**在 ArrayList 的中间或开头插入元素,**当我们向 ArrayList 的中间或开头插入元素时,需要将插入位置之后的所有元素都向后移动一位,以腾出空间给新元素。因此,该操作的时间复杂度是 O(n)。 插入的时候,如果底层数组大小不够,就会发生扩容:构造ArrayList的时候,默认的底层数组大小是10,不够的话就动态扩容,扩容的...
进程隔离性:每个进程都有自己独立的内存空间,当一个进程崩溃时,其内存空间会被操作系统回收,不会影响其他进程的内存空间。这种进程间的隔离性保证了一个进程崩溃不会直接影响其他进程的执行。 进程独立性:每个进程都是独立运行的,它们之间不会共享资源,如文件、网络连接等。因此,一个进程的崩溃通常不会对其他进程的...
Integer sum = 0; for(int i=1000; i<5000; i++){ sum+=i; } 上面的代码sum+=i可以看成sum = sum + i,但是+这个操作符不适用于Integer对象,首先sum进行自动拆箱操作,进行数值相加操作,最后发生自动装箱操作转换成Integer对象。其内部变化如下...
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Please refer earlier question for these rules. - If a class field is not used in equals(), you should not use it in hashCode() method. - Best practice for user defined key class is to make it immutable, so that hashCode() value can be cached for fast performance. Also immutable ...
The class should follow the rules associated with equals() and hashCode() for all instances. Please refer earlier question for these rules. If a class field is not used in equals(), you should not use it in hashCode() method. Best practice for user defined key class is to make it immu...
Here are some Java coding interview questions that cover a range of topics from front-end to back-end development: Q1. What are the main features of Java? Ans. Java is known for its simplicity, object-oriented nature, platform independence, security, and robustness. Understanding these features...
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Waiting/Blocked:In this state, a thread is not running but still alive, or it is waiting for the other thread to finish. Dead/Terminated:A thread is in terminated or dead state when the run() method exits. Differentiate between the Thread class and Runnable interface for creating a Thread...