java.lang.NoSuchMethodError: main
Exception in thread "main"
Process completed.我用 Jcreator 4总是出现这个问题
如果用 Jcreator 3就不会
原因 ?
比如说 class A{ public static void main (String [] args)
}
一定要a.class跟文件A.java 相同吗 class Employee
{
int allowancenumber;
String name;
String honor;
String branch;
Employee(int a,String n,String h,String b){
this.allowancenumber=a;
this.name=n;
this.honor=h;
this.branch=b;
}
void display()
{}
} class Manager extends Employee
{
int allowance;
int total;
Manager(int a,String n,String h,String b,int all , int tot)
{
super(a,n,h,b);
this.allowance=all;
this.total=tot;
}
void display()
{
System.out.println("yuangongxinxi"+allowancenumber+name+honor+branch+allowance+total);
}
}
class Secretary extends Employee
{
String addname ;
Secretary(int a,String n,String h,String b,String add)
{
super(a,n,h,b);
this.addname=add;
}
void display(){ System.out.println("yuangongxinxi"+allowancenumber+name+honor+branch+addname);
}
}
class MacketManager extends Employee
{
int allowance;
int total;
String area;
MacketManager(int a,String n,String h,String b,int all , int tot,String area)
{
super(a,n,h,b);
this.allowance=all;
this.total=tot;
this.area=area;
}
void dipslay()
{
System.out.println("yuangongxinxi"+allowancenumber+name+honor+branch+allowance+total+area); }
}
class Em
{ public static void main(String args[])
{
Employee e = new Employee( 10001 ,"bbb" , "22121","bbbb") ;
e.display() ;
System.out.println() ;
System.out.println() ;
Manager m1 = new Manager(10002,"bdd","br","bbddd",2000,20) ;
m1.display() ;
System.out.println() ;
System.out.println() ;
Secretary s1 = new Secretary(10004,"clj","a","a","Boss") ;
s1.display() ;
System.out.println() ;
System.out.println() ;
MacketManager mm1 =new MacketManager(10006,"huangyiming","pppp","aaaa",2000 , 20,"zhonghua") ;
mm1.display() ;
System.out.println() ;
System.out.println() ;
}}
要用 Employee.java 为文件名,还是 Em.java 在 Employee.java一定要加public吗
Exception in thread "main"
Process completed.我用 Jcreator 4总是出现这个问题
如果用 Jcreator 3就不会
原因 ?
比如说 class A{ public static void main (String [] args)
}
一定要a.class跟文件A.java 相同吗 class Employee
{
int allowancenumber;
String name;
String honor;
String branch;
Employee(int a,String n,String h,String b){
this.allowancenumber=a;
this.name=n;
this.honor=h;
this.branch=b;
}
void display()
{}
} class Manager extends Employee
{
int allowance;
int total;
Manager(int a,String n,String h,String b,int all , int tot)
{
super(a,n,h,b);
this.allowance=all;
this.total=tot;
}
void display()
{
System.out.println("yuangongxinxi"+allowancenumber+name+honor+branch+allowance+total);
}
}
class Secretary extends Employee
{
String addname ;
Secretary(int a,String n,String h,String b,String add)
{
super(a,n,h,b);
this.addname=add;
}
void display(){ System.out.println("yuangongxinxi"+allowancenumber+name+honor+branch+addname);
}
}
class MacketManager extends Employee
{
int allowance;
int total;
String area;
MacketManager(int a,String n,String h,String b,int all , int tot,String area)
{
super(a,n,h,b);
this.allowance=all;
this.total=tot;
this.area=area;
}
void dipslay()
{
System.out.println("yuangongxinxi"+allowancenumber+name+honor+branch+allowance+total+area); }
}
class Em
{ public static void main(String args[])
{
Employee e = new Employee( 10001 ,"bbb" , "22121","bbbb") ;
e.display() ;
System.out.println() ;
System.out.println() ;
Manager m1 = new Manager(10002,"bdd","br","bbddd",2000,20) ;
m1.display() ;
System.out.println() ;
System.out.println() ;
Secretary s1 = new Secretary(10004,"clj","a","a","Boss") ;
s1.display() ;
System.out.println() ;
System.out.println() ;
MacketManager mm1 =new MacketManager(10006,"huangyiming","pppp","aaaa",2000 , 20,"zhonghua") ;
mm1.display() ;
System.out.println() ;
System.out.println() ;
}}
要用 Employee.java 为文件名,还是 Em.java 在 Employee.java一定要加public吗
解决方案 »
- 新手学java 用cmd编译, 还是用netbeans/eclipse?
- C/S项目架构设计----求助
- 两个JTABLE问题...
- 一个关于Graph的题目
- 标准MD5是不是有好几个版本 还是只有一个版本?
- 请教一个引用自定义包的问题:
- 如何屏蔽Java Applet Window提示
- JFrame关闭后里面的函数为什么还在执行
- 至急: ps = conn.prepareStatement(str2)前,ps是否一定要close??????
- 请问那位朋友有web shpere的相关资料,要中文的!!不知能否给兄弟一份,重谢!!!!
- 请教:如何让窗口定位在自己想要的位置
- 关于java的GUI设计提问,很急呀
文件名要用加了public的那个类名
否则,可以随意但,运行时(java ClassName)要用真实的类名
...............................
这个是肯定的。
解释时 必须与类名相同
应用程序中 除非在主类名前可使用public 若在其他类前使用 编译将出错