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How to determine whether a file is empty in java

How to determine whether a file is empty in Java: There is no method in the File class to determine whether a file is empty, but you can use the return value of the length() method to determine. If the file does not exist or the file is empty, the length() method returns 0.

Dec 02, 2019 pm 01:42 PM

java

what is java serialization

Java serialization is the process of converting Java objects into byte sequences. Serialization is a mechanism used to process object streams. The so-called object stream is to stream the contents of objects. The streamed objects can be read and written, and the streamed objects can also be transmitted between networks.

Dec 02, 2019 pm 01:30 PM

java

Introduction to the causes and solutions of Java zip compression garbled characters

Reason: The encoding used for compressed files in the API that comes with jdk is different from the encoding format used by the operating system when processing zip compressed files, causing the compressed files to be garbled. Solution: The solution that can be adopted is to implement zip compression by using a third-party API to solve the problem of zip compression garbled characters.

Dec 02, 2019 pm 01:20 PM

java

How to package java files?

Java file packaging steps: 1. Right-click on the project and select Export. 2. Select JAR file under java. 3. Select the project and then select the path to the jar file package. 4. Click Next and Finish in sequence to complete packaging of the java file.

Dec 02, 2019 am 11:47 AM

java

Java determines whether a string is a legal date

How to determine whether a string is a legal date in Java: Use the SimpleDateFormat class to set the specified date format, and then use the setLenient(false) method to strictly parse the date. If the date is unqualified, an exception will be thrown.

Dec 02, 2019 am 11:27 AM

java

Introduction to solving string garbled characters in Java

Solution to string garbled characters in java: Use the java.lang.String.getBytes(String charsetName) and str.getBytes(charsetName) methods in java to change the string encoding to solve the garbled characters.

Dec 02, 2019 am 11:10 AM

java Garbled characters

Introduction to the method of determining whether a directory exists in java

How to determine whether a directory exists in java: first use the exists() method to determine whether the file or directory exists, and then use the isDirectory() method to detect whether the object is a folder. If so, it returns true, otherwise it returns false.

Dec 02, 2019 am 10:57 AM

java

Java determines whether a string is a number

How to determine whether a string is a number in Java: 1. Loop through the string, and then use isDigit() to determine whether the characters in the string are numbers one by one. 2. Use regular expressions to determine whether a string is a number. 3. Determine whether it is a number through the ASCII code of the number.

Dec 02, 2019 am 10:41 AM

java

Java error The system cannot find the specified file Causes and solutions

Java error The reason why the system cannot find the specified file: It may be caused by the incorrect file name or file extension set in Java. Solution: Check whether the file name is correct or check whether the file suffix is ??correct.

Dec 02, 2019 am 10:28 AM

java

Introduction to solutions to Java compilation garbled code

Solution to Java compilation garbled code: 1. Use the javac -encoding utf-8 command instead of javac when compiling. 2. Add a new JAVA_TOOL_OPTIONS to the system variables in the computer environment variables with the value "-Dfile.encoding=UTF-8".

Dec 02, 2019 am 10:14 AM

java

Java import new project garbled solution

Solution to garbled characters when java imports new projects: 1. Right-click properties on the project, select Resource, and change the Text file encoding settings. 2. In the IDE, find Text file encoding in Window and set the encoding format.

Dec 02, 2019 am 10:02 AM

java

Solutions to garbled characters when reading java files

Solution to garbled characters when reading java files: first set the encoding format of the text file to be read to UTF-8, and then use the InputStreamReader class to read the file when java reads the file. This class can specify the character set when reading the file. , just specify the character set as UTF-8.

Dec 02, 2019 am 09:47 AM

java Garbled characters

What does '=' in java mean?

"=" in Java is the assignment operator, which is used to assign the return value of the expression on the right side of the operator to the variable on the left or a final-modified variable. The left side of "=" is a variable, or a final-modified variable, and the right side can be any expression (the type of the returned value must be compatible with the one on the left).

Dec 02, 2019 am 09:37 AM

java

How to make fonts display underline in java

You can use the TextAttribute class in Java to set the font to display underline. Use the UNDERLINE_ON value in this class to set the standard underline. The TextAttribute instance is used as an attribute key and can be used to identify attributes in the class of text processing attributes.

Dec 02, 2019 am 09:27 AM

java Underline