我是初学者,但我一直在处理这个未知问题。请查看我已编码的这个简单程序,并解释它为什么不能编译我。问题是我已经从老师那里复制了这段代码,并且在他的机器上工作正常。然后,当我试图在我的机器上运行这个例子时,我得到了13个错误!简单程序停止编译过程中的Java错误,请帮忙
这是第一类:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class radio extends JFrame{
private JTextField tf;
private Font pf;
private Font bf;
private Font itf;
private Font bif;
private JRadioButton pb;
private JRadioButton bb;
private JRadioButton ib;
private JRadioButton bib;
private ButtonGroup group;
public radio(){
super("raido buttonseses");
setLayout(new FlowLayout());
tf = new JTextField("buggedy buggedy boo", 25);
add(tf);
pb = new JRadioButton("plain", true);
bb = new JRadioButton("bold", false);
ib = new JRadioButton("italic", false);
bib = new JRadioButton("bold and italic", false);
add(pb);
add(bb);
add(ib);
add(bib);
group = new ButtonGroup();
group.add(pb);
group.add(bb);
group.add(ib);
group.add(bib);
pf = new Font("Serif", Font.PLAIN, 14);
bf = new Font("Serif", Font.BOLD, 14);
itf = new Font("Serif", Font.ITALIC, 14);
bif = new Font("Serif", Font.BOLD + Font.ITALIC, 14);
tf.setFont(pf);
//wait for event to happen pass in font obj to constructor
pb.addItemListener(new HandlerClass(pf));
bb.addItemListener(new HandlerClass(bf));
ib.addItemListener(new HandlerClass(itf));
bib.addItemListener(new HandlerClass(bif));
}
private class HandlerClass implements ItemListener{
private Font font;
// font obj gets variable font
public HandlerClass(Font f){
font = f;
}
//sets font to font obj that was passed in
public void itemStateChanged(ItemEvent event){
tf.setFont(font);
}
}
}
当年这里是我一直在试图运行第二个主类:
import javax.swing.JFrame;
public class radiobutton{
public static void main(String[] args) {
radio go = new radio();
go.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
go.setSize(300,200);
go.setVisible(true);
}
}
我知道有人在看着这个和思考的答案是如此明显,但对于像我这样的初学者来说,这不是很清楚。下面是当我尝试编译,我又回到了我的错误:
javac radiobutton.java
./JFrame.java:1: JFrame is already defined in this compilation unit
import javax.swing.JFrame;
^
radiobutton.java:7: cannot find symbol
symbol : method setDefaultCloseOperation(int)
location: class radio
go.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
^
radiobutton.java:8: cannot find symbol
symbol : method setSize(int,int)
location: class radio
go.setSize(300,200);
^
radiobutton.java:9: cannot find symbol
symbol : method setVisible(boolean)
location: class radio
go.setVisible(true);
^
./JFrame.java:8: cannot find symbol
symbol : variable EXIT_ON_CLOSE
location: class JFrame
go.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
^
./radio.java:19: cannot find symbol
symbol : constructor JFrame(java.lang.String)
location: class JFrame
super("raido buttonseses");
^
./radio.java:20: cannot find symbol
symbol : method setLayout(java.awt.FlowLayout)
location: class radio
setLayout(new FlowLayout());
^
./radio.java:22: cannot find symbol
symbol : class JTExtField
location: class radio
tf = new JTExtField("buggedy buggedy boo", 25);
^
./radio.java:23: cannot find symbol
symbol : method add(javax.swing.JTextField)
location: class radio
add(tf);
^
./radio.java:30: cannot find symbol
symbol : method add(javax.swing.JRadioButton)
location: class radio
add(pb);
^
./radio.java:31: cannot find symbol
symbol : method add(javax.swing.JRadioButton)
location: class radio
add(bb);
^
./radio.java:32: cannot find symbol
symbol : method add(javax.swing.JRadioButton)
location: class radio
add(ib);
^
./radio.java:33: cannot find symbol
symbol : method add(javax.swing.JRadioButton)
location: class radio
add(bib);
^
13 errors
我的猜测是,这事做在的Java函数进口的星号。我在正确的轨道上吗?感谢您看看这个愚蠢的问题,并非常感谢任何帮助。
它完美地编译对我来说,尝试运行Java的版本,告诉我们输出 – 2010-11-04 07:06:38