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Exceptions in java you must know

An exception is a problem that prevents the current method or scope from continuing to execute. The reason why Java proposes an exception handling mechanism is to tell developers that something is abnormal in your program, please pay attention. This article introduces the exception handling mechanism in Java in detail.

Nov 29, 2019 pm 05:21 PM

java

The principle of Java dynamic proxy

The emergence of Java's dynamic proxy mechanism allows Java developers to dynamically obtain proxy classes without manually writing proxy classes. They can simply specify a set of interfaces and delegate class objects. This article explains in detail the principle of dynamic proxy in java.

Nov 29, 2019 pm 05:06 PM

Java

String identity judgment in java

This article introduces the identity judgment of strings in Java from the java introductory column. I hope it can help you. "==" can only handle the identity judgment of corresponding values of basic data types, and is not applicable to reference data types. In the Object class, the equals method is used to compare whether the references of two objects are equal.

Nov 29, 2019 pm 03:29 PM

java 字符串恒等

Sharing some questions about loop structures in java

This article shares with you some common questions during the learning cycle, hoping to help students in need. The examples below demonstrate the problem-solving process for everyone, and also provide ideas for solving the problems. I hope you will read it carefully.

Nov 29, 2019 pm 02:20 PM

java 循环结构

Detailed explanation of java regular knowledge

Regular expressions define patterns of strings. Regular expressions can be used to search, edit or manipulate text. A string is actually a simple regular expression. This article introduces the meaning of various components of regular expressions in Java.

Nov 29, 2019 pm 01:11 PM

java

Summary of methods to determine whether an object is empty in Java

There are three ways to determine whether an object is empty in "java", namely: 1. Traverse the object according to "for...in", if it exists, return "true", otherwise return "false"; 2. Use "ES6" Use "Object.keys()" to judge; 3. Use JSON's own method to judge.

Nov 29, 2019 am 11:57 AM

java 判断对象为空方法

How to prevent duplicate elements in list collection in java

The method in "java" to make the elements in the "list" collection non-repeating is: first define a "list" object, then add several repeated elements through the "add" method, then instantiate an "ArrayList" object, and finally judge by traversing Just assign it to another "list" collection.

Nov 29, 2019 am 11:30 AM

java list集合元素不重复

Java page garbled solution

Solutions to garbled java pages: 1. The garbled page submitted to tomcat can be solved by configuring the encoding format in tomcat/conf/server.xml. 2. If the JSP page is garbled, just use the "String(byte[],decode)" method at the beginning of the page to specify the encoding format.

Nov 29, 2019 am 11:27 AM

java

How to write an interface and implement it in java

The way to define an interface and implement it in "java" is: the definition format is "interface interface name [extends other interface names] {variable declaration abstract method}". The interface implementation needs to use the "implements" keyword, and generally all of it needs to be implemented. method, otherwise it needs to be marked as an abstract class.

Nov 29, 2019 am 11:14 AM

java 接口实现

Introduction to solutions to garbled characters in the Java console

Solution to garbled characters in java console: 1. Eclipse console: Select "Run Configuration" - "Common" - "Console Encoding" - "UTF-8" in the menu. 2. cmd: execute the chcp 65001 command.

Nov 29, 2019 am 11:00 AM

java

Garbled characters appear when java decompresses zip package

The solution to garbled characters when decompressing "java" "zip" packages is: first determine whether the file to be decompressed exists or whether the path is correct, then determine whether the path exists, if not, create the path, then determine whether the compressed file is legal, and finally set The file name can be encoded as "GBK".

Nov 29, 2019 am 10:57 AM

java 解压 zip包乱码

Java error not found symbol solution (referencing custom class)

Solution to the error "symbol not found" when java references a custom class: 1. Compile the referenced class first, and then add the name of the folder where the file is located in the command to compile the java file. 2. Add the javac -classpath (cp) parameter when compiling the java file.

Nov 29, 2019 am 10:51 AM

java

Reasons and solutions for garbled characters exported from java to excel

Reason for garbled code: httpheader requires that the exported content must be encoded in iso8859-1. Solution: When exporting Excel from Java, convert the content encoding to "iso8859-1" encoding, and use the String(byte[],decode) method to transcode.

Nov 29, 2019 am 10:37 AM

java

Introduction to the method of determining whether a variable is a number in java

How to determine whether a variable is a number in Java: 1. Use the regular expression "[0-9]*" to determine. 2. Use the isDigit() function to determine. 3. Use org.apache.commons.lang to judge. 4. Determine whether the variable is a number by judging the ASCII code value.

Nov 29, 2019 am 10:24 AM

java