Question

我有两个不同的类（mainClass）和（visual）。在可视类中，我有一个方法，在方法内，我将所需的代码放入了简单的JButton中。在主类中，我创建了一个对象以从可视类中调用方法，以在主类中显示按钮。但这行不通。我将不胜感激。

package init;

import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JButton;

public class mainClass {

    private JFrame frame;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    mainClass window = new mainClass();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });

    }

    /**
     * Create the application.
     */
    public mainClass() {
        initialize();
    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {
        frame = new JFrame();
        frame.setBounds(100, 100, 450, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(null);


 In the code below I made an object and called the method from the visual class

        visual bt = new visual();
        bt.btn();

    }

}

//////////////// VISUAL CLASS ///////////////////////

package init;

import javax.swing.JButton;
import javax.swing.JFrame;

public class visual {
    public JFrame frame;

    public void btn() {

        JButton btnNewButton = new JButton("New button");
        btnNewButton.setBounds(141, 155, 151, 45);
        frame.getContentPane().add(btnNewButton);

    }


}

Answer 1

对于您要在此处实现的目标，您不需要2个课程。您可以这样做：

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

public class MainClass {

  /**
   * Launch the application.
   */
  public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
      public void run() {
        try {

          JFrame frame = new JFrame();
          frame.setBounds(100, 100, 450, 300);
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

          JButton btnNewButton = new JButton("New button");
          frame.getContentPane().setLayout(new FlowLayout());
          frame.getContentPane().add(btnNewButton);
          frame.setVisible(true);

        } catch (Exception e) {
          e.printStackTrace();
        }
      }
    });
  }
}

将按钮和文本字段从另一个类导入到主类

1 个答案: