JAVA异常

JAVA异常

AccountNotFoundException类

package com.blueleson.hello;
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public class AccountNotFoundException extends Exception {
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   public AccountNotFoundException(String message) {
       super(message);
   }
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   @Override
   public String getMessage() {
       return "账号未找到";
   }
}

login类

package com.blueleson.hello;?public class User {    public void login(String account,String password)            throws AccountNotFoundException {        boolean accountExisted = false; // 默认帐号不存在        String otherPassword;        // 此处可插入查询帐号的代码        if (accountExisted) { // 如果帐号不存在，抛出异常，程序中断            throw new AccountNotFoundException(account);       }   }    public static void main(String[] args) {        User user = new User();        try {            user.login("account","password");       } catch (AccountNotFoundException e) {            //插入处理帐号不存在的代码            System.out.println(e.getMessage());            System.exit(-1);       }        //插入登陆成功的代码        System.out.println("登陆成功！");   }?}