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- What is the difference between stack memory and heap memory in Java?
- The difference between stack memory and heap memory in Java is: 1. Stack memory is used to store basic types of variables and reference variables, and heap memory is used to store objects in Java; 2. Variables stored in stack memory can only be stored in the thread to which they belong. Visible in , objects in heap memory are visible to all threads.
- JavaBase 4912 2020-05-17 15:21:51
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- What is the difference between jre and jdk in java
- The difference between jre and jdk in java is: jre is the java running environment, including the java virtual machine and the core class libraries required by java programs; jdk is a development tool kit, which is provided to java developers and includes java Development tools also include jre.
- JavaBase 3443 2020-05-17 15:05:14
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- What is the difference between get and post in java
- The difference between get and post in Java is: 1. Get obtains data from the server, and post transmits data to the server; 2. The amount of data transmitted by get is smaller, and the amount of data transmitted by post is larger; 3. Get is more secure. Low, post security is higher.
- JavaBase 4742 2020-05-17 14:47:19
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- What web servers are there in java
- The web servers in Java include: 1. Tomcat server, which is the first choice for beginners to learn to develop JSP applications; 2. Resin server, which is a very popular server that supports servlets and JSP; 3. JBoss server, which is a development source Code-based, pure java EJB server.
- JavaBase 2914 2020-05-17 14:38:06
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- What is a singleton in javaweb
- The singleton in javaweb means that all requests are processed with an object. For example, the objects in our commonly used service and dao layers are singletons. The reason why a singleton is used is because there is no need to create a new object for every request, because this wastes both CPU and memory.
- JavaBase 2477 2020-05-17 14:28:42
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- What is the difference between constructor methods and ordinary methods in java
- The difference between constructors and ordinary methods in Java is: 1. The method name of the constructor must be exactly the same as the class name in which it is defined, and there is no return type; 2. There must be a constructor in a class, because the system will automatically add no parameters Construction method.
- JavaBase 3526 2020-05-16 11:44:50
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- What is the implementation mechanism of java polymorphism?
- The implementation mechanism of Java polymorphism is: the reference variable defined by the parent class interface or interface can point to the instance object of the subclass or implementation class, and the method called by the program is dynamically bound at runtime, which is the specific implementation object pointed by the reference variable. Methods.
- JavaBase 4331 2020-05-16 11:04:04
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- What are the main data structures in java
- The data structures in Java are: 1. Stack, which implements a last-in-first-out data structure; 2. Dictionary, which is an abstract class that defines a data structure that maps keys to values; 3. Enumeration, which The retrieval interface defines a way to retrieve consecutive elements from a data structure.
- JavaBase 2775 2020-05-16 10:38:21
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- What is the difference between T and ? in java generics?
- The difference between T and ? in Java generics is: T represents an unknown type, which is used as a parameter in a method or a class generic; ? represents a general reference in generics, which is a placeholder character, data cannot be added to the container.
- JavaBase 6508 2020-05-16 09:58:42
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- How to define string in java
- The method of defining a string in Java is: 1. Define it through direct assignment, the specific code is [String str = "Hello";]; 2. Define it through instantiation through the construction method, the specific code is [String str = new String( "Hello");].
- JavaBase 6574 2020-05-15 11:35:41
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- What is the difference between queue and stack in java
- The difference between a queue and a stack in Java is: 1. The queue is first in, first out, and the stack is first in, last out; 2. The queue is implemented by the Queue interface, and the stack is implemented by the List interface; 3. The stack can only be inserted and deleted at one end of the table Operation, the queue performs insert operations on one end of the table and delete operations on the other end.
- JavaBase 4558 2020-05-15 11:21:44
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- Can interface implement interface in java?
- Interfaces cannot implement interfaces in java. An interface can inherit one or more interfaces. To inherit an interface, you need to use the extends keyword. A sub-interface inherits the methods of the parent interface, such as [public interface Hockey extends Sports, Event].
- JavaBase 4628 2020-05-15 11:04:17
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- What are the several states of java threads?
- The several states of java threads are: 1. NEW; 2. RUNNABLE; 3. BLOCKED; 4. WAITING; 5. TIMED_WAITING; 6. TERMINATED.
- JavaBase 2885 2020-05-14 15:53:01
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- How to declare an array in java
- The method of declaring an array in Java is: taking a one-dimensional array as an example, the method of declaring an array is [array type [] array name], such as [int[] array = {1,2,3}] or [int[] array = new int[] {1,2,3}], which means declaring an array named int type.
- JavaBase 5599 2020-05-14 15:14:56
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- What is a static variable in java
- Static variables in Java refer to variables modified by the static keyword, also called class variables. Static variables can be accessed directly through the class name, their life cycle depends on the life cycle of the class, and they can be shared by all instances of the class.
- JavaBase 4787 2020-05-14 14:01:52
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