動作偵聽器：在Java中

Question

發送文本輸入到一個對象，我不知道如何將文本輸入發送到對象在Java中，從按下使用​​方法的接口上的按鈕。

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

public class Preassessment extends javax.swing.JFrame implements ActionListener { 
    static JTextField concept = new JTextField(15); 
    JButton enter = new JButton("Enter"); 
    JLabel conceptLabel = new JLabel("Concept: "); 


    public Preassessment() { 
     super("Preassessment Sys"); 
     setSize(350, 180); 
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
     JPanel pane = new JPanel();   
     pane.add(conceptLabel); 
     pane.add(concept); 
     pane.add(enter); 
     add(pane); 
     enter.addActionListener(this); 
     setVisible(true);    
    } 

    public void actionPerformed(ActionEvent event) { 
     if(event.getSource() == enter){ 
      conceptLabel.setText(concept.getText());     
     } 
    } 

    public static void main(String[] arguments) { 
     Preassessment preassess = new Preassessment(); 
     Preassessment agInterface = new Preassessment(); //object to receive the text   
    } 
} 

Answer 1

您的問題沒有具體的不夠。在任何情況下，您需要在代碼中的某處參考targetobject，因此一種方法是：

public class Preassessment extends javax.swing.JFrame implements ActionListener { 
    static JTextField concept = new JTextField(15); 
    JButton enter = new JButton("Enter"); 
    JLabel conceptLabel = new JLabel("Concept: "); 


    public Preassessment(ActionListener listener) { 
     super("Preassessment Sys"); 
     setSize(350, 180); 
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
     JPanel pane = new JPanel();   
     pane.add(conceptLabel); 
     pane.add(concept); 
     pane.add(enter); 
     add(pane); 
     enter.addActionListener(listener); 
     setVisible(true);    
    } 

    public void actionPerformed(ActionEvent event) { 
     if(event.getSource() == enter){ 
      conceptLabel.setText(concept.getText());     
     } 
    } 

    public static void main(String[] arguments) { 
     Preassessment agInterface = new Preassessment(); //object to receive the text 
     Preassessment preassess = new Preassessment(agInterface);  
    } 
}