在 Java 中出错，不知道我做错了什么
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Getting error in Java, Have no idea what I'm doing wrong
提问by user3552670
I'm new to Java and I was trying to do the following on eclipse:
我是 Java 新手，我试图在 Eclipse 上执行以下操作：
import javax.swing.*;
public class Hello_World {
public class HelloWorld extends JFrame
{
public static void main(String[] args) {
JFrame frame = new HelloWorld();
frame.setSize( 300, 200 );
frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
frame.setTitle( "Hello world" );
frame.setVisible( true );
}
}
}
I have no idea what I doing wrong here. The compiler gives me following error:
我不知道我在这里做错了什么。编译器给了我以下错误：
Main method not found in class Hello_World, please define the main method as:
public static void main(String[] args)
or a JavaFX application class must extend javafx.application.Application
Can someone tell me what I'm doing wrong?
有人能告诉我我做错了什么吗？
采纳答案by merlin2011
The compiler is complaining because you have defined your mainmethod inside a nested class, instead of directly in the class that you are compiling.
编译器抱怨是因为您main在嵌套类中定义了您的方法，而不是直接在您正在编译的类中定义。
Just move the mainmethod into the HelloWorldclass.
只需将main方法移动到HelloWorld类中即可。
import javax.swing.*;
public class Hello_World {
public static class HelloWorld extends JFrame
{
}
public static void main(String[] args) {
JFrame frame = new HelloWorld();
frame.setSize( 300, 200 );
frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
frame.setTitle( "Hello world" );
frame.setVisible( true );
}
}
回答by user6325799
Here is a better solution:
这是一个更好的解决方案：
package hello_world;
import javax.swing.*;
public class Hello_World extends JFrame {
public static void main(String[] args) {
JFrame frame = new Hello_World();
frame.setSize( 300, 200 );
frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
frame.setTitle( "Hello world" );
frame.setVisible( true );
}
}
