书上的源代码:(java 2应用程序简介第15页)没有import javax.swing.*; //====================Hello4.java================ import javax.swing.JOptionPane; public class Hello4 { public static void main(String args[]) { JOptionPane.showMessageDialob(null,"Hello!\nJava!") System.exit(0); } } 就剩hello4.java:2:class javax.swing.joptionpane not found in import.一个错误了 加上 import javax.swing.*; 一样报错
拼写错误,showMessageDialob应为showMessageDialogimport javax.swing.JOptionPane; public class Hello4 { public static void main(String args[]) { JOptionPane.showMessageDialog(null,"Hello!\nJava!"); System.exit(0); } }
都改了,还是不行,谁能建一个文件帮我试试. //====================Hello4.java================ import javax.swing.*; import javax.swing.JOptionPane; public class Hello4 { public static void main(String args[]) { JOptionPane.showMessageDialog(null,"Hello!\nJava!"); System.exit(0); } } 提示:Package javax.swing not found in import.
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import javax.swing.*;
import javax.swing.*;
应该写 import javax.swing.JOptionPanejava.lang.Object
|
+--java.awt.Component
|
+--java.awt.Container
|
+--javax.swing.JComponent
|
+--javax.swing.JOptionPane
//====================Hello4.java================
import javax.swing.JOptionPane;
public class Hello4
{
public static void main(String args[])
{
JOptionPane.showMessageDialob(null,"Hello!\nJava!")
System.exit(0);
}
}
就剩hello4.java:2:class javax.swing.joptionpane not found in import.一个错误了
加上
import javax.swing.*;
一样报错
要么你干脆用import jave.swing.* ;
掉了分号
public class Hello4
{
public static void main(String args[])
{
JOptionPane.showMessageDialog(null,"Hello!\nJava!");
System.exit(0);
}
}
//====================Hello4.java================
import javax.swing.*;
import javax.swing.JOptionPane;
public class Hello4
{
public static void main(String args[])
{
JOptionPane.showMessageDialog(null,"Hello!\nJava!");
System.exit(0);
}
}
提示:Package javax.swing not found in import.
建议你重新安装一个版本高的jdk.现在大家都用jdk1.4了.
可能是你的版本低吧.版本区分有awt 和swing 的分别,
可能就是这里的错误!
awt 和swing 我装哪个?