt.FlowLayout; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.JTable; 


public class TestButton extends JFrame{ 

JTable table; 

public TestButton(){ 

    setLayout(new FlowLayout()); 
} 
static class ActionTwo implements ActionListener{ 

    @Override 
    public void actionPerformed (ActionEvent evt){ 

     Vehicle sport = new Sportcar (200, 1500, 220); 

    } 
    } 

    static class Action implements ActionListener{ 

    @Override 
    public void actionPerformed (ActionEvent evt){ 

     Vehicle aVan = new Van(100,0.9,3500,160.4); 


    } 

    } 

    public static void main (String [] args){ 

    JFrame frame = new JFrame ("Type of Vehicle"); 
    frame.setVisible(true); 
    frame.setSize(400,200); 
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    frame.setLocationRelativeTo(null); 
    JPanel panel = new JPanel(); 
    panel.setBackground(Color.black); 
    JButton b1 = new JButton("Van"); 
    JButton b2 = new JButton("Sports Car"); 
    panel.add(b1); 
    panel.add(b2); 
    frame.add(panel); 
    b1.addActionListener(new Action()); 
    b2.addActionListener(new ActionTwo()); 

    } 




    } 

Answer 1

看一看在Java tutorial on Action Listeners

這會你想它做什麼，但你應該通過教程閱讀來獲得所發生的事情十足的把握。

public static void main (String [] args){ 
    JTextField text = new JTextField(); 
    ActionListener textSetter = new ActionListener() { 

     @Override 
     public void actionPerformed(ActionEvent e) { 
      JButton clicked = (JButton) e.getSource(); 
      text.setText(clicked.getText()); 
     } 
    }; 

    JButton btnVan = new JButton("Van"); 
    btnVan.addActionListener(textSetter); 
    JButton btnCar = new JButton("Sports Car"); 
    btnCar.addActionListener(textSetter); 

    JPanel btnPanel = new JPanel(); 
    btnPanel.add(btnVan); 
    btnPanel.add(btnCar); 

    JPanel mainPanel = new JPanel(new BorderLayout()); 
    mainPanel.add(text, BorderLayout.NORTH); 
    mainPanel.add(btnPanel, BorderLayout.SOUTH); 

    JFrame frame = new JFrame ("Type of Vehicle"); 
    frame.add(mainPanel); 
    frame.setSize(400,200); 
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    frame.setLocationRelativeTo(null); 
    frame.setVisible(true); 
}