这是源码:package packagename;import javax.swing.*;
import java.awt.*;
import java.awt.event.*;public class HelloWorld extends JFrame
{
public HelloWorld(String titleText)
{
super(titleText);
addWindowListener(new WindowAdapter()
{
public void
windowClosing(WindowEvent e)
{
HelloWorld.this.dispose();
System.exit(0);
}
});
JLabel greeting = new JLabel("Hello World!", JLabel.CENTER);
getContentPane().add(greeting, BorderLayout.CENTER);
setSize(300, 100);
setVisible(true);
}
public static void main(String args[])
{
new HelloWorld("Hello World! Sample");
}
}
import java.awt.*;
import java.awt.event.*;public class HelloWorld extends JFrame
{
public HelloWorld(String titleText)
{
super(titleText);
addWindowListener(new WindowAdapter()
{
public void
windowClosing(WindowEvent e)
{
HelloWorld.this.dispose();
System.exit(0);
}
});
JLabel greeting = new JLabel("Hello World!", JLabel.CENTER);
getContentPane().add(greeting, BorderLayout.CENTER);
setSize(300, 100);
setVisible(true);
}
public static void main(String args[])
{
new HelloWorld("Hello World! Sample");
}
}
1.拷贝你的文件到一个 packagename目录。
2.编译你的文件 javac HelloWorld.java
3.回到上一级目录,执行你的文件 java packagename.HelloWorld