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How to create a simple example of java recursion

How to create java recursion: first create a clear recursion end condition; then set the judgment condition, the code is [private static int sumNum(int n){if (n == 1){return 1;}return n + sumNum(n- 1)}】.

Oct 23, 2020 am 11:39 AM

java

What is the principle of java reflection mechanism

Principle of Java reflection mechanism: 1. For any class, you can know all the properties and methods of this class, and for any object, you can call any of its methods; 2. Everything is an object, and classes are also objects; 3. When [Animal.class] is a file when it is on the hard disk. When it is loaded into the memory, it can be considered as an object.

Oct 23, 2020 am 11:04 AM

java reflection mechanism

What is the usage of java split()

Usage of java split(): 1. If "." is used as the separation, the necessary writing method is "String.split("\\.")"; 2. If "|" is used as the separation, the necessary writing method is "String.split("\\|")".

Oct 22, 2020 am 11:34 AM

java split() method

How to implement array initialization in java

Methods to implement array initialization in Java: 1. Dynamic initialization, format [data type [ ] array name = new data type [array length]]; 2. Static initialization, format [data type [ ] array name = new data type [ ] { Element 1, Element 2, Element 3...}].

Oct 22, 2020 am 10:52 AM

java Array initialization

Convenient statistical order income (1)

The java basic tutorial column will show you how to conveniently count order income.

Oct 21, 2020 pm 05:18 PM

How to call method of another class in java

Java calls a method of another class: 1. The class method is modified with static, and the code is [public static void sayStatic()]; 2. The method without static modification, the code is [public void sayInstance()].

Oct 21, 2020 am 10:56 AM

java

How to display java error information on the page

The method for displaying Java error information on the page: first customize the exception class; then throw the exception class in the service layer, and the controller class inherits the main exception class; then define the main exception class, in which you can write multiple self-defined exception classes; Finally complete the information code.

Oct 21, 2020 am 09:52 AM

java Error message Page display

Finally here...RocketMQ Literacy Chapter

The java basic tutorial column introduces the knowledge about RocketMQ in detail today.

Oct 20, 2020 pm 05:16 PM

rocketmq

Detailed jdk8 installation tutorial

How to install jdk8: first double-click the exe file and install it step by step according to the default settings; then right-click "This Computer-Properties-Advanced System Settings-Advanced-Environment Variables-New"; then create a new environment variable JAVA_HOME; finally configure the environment variables Path is enough.

Oct 20, 2020 pm 04:21 PM

jdk8

How to view java class files

How to view java class files: first download the [jd-gui] tool and unzip it; then in the tool interface that opens, click File and open File in the upper left corner; finally select to open the class file.

Oct 20, 2020 am 11:02 AM

class file java

Garbled code problem in java char array output

Solution to garbled output of java char array: initialization is required when declaring the array, the code is [char buf[] = new char[200];for(int i = 0; i < 200; i++){buf[i] = ' 0';｝】

Oct 20, 2020 am 10:50 AM

java

How many bytes does the boolean type occupy in Java?

The boolean type in Java occupies bytes: 1. 1 bit. The reason is that the value of the boolean type only has two logical values: true and false. After compilation, it will be represented by 1 and 0; 2. 1 byte. The reason is that although After compilation, 1 and 0 only occupy 1 bit of space, but the smallest unit of data processed by the computer is 1 byte.

Oct 20, 2020 am 10:43 AM

java

How many numbers does java int have?

Java int is 4 bytes, 32 bits. The value range of int is [-2^31-2^31-1], that is, [-2147483648-2147483647]. For positive numbers, its complement is Itself, for a negative number, its complement is the inversion of all the bits of the binary number of the corresponding positive number plus one.

Oct 20, 2020 am 10:37 AM

int java

How to convert Chinese garbled characters in Java

Method for converting java Chinese garbled code: first use the editor to write the java source file; then use [javac.exe] to compile the java file, and use JDK to write the compiled and saved information in the memory into the class file; finally run the compiled class .

Oct 20, 2020 am 10:26 AM

java Chinese garbled code