JAVA异常

JAVA异常

AccountNotFoundException类

package com.blueleson.hello;
​
public class AccountNotFoundException extends Exception {
​
   public AccountNotFoundException(String message) {
       super(message);
   }
​
   @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！");
   }
​
}