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Java大数据面试复习30天冲刺 - 日积月累，每日五题【Day04】——JavaSE

创建线程有几种方式1.通过继承Thread类实现，实现简单但不可以继承其他类，多个线程之间无法共享该线程类的实例变量。2.实现Runnable接口，较继承Thread类，避免继承的局限性，适合资源共享。3.使用Callable，方法中可以有返回值，并且抛出异常。4.创建线程池实现，线程...

Java大数据面试复习30天冲刺 - 日积月累，每日五题【Day02】——JavaSE

接口和抽象类的区别是什么1.接口的方法默认是 public，所有方法在接口中不能有实现(Java 8 开始接口方法可以有默认实现），抽象类可以有非抽象的方法。2.接口中的实例变量默认是 final 类型的，而抽象类中则不一定。3.一个类可以实现多个接口，但最多只能实现一个抽象类。4.一个类实现接口的...

Java大数据面试复习30天冲刺 - 日积月累，每日五题【Day01】——JavaSE

1. 重载和重写的区别重载：发生在同一个类中，方法名必须相同，参数类型不同，个数不同，顺序不同，方法返回值和访问修饰符可以不同，发生在编译时。重写：发生在父子类中，方法名，参数列表必须相同，返回值范围小于等于父类，抛出的异常范...

Java大数据开发面试答疑

1、kafka 的 message 包括哪些信息一个 Kafka 的 Message 由一个固定长度的 header 和一个变长的消息体 body 组成header 部分由一个字节的 magic(文件格式)和四个字节的 CRC32(用于判断 body 消息体是否正常)构成。当 magic 的值为 1...

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