java拆分源文件

Question

我是新来的java，我有两个类（类calc和按钮），我需要拆分成单独的文件和类calc使用类按钮。他们都编译，但是当我运行类A失败。我怎样才能做到这一点？

这是类钙代码

package start; 
import javax.swing.*; 
import java.awt.event.*; 
import java.awt.Container; 
import java.awt.Insets; 
import java.awt.Dimension; 
import button.*; 

public class calc { 
private button calc_buttons; 

private static void creategui(){ 
    JFrame window = new JFrame("hello dynamic window"); 

    buttons.createbuttons(); 
    buttons.setOpaque(false); 
    window.setContentPane(buttons); 
    window.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); 
    window.pack(); 
    window.setVisible(true); 

} 

static public void main(String[] args){ 
    creategui(); 
} 

} 

这是类按钮

package button; 

import javax.swing.*; 
import java.awt.event.*; 
import java.awt.Container; 
import java.awt.Insets; 
import java.awt.Dimension; 

public class button /*extends JPanel implements ActionListener*/{ 

protected static JButton button1, button2, button3, button4, button5, button6, button7; 
protected static JButton button8, button9, button_fact, button_exp, button_sqrt, button_abs; 
protected static JButton button_sin, button_cos, button_tan, button_percent, button_rcl; 
protected static JButton button_MC, button_e, button_pi, button_Mplus, button_Mminus; 
protected static JButton button_C, button_AC, button_MS, button_sign; 
protected static JButton button_plus, button_minus, button_div, button_mult, button_equal; 

static public void calc_button(){ 


} 

} 

代码我编译时没有错误消息，但是当我运行计算类我得到这个

Exception in thread "main" java.lang.NoClassDefFoundError: calc (wrong name: start/calc) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632) at java.lang.ClassLoader.defineClass(ClassLoader.java:616) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) at java.net.URLClassLoader.access$000(URLClassLoader.java:58) at java.net.URLClassLoader$1.run(URLClassLoader.java:197) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:248)

Answer 1

向上移动一个目录（进入包含“开始”和“按钮”的目录）并执行此操作：

java start.calc 

顺便说一句，这是一个让大家的名字以大写字母开头的约定。