动作侦听器：将文本输入发送到Java中的对象

Question

I don't know how to send a text input to an object in Java, from a button pressed on an interface using the action Listener() method.

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

Your question is not concrete enough. In any case you need a reference to the targetobject somewhere in your code, so one way to do it is:

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);       
    }
}