马士兵老师的源代码,在我朋友机子上可以通过,在我的机子上可以编译,只是一运行就出现
Exception in thread "main" java.lang.NoClassDefFoundError :TFMath
请问大家这要怎么解决!!谢谢!!!import java.awt.*;
import java.awt.event.*;public class TFMath {
public static void main(String[] args) {
new TFFrame().launchFrame();
}
}class TFFrame extends Frame {
TextField num1, num2, num3;
public void launchFrame() {
num1 = new TextField(10);
num2 = new TextField(10);
num3 = new TextField(15);
Label lblPlus = new Label("+");
Button btnEqual = new Button("=");
btnEqual.addActionListener(new MyMonitor());
setLayout(new FlowLayout());
add(num1);
add(lblPlus);
add(num2);
add(btnEqual);
add(num3);
pack();
setVisible(true);
}
private class MyMonitor implements ActionListener {
public void actionPerformed(ActionEvent e) {
int n1 = Integer.parseInt(num1.getText());
int n2 = Integer.parseInt(num2.getText());
num3.setText("" + (n1+n2));
}
}
}
//class MyMonitor implements ActionListener {
//TextField num1, num2, num3;
/*
public MyMonitor(TextField num1, TextField num2, TextField num3) {
this.num1 = num1;
this.num2 = num2;
this.num3 = num3;
}
*/
/*
TFFrame tf = null;
public MyMonitor(TFFrame tf) {
this.tf = tf;
}
public void actionPerformed(ActionEvent e) {
int n1 = Integer.parseInt(tf.num1.getText());
int n2 = Integer.parseInt(tf.num2.getText());
tf.num3.setText("" + (n1+n2));
}
}*/
Exception in thread "main" java.lang.NoClassDefFoundError :TFMath
请问大家这要怎么解决!!谢谢!!!import java.awt.*;
import java.awt.event.*;public class TFMath {
public static void main(String[] args) {
new TFFrame().launchFrame();
}
}class TFFrame extends Frame {
TextField num1, num2, num3;
public void launchFrame() {
num1 = new TextField(10);
num2 = new TextField(10);
num3 = new TextField(15);
Label lblPlus = new Label("+");
Button btnEqual = new Button("=");
btnEqual.addActionListener(new MyMonitor());
setLayout(new FlowLayout());
add(num1);
add(lblPlus);
add(num2);
add(btnEqual);
add(num3);
pack();
setVisible(true);
}
private class MyMonitor implements ActionListener {
public void actionPerformed(ActionEvent e) {
int n1 = Integer.parseInt(num1.getText());
int n2 = Integer.parseInt(num2.getText());
num3.setText("" + (n1+n2));
}
}
}
//class MyMonitor implements ActionListener {
//TextField num1, num2, num3;
/*
public MyMonitor(TextField num1, TextField num2, TextField num3) {
this.num1 = num1;
this.num2 = num2;
this.num3 = num3;
}
*/
/*
TFFrame tf = null;
public MyMonitor(TFFrame tf) {
this.tf = tf;
}
public void actionPerformed(ActionEvent e) {
int n1 = Integer.parseInt(tf.num1.getText());
int n2 = Integer.parseInt(tf.num2.getText());
tf.num3.setText("" + (n1+n2));
}
}*/
不是路劲问题
就是JRE了要不你重新装下JRE看看
再设置下classpath
1.右击“我的电脑”,打开“属性”,选择“高级”里面的“环境变量”。在新打开的界面中系统变量需要设置三个属性。在没安装过JDK的电脑中path属性是本来存在的。2.点击“新建”,然后变量名写上"java_home",顾名思义就是java的安装路径,然后在变量值写上刚才的安装路径,如"c:\Program Files\Java\jdk1.6.0"。3.在系统变量里找到path,点击编辑。path的含义就是系统在任何路径下都可以识别java命令。添加变量值";%java_home%\bin;%java_home%\jre\bin"。(其中"%java_home%"的意思是刚才设置的java_home的值)4.点击“新建”,然后变量名写上"classpath",该变量的含义为java加载类(bin or lib)的路径,只有类在classpath中,java命令才能识别。其值为".;%java_home%\lib;%java_home%\lib\tools.jar"(要加圆点.表示当前路径)。5.验证是否安装成功。点击“开始”->“运行”,输入"cmd",进入命令行界面,打入"java -version",如果安装成功,则系统显示 java version "1.6.0"
他没有写X时的时间代码把
1.环境没配好;
2.没有javac TFM.java就直接java TFM或者TFM.java,会报Exception in thread "main" java.lang.NoClassDefFoundError :TFMath ;
3.即使javac TFM.java了,楼主还是输入java TFM.java,同上错误;
javac这个倒不是很...重要吧,可能还是classPATH配置问题了,实在不行重新配遍
2)classpath是否设置.,代表当前目录
classpath=d:\java\jdk1.5\bin;.;
如果连这个都跑不动,那你电脑的智商也就够上幼儿园的了。
要不就是classpath没配好
偶的程序是、
import javax.swing.*;public class AdditionTutor{
public static void main(String[] args){
int number1=(int)(System.currentTimeMillis()%10);
int number2=(int)(System.currentTimeMillis()*7%10);
String answerString=JOptionPane.showInputDialog
("What is "+number1+"+"+number2+" ?");
int answer=Integer.parseInt(answerString);
JOptionPane.showMessageDialog(null,
number1+"+"+number2+"="+answer+"is"+
(number1+number2==answer));
}
}声明下,我已经生成.class 文件了
纠结!