Java 编译错误:类 Appletprac 是公共的，应在名为 Appletprac.java 的文件中声明 [英] Java Compile Error: class Appletprac is public, should be declared in a file named Appletprac.java
问题描述
当我编译 java 程序时，我收到此错误:class Appletprac is public，应该在名为 Appletprac.java 的文件中声明
When I am compiling the java program I am getting this error: class Appletprac is public, should be declared in a file named Appletprac.java
这是我的java代码:
Here is my java code:
import java.applet.*;
import java.awt.*; // Graphics Class
import javax.swing.*;
import java.awt.event.*;
/*<applet code="Appletprac.class" width="500" height="500"> </applet>*/
public class Appletprac extends JApplet implements ActionListener
{
JButton OK;
JRadioButton Font_Style1,Font_Style2,Font_Style3;
ButtonGroup bg;
JCheckBox Font_Family_Name;
JTextField jt;
int i;
String s="";
public void init()
{
OK=new JButton("OK");
Font_Family_Name=new JCheckBox("Serif");
Font_Style1=new JRadioButton("Plain");
Font_Style2=new JRadioButton("Bold");
Font_Style3=new JRadioButton("BoldItalic");
bg=new ButtonGroup();
jt=new JTextField(20);
this.setLayout(new FlowLayout());
bg.add(Font_Style1);
bg.add(Font_Style2);
bg.add(Font_Style3);
this.add(jt);
this.add(OK);
this.add(Font_Family_Name);
this.add(Font_Style1);
this.add(Font_Style2);
this.add(Font_Style3);
OK.addActionListener(this);
Font_Style1.addActionListener(this);
Font_Style2.addActionListener(this);
Font_Style3.addActionListener(this);
}
public void start()
{}
public void stop()
{}
public void paint(Graphics g)
{
g.clearRect(50,50,500,300);
g.draw3DRect(50,50,500,300,false);
g.setFont(new Font(s,i,30));
g.setColor(Color.BLUE);
g.drawString(jt.getText(),100,100);
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==Font_Style1)
i=Font.PLAIN;
if(e.getSource()==Font_Style2)
i=Font.BOLD;
if(e.getSource()==Font_Style3)
{
i=Font.ITALIC;
int j=Font.BOLD;
i=i+j;
}
if(e.getSource()==Font_Family_Name || e.getSource()==OK)
{
if(Font_Family_Name.isSelected())
s="Serif";
else
s="Tall paul";
}
repaint();
}
}
推荐答案
Java 允许每个文件有一个公共类，公共类名应与文件名相同.对于您，您应该将文件名 Appletprac.java
Java allow one public class per file, and the public class name should be the same with the file name. For you , you should make the filename Appletprac.java
你可以看到这个链接 为什么文件名在Java和类名一样吗?
像这样写一个html文件:
Write a html file like this:
test.html
<html>
<applet
code = Appletprac.class
width = 200
height = 100>
</applet>
</html>
将编译好的.class文件放在同一个文件夹中，在cmd中输入appletviewer test.html.
Put the compiled .class file in the same folder, and input appletviewer test.html in the cmd.
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