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- Difference between Java constructors and normal methods
- The difference between Java constructors and ordinary methods: 1. The name of the constructor must be exactly the same as the class name and there is no return type; 2. There must be a constructor in the class; 3. The constructor cannot be static, final, synchronized, abstract and native modification.
- Javagetting Started 13520 2020-05-30 11:29:14
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- How to check java version
- How to check the Java version: First open the [Start] menu in the lower left corner of the computer, find the [Run] option, and click to open; then enter the "cmd" command in the pop-up run dialog box; finally enter the command "Java -version" and click Return You can check the java version by clicking on the car.
- Javagetting Started 7426 2020-05-30 11:28:58
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- What file is .jar?
- In the software field, a JAR file is a software package file format, built in ZIP format, with ".jar" as the file extension. It is usually used to aggregate a large number of Java class files, related metadata and resource files into one file. In order to develop Java platform application software or libraries.
- Javagetting Started 5192 2020-05-29 16:44:22
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- What to do if the java plug-in cannot be loaded
- The solution to the problem that the java plug-in cannot be loaded: first open the control panel, click "Windows Firewall->Allowed Programs"; then open java, switch to the "Security" tab, and lower the security level to the lowest; then click "Change User Account" Control Settings"; finally pull down the mobile icon to "Don't notify".
- Javagetting Started 3973 2020-05-29 11:55:28
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- The difference between java constants and variables
- The difference between Java constants and variables: 1. Constants are modified with final, but different variable types have different allocated memory types; 2. Constants must be assigned an initial value when they are declared, while variables have no default values for initialized members; 3. Two When performing arithmetic operations on variables with different data types, data type conversion needs to be performed first.
- Javagetting Started 3839 2020-05-29 11:51:24
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- Encapsulation, inheritance, understanding of polymorphism
- Understanding of encapsulation, inheritance, and polymorphism: 1. Encapsulation is to hide the properties and implementation details of an object and provide public access to the outside world to prevent random access and modification of data; 2. Inheritance is to extend an existing class and Inherit the attributes and behaviors of the class to create a new class; 3. Multiple different implementations of the interface are polymorphism.
- Javagetting Started 36554 2020-05-28 17:47:41
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- Java counts the number of occurrences of each character in a string
- The method for Java to calculate the number of occurrences of each character in a string is: 1. Use Scanner to obtain the string entered by the user; 2. Create a Map collection; 3. Traverse the string and obtain each character; 4. In the Map collection Determine whether the key exists; 5. Traverse the Map collection.
- Javagetting Started 2997 2020-05-28 17:29:42
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- What are the java modifiers?
- This article comes from the Java development introductory column. It introduces the relevant knowledge of Java modifiers to everyone. It has certain reference value and I hope it can help everyone. Java modifiers are divided into: 1. Access control modifiers; 2. Non-access modifiers.
- Javagetting Started 3103 2020-05-27 17:39:51
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- Is java installed on the c drive?
- Java is installed on the c drive by default, and can also be installed on other disks. Just make sure to configure the Java environment variables during installation. The method to set the Java environment variables is: first click "My Computer-Properties-Advanced-Environment" Variable"; then create a new "classpath:" content; finally enter the java installation path.
- Javagetting Started 9053 2020-05-27 14:28:10
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- The difference between jdk and jre
- The difference between jdk and jre: 1. jdk is a Java development toolkit, while jre is the running environment of Java; 2. jdk provides tools such as the compiler javac, while jre does not include development tools; 3. jdk is the core of the entire Java. And jre is a collection of environments necessary to run Java programs.
- Javagetting Started 33567 2020-05-25 14:59:43
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- What software should Java beginners use?
- The software used by java beginners includes myeclipse, eclipse or notepad; for java beginners, it is not recommended to use IDE development tools, such as Eclipse, MyEclipse, IntelliJ IDEA, netbean, etc.
- Javagetting Started 5345 2020-05-24 11:22:41
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- Examples to explain variable types in java
- This article comes from the Java development introductory column. It explains the relevant knowledge of variable types in Java. It has certain reference value and I hope it can help everyone. There are three types of variables supported by java: 1. Class variables; 2. Instance variables; 3. Local variables.
- Javagetting Started 2258 2020-05-25 17:04:24
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- Introduction to java type conversion and its rules
- Data type conversion in Java must meet the following rules: 1. Type conversion cannot be performed on boolean types; 2. Object types cannot be converted into objects of unrelated classes; 3. When converting a large-capacity type into a small-capacity type, it must be Use casts.
- Javagetting Started 4499 2020-05-21 17:55:40
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- What is the difference between Java html
- The difference between Java and HTML is: 1. Java is an object-oriented programming language, while html is a hypertext markup language; 2. Java does server-side logic processing, while HTML is the display language for the front section of a web page; 3. JAVA can be understood as It is mainly responsible for dynamic programming, while HTML can create a static page.
- Javagetting Started 3267 2020-05-21 11:16:53
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- Introduction to source file declaration rules in java
- This article comes from the Java development introductory column. It introduces the source file declaration rules in Java. It has certain reference value and I hope it can help everyone. Source file declaration rules: There can be only one public class in a source file, and there can be multiple non-public classes in a source file.
- Javagetting Started 2914 2020-05-20 17:15:47
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