Java

BASE64 Encryption and decryption PackageCom.stone.util; Importjava.io.UnsupportedEncodingException; ImportSun.misc.*; Public classBase64 {//Encrypt Public Staticstring getBase64 (String str) {byte[] B =NULL; String s=NULL; Try{b= Str.getbytes ("

Design patterns have always played an important role in the software industry. Recently feel that their knowledge of design patterns have been forgotten, although I have seen a lot, but frankly speaking, actually did not understand. Basic or to meet

Note: This article is based on JDK 1.71 overviewJava provides a rich collection framework that contains many interfaces, virtual classes, and implementation classes. These interfaces and classes provide rich functionality to meet basic aggregation

My Leetcode defeated the 90% trip, which was mainly done using the Java implementation algorithm to reach the 10% camp. This is the second add two Numbers All code Download:GitHub Link: GitHub link, click Surprise;Writing articles is not

Package com.eduask.circulationdemo;/* * * 1. Output of 100--200 that cannot be divisible by 3, Output */public class TestDemo01 {public static void m per four newline Ain (string[] args) {int j = 0;for (int i=100; iOperation Result:100  101  103  104

A simple example1 Public void Testnum () {2 System.out.println (Math.Round (12.5)); 3 System.out.println (Math.Round ( -12.5)); 4 }56 output:137 -12The output is determined by theThe rounding rules of the

URLs and URLConnection classesURLs in the network (Uniform Resource Locator) are abbreviations for Uniform Resource locators. It represents the address of a resource on the Internet. Through the URL we can access various network resources on the

In Java thread concurrency processing, there is a very big confusion about the use of a keyword volatile, for the use of this keyword, in the multi-threaded concurrent processing can be all right.The Java language is multi-threaded, and in order to

Transferred from: http://www.cnblogs.com/aigongsi/archive/2012/04/01/2429166.htmlIn Java thread concurrency processing, there is a very big confusion about the use of a keyword volatile, for the use of this keyword, in the multi-threaded concurrent

01. What is proxy mode?　　Resolution: Proxy: The primary role of proxy mode is to provide a proxy for other objects to control access to this object. In some cases, an object does not want or cannot directly reference another object.The proxy object

Jdk:java develpment Kit-java Development KitJre:java Runtime Environment-java Operating environmentJvm:java Virtual Machine-java VMJdk=jre+java Development Tools (Java.exe, Javac.exe ... ）In a nutshell: Java programs developed with the JDK are

Topic:Counts the number of numbers and strings in a string, and arranges them separately, requiring1. Numbers, strings can be obtained from the keyboard.2. Store in List3. Number of statistics, number of strings4. Output numbers and strings in order

Sometimes it is useful to force a cycle to be repeated early. That is, you may want to continue running the loop, but ignore the statement that repeats the remaining loop body.The continue statement is a complement to the break statement.In the

There are three main things to use in Java Keywords: data, methods, classes.Final data:We need to keep the data constant when we need a value that will never change and that is not expected to change when the runtime is initialized.For a

Do not understand what is called the callback, every day listen to people say add a callback method What, my heart think I grass, what is called callback method ah? And then I find it on the Internet Ah find, find a lot is not very clear, now know,

The Split function in Java is not the same as the Split function in JS.In Java, we can use split to split a string into a specified delimiter, and then return an array of strings, followed by an example of string.split usage and considerations:Split

JAVA CallBack mechanism (callback) details, CallBack callback Preface I recently learned about java and came into contact with the CallBack mechanism (CallBack ). At first glance, I felt quite confused, and I found some explanations on the Internet.

Java notes-basic thread knowledgePreface A process is an instance of a program in execution. It is an independent unit for the operating system to allocate and schedule resources. A thread is a single program control flow in a process and the basic

Algorithm basics-Java and Python implementation of the eight classical sorting algorithmsThere is no need to talk about the eight sorting algorithms. The programmer's algorithm basics must be mastered. Now Let's sum up to deepen the memory. Is the

Java Lock-another Implementation of Synchronization Usually Junior programmers like to use the synchronized keyword to implement synchronization mechanism. The reason is simple. It is simple to use. We don't need to consider more details and have