JAVA异常

java

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!");
   }

}

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