core java questions

Summary of Baidu Java R D questions and java R D questions 1. Analysis of Common application scenarios in singleton mode. Among the 23 design modes, the singleton mode is the largest. It is easy to understand, but applicable to scenarios. Are you really familiar with this? The use of Singleton is because there is no

Typical Java questions> long-term updates and typical java questions 1. The array is rotated 90 degrees clockwise. 1 2 // The array rotates 90 ° clockwise. 3 // The column changes to the row (positive 0 column --> 0 row, 1 column --> 1 row ...) 4 // change the row column (the opposite is 0 rows --> length-1 column, 1 r

Concise answers to several java interview questions, concise java interview questions The difference between equal and = in java: The equal method is used to compare object references unless it is overwritten (such as String class and basic type package class. And ==except f

[Java core technology volume I (the ninth edition of the original book)] Chapter 1 collection, the ninth edition of core technology This chapter describes how to use the Java class library to help us implement the traditional data structure in programming. Here, we only introduce how to use the collection classes in t

10 classic Java interview questions and classic java questions 1. How does Java's HashMap work? HashMap is a key value for the data structure. Each key has a corresponding value. The key is to identify such a value. Based on the hashing principle, HashMap stores and obtains objects through put () and get () methods.

Multi-thread (concurrency) for Java from single-core to multi-core)Java's parallel programming is complicated and I cannot understand it deeply. However, due to the need to train the classifier in parallel recently, I thought about it. please correct me if you have any errors. This is just a general introduction. Many problems can be solved using sequential progr

, the following about the IOC description error in the spring feature is ()A,ioc means that the relationship between programs is manipulated directly by the program code.B, the so-called "control reversal" refers to the transfer of control from the application code to the external container, that is, the control rightC,IOC the responsibility of controlling the creation into the framework, separating from the application codeD, when using the spring IOC container, only the objects required by the