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How to implement merge sort using java

The core idea of using Java to implement merge sort is to merge two ordered sequences into a large ordered sequence. Merge sort uses recursion and divide-and-conquer techniques to divide the data sequence into smaller and smaller half sub-tables, then sorts the half sub-tables, and finally uses recursive methods to merge the sorted half sub-tables into increasingly larger ones. ordered sequence.

Mar 30, 2020 pm 04:25 PM

java 归并排序

Java persistence layer interview questions (2)

Java interview questions: Explain the role of namespace in MyBatis; what is the meaning of dynamic SQL in MyBatis; what are the shortcomings of JDBC programming, and how MyBatis solves these problems.

Mar 20, 2020 pm 06:17 PM

java 面试

How to implement string compression in java

This article comes from the Java Quick Start column. It introduces the method of string compression in Java. It has certain reference value and I hope it can help everyone. Implementation method: 1. Use double pointers for string compression; 2. Use HashMap for string compression.

Mar 17, 2020 pm 05:37 PM

java 字符串

Three ways to generate random numbers in java

The three methods for Java to generate random numbers are as follows: 1. Implemented through the Math.random() method; 2. Implemented by obtaining the number of milliseconds through the System.currentTimeMillis() method; 3. Implemented through the Random class.

Mar 16, 2020 pm 08:33 PM

java 随机数

Detailed explanation of how to use the private keyword in java

This article comes from the Java Quick Start column. It introduces how to use the private keyword. It has certain reference value and I hope it will be helpful to everyone. The private keyword cannot be assigned to external classes and interfaces.

Mar 13, 2020 pm 06:03 PM

java private

What file is hprof?

hprof is a memory image file of the java process, which contains detailed usage information of the memory heap. How to open the hprof file: first find the hprof file path as "java-virtual\java_pid2432.hprof"; then use the software "Analyzer" to open it .

Mar 02, 2020 am 09:52 AM

hprof

An explanation of classes and objects in java

This article comes from the Java Quick Start column. It explains the concepts of classes and objects in Java in detail with examples. I hope it can help you. The definition format of a class: [class ClassName{}], the format of creating a class object: [Person person = new person;].

Feb 25, 2020 pm 05:48 PM

java 类对象

How to print out a diamond pattern using java

The method to use Java to print out a diamond pattern is: 1. Nest multiple layers of loops and print in two parts; 2. The outer loop controls the number of rows, and the inner loop controls the number of columns.

Feb 24, 2020 pm 05:38 PM

java

Three uses of this keyword in java

This article comes from the Java introductory tutorial column. It shows you three uses of this keyword through examples. I hope it can help you. this is an object of its own, representing the object itself, which can be understood as: a pointer to the object itself.

Feb 20, 2020 pm 06:05 PM

java this

What is the default port of tomcat

The default port of tomcat is port 8080. How to modify the port number: first open the conf directory in the tomcat installation directory and find the "server.xml" file; then find the code "Connector port="8080"" and modify the port directly.

Feb 18, 2020 am 11:07 AM

tomcat

Implementation of common methods of Enum class in java

This article comes from the Java Quick Start column. This article introduces in detail the knowledge about the implementation of common methods of the Enum class in Java. I hope it can help you. Since the Enum class implements two interfaces, Comoarable and Serializable, enumeration types can use comparators and traversal operations.

Feb 14, 2020 pm 06:05 PM

java Enum

Introduction to java cross-platform principles

Java cross-platform principle: Java compiles a file (.java) into a bytecode file (.class), and then the bytecode is interpreted into machine code on the Java virtual machine. Bytecode (.class) files are not oriented to any specific platform, only to virtual machines.

Feb 13, 2020 pm 05:58 PM

java 跨平台

What is the difference between throws and try...catch in java?

This article comes from the java introductory tutorial column. It explains the difference between throws and try...catch in java through examples. I hope it can help you. Throws throws an exception and the subsequent code will not be executed, while try...catch throws the exception and continues to execute the following code.

Feb 12, 2020 pm 06:07 PM

java throws try...catch

How does HashMap work?

This article comes from the Java Quick Start column. It analyzes the working principle of hashmap in detail. I hope it can help you. HashMap is implemented based on the Hash algorithm. HashMap will obtain the hash value of the key based on the key.hashCode() method.

Feb 11, 2020 pm 06:05 PM

HashMap