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The difference between class methods and object methods in java

The differences between class methods and object methods in "java" are: 1. Object methods must be called with objects, and class methods must be called with classes; 2. Properties can be directly accessed in object methods, but properties cannot be directly accessed in class methods; 3. , class methods will not change depending on the object created, but object methods will change depending on the object created.

Dec 05, 2019 pm 02:29 PM

java the difference Object methods class method

How to set java environment variables

The method to set the "java" environment variable is: first enter the advanced system settings in the computer, open the environment variable settings, then create a new "JAVA_HOME" system variable, set its value to the installation path, then edit the "PATH" variable, and finally according to the actual situation , select whether to create a new "Classpath" variable.

Dec 05, 2019 pm 01:50 PM

java environment variables set up

How to publish java project

Projects in "java" can be released using the "jar" package. First package the project, open a command window in the directory where the project is located, execute the command "mvn package" to generate a "jar" package, and then ensure the "java" running environment If it is correct, just execute the project startup command to start the project.

Dec 05, 2019 am 11:37 AM

java release project

What is a thread in java

The thread in "java" refers to an execution process in the process. Multiple threads can run in one process. For example: "java.exe" can run many threads in the process. Threads always belong to a certain process. Multiple threads in a process Threads share the memory of the process.

Dec 04, 2019 pm 04:03 PM

java thread

What is a class and what is an object in java

A class in "java" is a collection of entities with certain common characteristics. It is an abstract data type and an abstraction of entities with the same characteristics; an object is a specific individual of the class, which actually exists. . A class is a collection of objects, and objects are instances of a class.

Dec 04, 2019 pm 03:24 PM

java object kind

How to override a method in java

When overriding a method in "java", you need to ensure that the overridden method and the overridden method must have the same method name, parameter list, and return type. At the same time, the overridden method cannot use stricter methods than the overridden method. access permission.

Dec 04, 2019 pm 03:04 PM

java method rewrite

The difference between character stream and byte stream in java

The difference between character stream and byte stream in "java" is: 1. The basic unit of byte stream operation is byte, and the basic unit of character stream operation is "Unicode" code unit; 2. Byte stream does not use buffering by default Area, character stream uses buffer.

Dec 03, 2019 pm 04:33 PM

java the difference

The difference between threads and processes in java

The difference between threads and processes in "java" is: first, processes and threads are different operating system resource management methods; second, processes have independent address spaces, while threads are just different execution paths in a process, and there is no separate address space.

Dec 03, 2019 pm 03:56 PM

java the difference thread process

The difference between empty string and null in java

The difference between the empty string and "null" in "java" is: the empty string is an object that has been instantiated and has memory space, but the value stored in the memory space is empty; while "null" means There is no instantiated object and it does not occupy memory space.

Dec 03, 2019 pm 03:46 PM

java null the difference

What is the format of defining methods in java

The format of a method defined in "java" is: "access modifier + return value type + method name (parameter list) {method body}", where the access modifier represents the scope of permissions that the method is allowed to access, and the return value type represents the return value of the method The type of value, the method name represents the name of the method, and the parameter list represents the list of parameters passed to the method.

Dec 03, 2019 pm 03:36 PM

java definition method

What is the difference between synchronous interaction and asynchronous interaction in java

The difference between synchronous interaction and asynchronous interaction in "java" is: synchronous interaction sends a request, and you need to wait for the return before sending the next request. There is a waiting process; asynchronous interaction sends a request, and you can send it at any time without waiting for the return. There is no waiting process for the next request.

Dec 03, 2019 pm 03:21 PM

java the difference

The difference between array (Array) and list (ArrayList) in java

The difference between array (Array) and list (ArrayList) in "java" is: the space size of the array is fixed, and you cannot apply for it again when the space is not enough; the space of the list grows dynamically, and if there is not enough space, the list will be re-created. array and then copies all elements into the new array.

Dec 02, 2019 pm 05:57 PM

array arraylist java list the difference array

What are the commonly used collection classes in java

Commonly used collection classes in "java" include: 1. "Set" collection, which stores references to objects and does not allow duplicate objects; 2. "List" collection, which can store objects in a linear manner and allows the storage of duplicate objects; 3. "Map" collection, "Map" does not require uniqueness for values, but requires uniqueness for keys.

Dec 02, 2019 pm 05:04 PM

java Commonly used Collection class

What is the difference between asynchronous interaction and synchronous interaction in java

The difference between asynchronous interaction and synchronous interaction in "java" is that synchronous interaction needs to wait for a return after sending a request before it can send the next request; asynchronous interaction does not need to wait for a return after sending a request and can send the next request again at any time.

Dec 02, 2019 pm 04:42 PM

java the difference