java - 有没有办法在 public static void main(string args[]) 中不使用 static ？

Question

套装挥杆训练；

import static java.awt.Color.BLACK;
import java.awt.GridBagConstraints;
import static java.awt.GridBagConstraints.CENTER;
import static java.awt.GridBagConstraints.NORTH;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.LayoutManager;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class JFrameTest extends JFrame{

public JFrameTest(){

    setSize(800,800);
    setTitle("Hello :D");
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setLocationRelativeTo(null);
    setResizable(true);
    setVisible(true);

}

public class GridBagLayoutTest extends GridBagLayout{

        public GridBagLayoutTest(){

        setLayout(new GridBagLayout());

        };

};

public static class JPanelTest extends JPanel{

        public JPanelTest() {

        setBackground(BLACK);
        setOpaque(true);      

    }

}          



public static class JButtonTest extends JButton{

          public JButtonTest(){



          };

        };



public void main(String args[]){

        java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
        JFrameTest T = new JFrameTest();
        JPanelTest Jp1 = new JPanelTest();
        JButtonTest Jb1 = new JButtonTest();
        GridBagLayoutTest Gb1 = new GridBagLayoutTest();
        GridBagConstraints c = new GridBagConstraints();

        c.ipadx = 100;
        c.ipady = 100;
        c.gridheight = 1;
        c.gridwidth = 1;
        c.weightx = 1;
        c.weighty = 1;
        c.insets = (new Insets(0,0,0,500));

        Jb1.setLayout((LayoutManager) c);
        T.add(Jp1);
        Jp1.add(Jb1);


        }
    });   

}  

}

编译这个时，我收到一条消息，说我没有 main 方法。如果我将 main 方法设置为静态，则无法在 run() 中使用layoutManager，所以我想知道如何完成此传递。或者，也许是让layoutManager在此实例中工作的另一种方法。

Answer 1

正如评论中已经指出的，不，如果没有具有该确切签名的 main 方法，您将无法执行 java 类。

public static void main(String args[])

我已经清理了一些你的代码。它仍然是您的代码，但更整洁。 每次您需要特定背景或其他内容时，无需子类化 JPanel、JButton 或 GridBagLayout。只需实例化原始类并使用其已定义的方法来设置其属性即可。

   import java.awt.Color;     // no static import needed
   import java.awt.GridBagConstraints;
   import java.awt.GridBagLayout;
   import java.awt.Insets;

   import javax.swing.JButton;
   import javax.swing.JFrame;
   import javax.swing.JPanel;
   import javax.swing.SwingUtilities;

   public class JFrameTest extends JFrame {

       public JFrameTest() {

       setSize(800,800);
       setTitle("Hello :D");
       setDefaultCloseOperation(EXIT_ON_CLOSE);
       setLocationRelativeTo(null);
       setResizable(true);

       initComponents();  // <- Include your components in the main frame

       setVisible(true);

  }

  private void initComponents() {

      // Use meaningful names for your variables
      // Respect Java naming conventions. No variable name start with a capital letter.         
      JPanel panel = new JPanel();
      panel.setBackground(Color.BLACK);    
      panel.setOpaque(true);
      panel.setLayout(new GridBagLayout()); // no need for static access

      JButton button = new JButton();

      GridBagConstraints gbc = new GridBagConstraints(); // this is not a Layout. It represents constrains to be used in the GribBagLayout on adding an element
      gbc.ipadx = 100;
      gbc.ipady = 100;
      gbc.gridheight = 1;
      gbc.gridwidth = 1;
      gbc.weightx = 1;
      gbc.weighty = 1;
      gbc.insets = (new Insets(0,0,0,500));

      panel.add(button, gbc);
      add(panel);   // <- this.add(panel) where this is your instance of JFrameTest

   }


 public static void main(String args[]){

        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new JFrameTest();
        }
    });   

 }  
}