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- How to understand the concept of rewriting in java
- Overriding in Java refers to the situation where there are two methods with the same name and parameter list in the Java subclass and the parent class. Among them, the parameter list of the overridden method must be exactly the same as the parameter list of the overridden method.
- JavaBase 7510 2019-11-12 09:39:09
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- What is java abstract class
- A Java abstract class is a class modified with the abstract keyword. This class is called an abstract class. An abstract class is a collection of public attributes of all its subclasses and a class that contains one or more abstract methods.
- JavaBase 3913 2019-11-11 11:48:30
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- what are java generics
- Java generics means that the type is parameterized from the original specific type, similar to the variable parameters in the method. At this time, the type is also defined in parameter form, and then the specific type is passed in when using/calling.
- JavaBase 3621 2019-11-11 11:40:20
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- Can java interfaces be inherited?
- Java interfaces can be inherited, and it is multiple inheritance, but only interfaces can inherit interfaces, and classes can only implement interfaces. An interface can inherit another interface or multiple interfaces, and a common class can implement multiple interfaces.
- JavaBase 7276 2019-11-11 11:23:02
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- how to run java
- How to run java: First download and install [JDK 6.0]; then create a new variable in the computer system variables, the variable name is [JAVA_HOME] and enter [cmd] in the run window; then create a new variable in the root directory of the C drive subdirectories and java files; finally run java in the command line window.
- JavaBase 13144 2019-11-11 11:22:38
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- The difference between java interface and abstract class
- The difference between a Java interface and an abstract class: All methods in an interface are implicitly abstract; while an abstract class can contain both abstract and non-abstract methods. A class can implement many interfaces, but can only inherit one abstract class. An abstract class can implement an interface without providing implementations of the interface methods.
- JavaBase 3465 2019-11-11 11:18:02
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- what are java environment variables
- Java environment variable refers to a parameter in the operating system's running environment. After configuring the java environment variables, you can use java and javac commands anywhere in the system. When executing commands, you no longer need to enter the bin directory under the java installation directory.
- JavaBase 6944 2020-09-05 17:06:23
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- The difference between java classes and interfaces
- The difference between Java classes and interfaces: All properties of interfaces are public static final; all classes are public by default; subclasses can only inherit one parent class (extends) and can inherit multiple interfaces (implement).
- JavaBase 3721 2019-11-11 11:08:59
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- what is java inheritance
- Java inheritance is a technology that uses the definition of an existing class as a basis to create a new class. The definition of a new class can add new data or new functions, or use the functions of the parent class, but it cannot selectively inherit the parent class. This technology makes it very easy to reuse previous code, which can greatly shorten the development cycle and reduce development costs.
- JavaBase 10132 2019-11-11 10:48:56
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- How to connect to database in java
- Java uses JDBC to connect to the database. It is a Java API used to execute SQL statements and can provide unified access to a variety of relational databases. It consists of a set of classes and interfaces written in the Java language.
- JavaBase 6007 2019-11-11 10:45:45
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- What is reflection mechanism in java
- The Java reflection mechanism is in the running state. For any class, all properties and methods of this class can be obtained, and for any object, any of its properties and methods can be called.
- JavaBase 5582 2019-11-11 10:37:26
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- what is java interface
- An interface is an abstract type in the JAVA programming language, which is a collection of abstract methods. An interface is usually declared with interface. A class inherits the abstract methods of the interface by inheriting the interface.
- JavaBase 15589 2019-11-11 10:26:09
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- How to decompile java class files
- The method to decompile Java class files is: 1. Download jdgui suitable for your own environment; 2. View the class file; 3. Run the decompressed jdgui program; 4. Select the class file that needs to be decompiled; 5. Decompile.
- JavaBase 5061 2019-11-11 10:19:30
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- What is reflection in java?
- Java reflection means that in the running state of a Java program, for any class, all properties and methods of this class can be obtained; for a given object, any of its properties and methods can be called. This method of dynamically obtaining the contents of a class and dynamically calling objects is called reflection mechanism.
- JavaBase 5669 2019-11-11 10:04:08
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- what is encapsulated java
- Java encapsulation is an object-oriented design method. It is a method of packaging and hiding the implementation details of abstract functional interfaces; encapsulation has the advantages of reducing coupling and accurately controlling member variables.
- JavaBase 4023 2019-11-11 09:47:28
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