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- 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.
- Javagetting Started 14042 2019-12-04 15:24:03
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- 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.
- Javagetting Started 7337 2019-12-04 15:04:58
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- 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.
- Javagetting Started 3001 2019-12-03 16:33:46
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- 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.
- Javagetting Started 2718 2019-12-03 15:56:19
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- 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.
- Javagetting Started 2655 2019-12-03 15:46:29
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- 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.
- Javagetting Started 9819 2019-12-03 15:36:11
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- 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.
- Javagetting Started 3316 2019-12-03 15:22:35
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- 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.
- Javagetting Started 15852 2019-12-02 17:57:31
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- 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.
- Javagetting Started 4291 2019-12-02 17:04:31
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- 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.
- Javagetting Started 3240 2019-12-02 16:43:45
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- What are the commonly used data types in java
- Commonly used data types in "java" include basic data types and reference data types. Basic data types are divided into: "byte", short integer, integer, long integer, floating point, double precision floating point, Character type, Boolean type; reference data types are divided into: class, interface, array.
- Javagetting Started 4796 2019-12-02 17:59:13
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- The difference between int and integer in java
- This article introduces the difference between int and integer from the java introductory column. I hope it can help you. Int is a basic data type, and Integer is a reference data type; the int type directly stores values, and Integer requires an object to be instantiated.
- Javagetting Started 2869 2019-11-30 17:24:42
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- Java functions - similarities and differences between constructors and member functions
- This article introduces the similarities and differences between constructors and member functions from the java zero-based introduction column. I hope it can help you. Constructors can only be called when an object is created, and member functions can only be called after the object is created. The constructor does not need to return a value, and the member function does not need to return a value.
- Javagetting Started 2511 2019-11-30 16:37:47
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- Introduction to basic data types and reference data types in Java
- This article introduces the relevant knowledge of basic data types and reference data types from the java programming introductory column. I hope it can help you. When a basic data type is created, a memory is allocated for it on the stack, and the value is stored directly on the stack.
- Javagetting Started 2298 2019-11-30 15:43:41
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- Detailed introduction to exception types and exception handling in java
- This article introduces the exception types and exception handling in Java in detail from the java introductory program column. I hope it can help you. All exceptions in Java are inherited from Throwable. Throwable has two subclasses, namely Error and Exception.
- Javagetting Started 2981 2019-11-30 15:00:27
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