最小的Java程序应该如何？

Question

我写了下面的代码：

import java.awt.*; 
import java.awt.event.*; 

class Party { 
    public void buildInvite() { 
     Frame f = new Frame(); 
     Label l = new Label("Party at Tim's"); 
     Button b = new Button("You bet"); 
     Button c = new Button("Shoot me"); 
     Panel p = new Panel(); 
     p.add(l); 
    } //more code here... 
} 

我不断收到以下错误：Exception in thread "main" java.lang.NoSuchMethodError: main

我试图附加main (String[] args)添加到代码，但我仍然得到同样的错误。

还有什么我应该放在代码和布局应该去哪里？

Answer 1

确保您main方法是这样的：

public static void main(String[] args) { 
    ... 
} 

Answer 2

初学者使用Java和Swing应该看看Oracle tutorial。这里是他们的Swing Hello World program：

package start; 

import javax.swing.*;   

public class HelloWorldSwing { 
    /** 
    * Create the GUI and show it. For thread safety, 
    * this method should be invoked from the 
    * event-dispatching thread. 
    */ 
    private static void createAndShowGUI() { 
     //Create and set up the window. 
     JFrame frame = new JFrame("HelloWorldSwing"); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

     //Add the ubiquitous "Hello World" label. 
     JLabel label = new JLabel("Hello World"); 
     frame.getContentPane().add(label); 

     //Display the window. 
     frame.pack(); 
     frame.setVisible(true); 
    } 

    public static void main(String[] args) { 
     //Schedule a job for the event-dispatching thread: 
     //creating and showing this application's GUI. 
     javax.swing.SwingUtilities.invokeLater(new Runnable() { 
      public void run() { 
       createAndShowGUI(); 
      }});}}