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How to implement java multithreading

Methods to implement multi-threading in java: 1. By inheriting the Thread class. 2. By implementing the Runnable interface. 3. Implement multi-threading by implementing the Callable interface. 4. Use thread pool to implement multi-threading.

Dec 04, 2019 am 11:06 AM

java

How to enter numbers in java

How to input numbers in Java: Java's Scanner class provides methods such as nextInt (used to read integers), nexFloat (read single-precision floating-point numbers), nextDouble (read double-precision floating-point numbers), etc., which can be used like C language Scanf reads numbers of a specified type.

Dec 04, 2019 am 10:52 AM

java

Introduction to the solution to garbled csv exported by java

Solution to garbled CSV exported by Java: Files exported in CSV mode do not contain BOM information by default. This problem can be solved by setting the BOM identifier (byte stream starting with EF BB BF) for the content to be output.

Dec 04, 2019 am 10:41 AM

java

What are the commonly used data types in Java?

There are four and eight commonly used data types in Java, namely: integer types: byte, short, int, and long. Floating point type: float, double. Logical type: boolean (it has only two possible values: true false). Character type: char.

Dec 04, 2019 am 10:32 AM

java

Where is java installed?

The default installation path for 32-bit Java is C:\Program Files(x86)\Java, and the 64-bit installation path is C:\Program Files\Java. You can use the java -verbose command in cmd to view the java installation path.

Dec 04, 2019 am 10:14 AM

java

How to read files in java?

Methods of reading files in java: 1. RandomAccessFile method (random reading). 2. FileInputStream method (io ordinary input stream). 3. Buffer buffer reading (based on nio Buffer and FileChannel reading). 4. Memory mapped reading.

Dec 04, 2019 am 10:01 AM

java

What are java modifiers?

Java modifiers are used to define classes, methods or variables, and are usually placed at the front of the statement. The Java language provides many modifiers, mainly divided into two types: access modifiers and non-access modifiers. This article introduces 11 types of modifiers in Java.

Dec 04, 2019 am 09:52 AM

java 修饰符

Solution to garbled file name when exporting excel using java

Solution to the garbled file name when exporting Excel from Java: 1. Use the URLEncoder.encode() method to transcode the Excel file name in browsers such as IE. 2. Use byte stream transcoding to transcode the Excel file in the Firefox browser.

Dec 04, 2019 am 09:23 AM

java

How to determine whether a certain value exists in a string array in java

The method to determine whether a value exists in a string array in "java" is: first, you can use the "asList" method in the "Arrays" class to convert the array into a "List" list, and then further use the "contains" method to determine the characters Just check whether a certain value exists in the string array.

Dec 03, 2019 pm 05:54 PM

java 字符串数组存在值

Immutable classes in java and their creation rules

An immutable class in "java" means that a class cannot be reassigned after it is instantiated. The creation rules are: 1. Use the "private" and "final" keywords to modify member variables; 2. Provide a constructor with parameters to initialize member variables; 3. Do not provide a "setter" method for member variables.

Dec 03, 2019 pm 04:57 PM

java 不可变类创建规则

Java method to determine whether it is a legal date

How to determine whether a date is a legal date in Java: first use the SimpleDateFormat class to define the date format, and then use format.setLenient(false) to strictly control the date conversion. Unconventional formats become illegal.

Dec 03, 2019 pm 04:16 PM

java

Detailed explanation of the solution to garbled file names in Java downloads

Solution to the garbled file name of java download: 1. Use the URLEncoder.encode() method in the IE browser to set the file name encoding to "UTF-8". 2. Set the file name encoding in Firefox by setting the byte stream encoding.

Dec 03, 2019 pm 03:49 PM

java

How to inherit a class in java

In the Java language, the inheritance of an implementation class uses the extends keyword, and the format of the inherited class is: [public] class SubClass extends SuperClass {definition of the class body}.

Dec 03, 2019 pm 03:33 PM

java

How to run jar package in java?

How to run a jar package in java: Add Main-Class:test.someClassName in the MANIFEST.MF of the jar package, and then enter the java -jar test.jar command in the console to run the jar.

Dec 03, 2019 pm 03:24 PM

java