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What is a jar file in java

The jar file in Java is a document format of Java. It is a file package similar to a zip file. Common classes are usually referenced during development and packaged for easy storage and management. From the customer's perspective, the .jar file is a kind of encapsulation.

Dec 03, 2019 pm 03:08 PM

java

How to implement java serialization

The implementation method of "java" serialization is: first implement the "Serializable" interface for the class that needs to be serialized, then use an output stream to construct an object stream object, and then use the "writeObject" method of the object stream to specify the " obj" object can be serialized.

Dec 03, 2019 pm 03:08 PM

java 序列化实现

What is the difference between java and android

The difference between java and Android: Android is the operating system of mainstream smartphones, and Java is a development language. Android is mainly developed in the direction of mobile Internet, and Java is mainly developed in the direction of software.

Dec 03, 2019 pm 02:57 PM

java

Introduction to the solution to Chinese garbled characters when reading files in Java

Solution to Chinese garbled characters when Java reads files: Specify the encoding method of the data stream as "UTF-8" in the InputStreamReader class when reading files in Java, which can solve the problem of Chinese garbled characters when Java reads files.

Dec 03, 2019 pm 02:38 PM

java

How to get the day of the week for a specified date in java

How to get the day of the week for a specified date in java: 1. Use the Calendar class to get the day of the week for the specified date. The week obtained by this method starts on Sunday. 2. Use the SimpleDateFormat class and pass in the parameter "EEEE" to get the day of the week.

Dec 03, 2019 pm 02:17 PM

java

How to instantiate in java?

Using an already defined class in Java, the process of creating an object of this class is called "instantiation". Method of instantiation: 1. Create an object using the new() method of the class to implement instantiation. 2. Use the clone method to create an object. 3. Use the Class.forName method to obtain the class, and then call the newinstance() method of the class.

Dec 03, 2019 pm 02:04 PM

java 实例化

Introduction to the method of judging whether it is English in java

How to determine whether a string is in English in java: 1. In java, you can use the regular expression "[a-zA-Z]+" to determine whether a string is all in English. 2. Use the regular expression ".*[a-zA-z].*" to determine whether the string contains English.

Dec 03, 2019 pm 01:52 PM

java

How to copy files in java?

How to copy files in java: 1. Use FileStreams to copy, use FileInputStream to read the bytes of file A, and use FileOutputStream to write to file B. 2. Use FileChannel to copy. 3. Use Commons IO replication.

Dec 03, 2019 pm 01:35 PM

java

How to determine whether a character is a number in java

How to determine whether a character is a number in java: 1. Use Character.isDigit(char) to determine. 2. Force the characters to be converted into numbers. If the input character is a number, it will return true. If an exception is thrown, it will return false. 3. Use regular expressions to judge.

Dec 03, 2019 pm 01:18 PM

java

What is java map?

Map in Java is an interface. It does not inherit any other interface. Map provides a storage collection of dual-column mappings, which can provide one-to-one data processing capabilities. The first column in the dual columns is called key. , the second column is value.

Dec 03, 2019 am 11:56 AM

java

Java method to determine whether it is a prime number (prime number)

How to determine whether it is a prime number (prime number) in java: first use the if(src%2==0) statement to determine whether it is an even number. If it is not an even number, use the for(int i=3;i<=sqrt;i+=2) statement Use the src%i statement to judge. If it cannot be divided evenly, it is a prime number.

Dec 03, 2019 am 11:35 AM

java

Solution to garbled characters in java when running cmd

Solution to garbled characters in java when running cmd: 1. Use the -encoding parameter to specify the encoding method when using the command in cmd to run the java file. 2. Add the "AVA_TOOL_OPTIONS" variable to the system variables of the environment variables and set the encoding format.

Dec 03, 2019 am 11:19 AM

java

Introduction to solutions to garbled file names in Java downloads

Solution to garbled java download file name: 1. Use the URLEncoder.encode() method to UTF8 encode the filename, and the file name will be converted to Unicode encoding. 2. Convert the file name to ISO8859-1 encoding through the byte conversion method.

Dec 03, 2019 am 10:53 AM

java

Introduction to rsa garbled characters in java

When using rsa for encryption and decryption in Java without encoding, the problem of Chinese garbled characters will occur. Solution: When using rsa encryption or decryption, use the String.getBytes() method to transcode the encrypted or decrypted content.

Dec 03, 2019 am 10:43 AM

java