java编译环境有问题_java：用JCeator编译器，编译出现问题怎么解决？

用Jcreator编译如下代码&＃xff1a;(代码没有错误)

1 import java.util.*;2

3 public classaa4 {5 public static double trianglearea(double a,double b,doublec)6 throwsNotTriAngleException,NegativeArgementsException{7 //判定a,b,c是否全为正数

8 if(a <0 || b <0 || c <0)9 throw newNegativeArgementsException();10 //判定a,b,c是否能构成三角形

11 if(a&＃43;b<&＃61;c || b&＃43;c<&＃61;a || a&＃43;c<&＃61;b)12 throw newNotTriAngleException();13

14 //计算三角形面积

15 double m &＃61; (a&＃43;b&＃43;c)/2.0;16 doubles;17 s &＃61; Math.sqrt(m*(m-a)*(m-b)*(m-c));18 returns;19

20 }21

22 public static voidmain(String[] args)23 {24 doublea,b,c;25 intN;26 Scanner sc&＃61; newScanner(System.in);27 N &＃61;sc.nextInt();28 for(int i&＃61;0;i

39 }40 catch(NegativeArgementsException q){41

42 }43 }44 }45 }46

47 class NotTriAngleException extendsException48 {49 NotTriAngleException()50 {51 System.out.println("Not TriAngle");52 }53 }54

55 class NegativeArgementsException extendsException56 {57 NegativeArgementsException()58 {59 System.out.println("Negative Argements");60 }61 }

编译时出现如下错误&＃xff1a;

F:\java学习\aa.java:6: 不兼容的类型

找到&＃xff1a; NotTriAngleException

需要&＃xff1a; java.lang.Throwable

throws NotTriAngleException,NegativeArgementsException{

^

F:\java学习\aa.java:6: 不兼容的类型

找到&＃xff1a; NegativeArgementsException

需要&＃xff1a; java.lang.Throwable

throws NotTriAngleException,NegativeArgementsException{

^

F:\java学习\aa.java:9: 不兼容的类型

找到&＃xff1a; NegativeArgementsException

需要&＃xff1a; java.lang.Throwable

throw new NegativeArgementsException();

^

F:\java学习\aa.java:12: 不兼容的类型

找到&＃xff1a; NotTriAngleException

需要&＃xff1a; java.lang.Throwable

throw new NotTriAngleException();

^

F:\java学习\aa.java:37: 不兼容的类型

找到&＃xff1a; NotTriAngleException

需要&＃xff1a; java.lang.Throwable

catch(NotTriAngleException q){

^

F:\java学习\aa.java:40: 不兼容的类型

找到&＃xff1a; NegativeArgementsException

需要&＃xff1a; java.lang.Throwable

catch(NegativeArgementsException q){

^

6 错误

Process completed.

运行时错误有&＃xff1a;

java.lang.NoClassDefFoundError: aa

Caused by: java.lang.ClassNotFoundException: aa

at java.net.URLClassLoader$1.run(URLClassLoader.java:200)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:188)

at java.lang.ClassLoader.loadClass(ClassLoader.java:307)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)

at java.lang.ClassLoader.loadClass(ClassLoader.java:252)

at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)

Could not find the main class: aa. Program will exit.

Exception in thread "main"

Process completed.

请求高手解决&＃xff0c;代码没有问题&＃xff0c;不知道是编译器&＃xff0c;还是环境问题。

求解决方法。(用的编译器为JCreator)