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Understanding the concept of caching in java

The cache in Java refers to the buffer for data exchange. When a certain piece of hardware wants to read data, it will first query the data from the cache and execute it directly. If it does not exist, it will get it from the memory.

Nov 12, 2019 pm 04:51 PM

java concept understand cache

Eclipse cannot create java virtual machine

Solution to the inability to create a virtual machine: 1. Open the eclipse.ini file in the eclipse directory; 2. Modify the –launcher.XXMaxPermSize property; 3. Modify it to 128m, save and restart.

Nov 12, 2019 pm 04:35 PM

java

What is static in java? How to understand?

Static (static) in Java is a keyword mainly used to create domain variables or methods that are independent of specific objects. If a member variable is shared by all objects, then the member variable should be defined as a static variable.

Nov 12, 2019 pm 04:34 PM

java What understand static

The file name downloaded by java is garbled

Solution to the garbled file name downloaded by java: 1. Use URLEncoder for encoding for the IE browser core; 2. Use getBytes for non-IE browsers to transcode; 3. Change tomcat and eclipse encoding to utf-8.

Nov 12, 2019 pm 04:19 PM

java

What software is written in java

Software written in Java includes: 1. Eclipse and IDEA programming software; 2. Games include "Minecraft"; 3. Big data storage software includes Hadoop and Elasticsearch; 4. Most Android applications are also developed using Java; 5. Enterprise management application software and so on.

Nov 12, 2019 pm 04:04 PM

java software

What are the design patterns in Java?

The design patterns in Java include: Strategy pattern, Agent pattern, Singleton pattern, Multiple instance pattern, Factory method pattern, Abstract factory pattern, Facade pattern, Adapter pattern, Template method pattern, Builder pattern, Bridge pattern, and Command pattern.

Nov 12, 2019 pm 03:53 PM

java Which Design Patterns

What are the exceptions in java

Java exceptions include: 1. Null pointer exception; 2. Mathematical operator exception; 3. Array subscript out-of-bounds exception; 4. Access permission exception; 5. Method parameter exception; 6. Specified class does not exist exception, etc.

Nov 12, 2019 pm 03:44 PM

java abnormal

Examples of sorting methods in java

To implement sorting in Java, you can move the largest element in the sequence to be sorted to the end in each pass, and the remainder is the new sequence to be sorted. Repeat this step until all elements are sorted.

Nov 12, 2019 pm 03:36 PM

java Example

What are the commonly used libraries in Java?

Commonly used class libraries in Java include: 1. The java.lang package is the most commonly used. The classes in the package can design basic Java programs; 2. The java.awt package can provide methods for creating graphical interfaces, including buttons, text boxes and lists. Box, etc.; 3. The java.io package provides system input and output control, etc.

Nov 12, 2019 pm 03:15 PM

java Library

How to understand the concept of packages in Java

Packages in Java are containers of classes, used to separate class name spaces. If no package name is specified, all programs belong to a default unnamed package. The package mechanism in Java can prevent duplicate class names in one space.

Nov 12, 2019 pm 03:04 PM

java Bag concept understand

The difference between method overloading and overriding in java

The difference between method overloading and overwriting in Java is: method overloading occurs when two or more methods in the same class have the same method name but different parameters, while method overwriting is used by subclasses to redefine parent class methods. Case.

Nov 12, 2019 pm 02:50 PM

java the difference cover Overload

How to define a class in java

The method of defining a class in Java: first write the keyword class, followed by the class name, indicating that this is a class; then define member variables and member methods inside the class. The member variables are outside the method, and there is no static before the member method.

Nov 12, 2019 pm 02:38 PM

java Define class

The difference between characters and bytes in java

The difference between characters and bytes in Java is: characters are semantic units, and characters are encoded. One character can be encoded into 1 or more bytes; bytes are the basic data type in Java, used to declare characters. Section type variable.

Nov 12, 2019 pm 02:37 PM

java the difference character byte

How to determine whether it is a number in java

Java's way to determine whether it is a number: first write a try catch statement to catch the exception; then force the character to be converted to a number in the try statement; finally, the program does not catch the exception, indicating that it is a number.

Nov 12, 2019 pm 02:08 PM

java