使用throw进行用户定义的异常

cod*_*005 0 java exception throw

以下是"throw use;"显示错误的代码.为什么?如何将throw用于用户定义的异常?举个例子?

class use extends Exception{
public String toString() {
    return "too many exceptions";
}
}   
class user{
public static void main(String s[]) {
    int i=3;
    try {
        if(i>1)
            throw use;
    }
    catch(use e) {
        System.out.println(e.toString());
    }
    finally{
        System.out.println("program executed successfully!");
    }

}
}
Run Code Online (Sandbox Code Playgroud)

jlo*_*rdo 6

你需要一个异常类的实例来抛出它:

throw new use();
Run Code Online (Sandbox Code Playgroud)

要么

use a = new use();
throw a;
Run Code Online (Sandbox Code Playgroud)

将来请遵循Java命名约定,它将使您的代码更具可读性.(类名应以大写字母开头).