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What is recursion

This article introduces you to the relevant knowledge of recursion, I hope it can help you.

Sep 29, 2020 pm 03:58 PM

递归

Explain in detail the difference between equals and ==

This article provides a detailed analysis of the difference between equals and ==, which has certain reference value. I hope it can help everyone. == is to determine whether two variables or instances point to the same memory space, and equals is to determine whether the values of the memory spaces pointed to by two variables or instances are the same.

Sep 28, 2020 pm 04:17 PM

equals ==

Implement a simple poker game using java

Define five People playing a poker game. The gameplay is that each of the five people draws 4 cards from a deck of playing cards without a king. There are four types of cards: ♥, ♣, ♠, ♦. The size of the cards ranges from 1 to 13.

Sep 18, 2020 pm 04:56 PM

java 扑克牌

How to save the string data in the arraylist collection into a text file

The method of saving the string data in the arraylist collection in a text file: first traverse the ArrayList collection to obtain the data; then store the data in the text file.

Sep 17, 2020 pm 05:13 PM

arraylist 集合字符串数据

What does [...] in java mean?

[...] in Java represents variable-length parameters, which means that any number of parameters of this type can be passed in at this position.

Sep 15, 2020 pm 05:20 PM

java

Java uses a two-dimensional array to print Yang Hui's triangle

Java introductory tutorial: This article shares with you the method of printing Yang Hui's triangle using a two-dimensional array. It has certain reference value and I hope it can help everyone.

Sep 14, 2020 am 11:08 AM

java 二维数组杨辉三角

Java implements copying list

This article introduces the method of copying list in Java. It has certain reference value and I hope it can help everyone.

Sep 11, 2020 pm 03:51 PM

java list

Java implements a tool class to determine whether the IP is in the specified IP range

Java introductory tutorial: This article shares with you a tool class to determine whether the IP is within the specified IP range. It has certain reference value and I hope it can help everyone. Idea: Use ip and the values at both ends of the ip range to call the ipIsValid method.

Sep 10, 2020 pm 05:45 PM

java ip 工具类

Java implements file upload and download functions

This article introduces how to implement the file upload and download functions. It has certain reference value and I hope it can help everyone.

Sep 08, 2020 pm 05:53 PM

java 文件

How to find numbers that appear only once in an integer array

How to find numbers that appear only once in an integer array: We can use the HashMap method. The keys in the HashMap store the numbers in the array, and the values store the number of occurrences of the values in the array.

Sep 07, 2020 pm 05:50 PM

数组数字

How to determine the number of palindromes in java

This article introduces the method of judging the number of palindromes, which has certain reference value. I hope it can help everyone. You can first invert the number; then determine whether the two are equal.

Sep 03, 2020 pm 04:14 PM

java 回文数

Use java to implement a verification code function

This article shares with you the Java code to implement the verification code function. It has certain reference value and I hope it can help everyone. Use the Graphics class to draw letters on the artboard, randomly select a certain number of letters to generate randomly, and then randomly generate several interference lines on the artboard.

Sep 02, 2020 pm 03:55 PM

java 验证码

What are the characteristics and functions of the finally keyword in java

Getting started with java: This article introduces you to the characteristics and functions of the finally keyword in java. It has certain reference value and I hope it can help you. The characteristic of the finally keyword is: the statement body controlled by the finally keyword will definitely be executed.

Sep 01, 2020 pm 04:00 PM

java finaly

What is the difference between the super keyword and this keyword in java

this is an object of its own, representing the object itself, which can be understood as: a pointer to the object itself. super can be understood as a pointer to its own super (parent) class object, and this super class refers to the parent class closest to itself.

Aug 31, 2020 pm 04:40 PM

java super this