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- What is compilation error?
- "Compilation error" is an error caused by the mismatch between jdk and jre versions. The solution is: first find "server" in the console; then find "Classpath"; then open "Java Build Path"; finally find the jre that matches jdk That’s it.
- Javagetting Started 15104 2020-05-07 09:14:19
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- How to copy array in java
- This article comes from the java introductory program column. It introduces the method of JAVA array copying. It has certain reference value and I hope it can help everyone. You can copy an array of specified length through the copyOfRange() method.
- Javagetting Started 2828 2020-05-06 16:17:05
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- What is the difference between overloading and rewriting in java
- The difference between overloading and rewriting in Java is: Overloading means that multiple methods with the same name are defined in the class, but the number of parameters is different; overloading means that the subclass has a method with the same name as the parent class method, and the number of parameters is different. The same goes for numbers and types.
- Javagetting Started 2723 2020-04-30 17:11:36
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- What is the difference between for statement and while statement in java
- The difference between the for statement and the while statement in Java is that after the for loop ends, the variable in the loop is released from the memory in time, and the variable can no longer be accessed externally; and after the while loop ends, the variable can be accessed externally. This variable will be released when the GC is idle.
- Javagetting Started 4784 2020-04-30 14:06:38
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- How to use the Serializable interface to implement serialization in java
- This article comes from the java introductory program column. The article introduces the method of using the Serializable interface to implement serialization in java. It has certain reference value and I hope it can help everyone. The Serializable interface is a marker interface that does not need to implement any methods.
- Javagetting Started 2382 2020-04-28 17:51:15
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- How to generate random numbers between 1 and 100 in java
- How to generate random numbers between 1 and 100 in java: You can use the random() method, such as [int i = (int)(Math.random()*100+1);]. The random() method is a default method and does not accept any parameters.
- Javagetting Started 22631 2020-04-28 11:04:25
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- What are the three major characteristics of multithreading?
- This article comes from the java introductory column. It introduces the relevant knowledge of the three major characteristics of multi-threading. It has certain reference value and I hope it can help everyone. The three major characteristics of multithreading are: 1. Atomicity; 2. Visibility; 3. Orderliness.
- Javagetting Started 3212 2020-04-27 16:32:05
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- What does encapsulation mean in java
- Encapsulation in Java refers to hiding certain information of a class inside the class and not allowing direct access by external programs. Instead, the hidden information is operated and accessed through the methods provided by the class. The advantage of encapsulation is that it can hide the instance details of the class and facilitate modification and implementation.
- Javagetting Started 16445 2020-05-08 16:44:59
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- What is the difference between hot loading and hot deployment in java
- This article comes from the java introductory program column. The article introduces the difference between hot loading and hot deployment in java. It has certain reference value and I hope it can help everyone. Hot deployment is to redeploy the project while the server is running, and hot loading is to reload the class at runtime.
- Javagetting Started 3073 2020-04-25 17:24:05
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- What is the development tool for java programs called?
- The development tool for Java programs is called "JDK". "JDK" is the abbreviation of "Java Development Kit". It is a development environment for building applications, applets and components published on the Java platform. .
- Javagetting Started 3451 2020-05-09 13:32:39
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- what is orm
- The full English name of ORM is "Object Relational Mapping", which is object-relational mapping. The purpose is to operate the database like an object. Because the database is not object-oriented, programming is required for mapping; common ORM frameworks include hibernate and so on.
- Javagetting Started 5691 2020-05-09 13:32:03
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- Detailed explanation of Java internal classes
- This article comes from the java introductory program column. It introduces the relevant knowledge of Java internal classes in detail. It has certain reference value and I hope it can help everyone. Java internal classes are divided into: 1. Ordinary internal classes; 2. Method internal classes; 3. Anonymous internal classes; 4. Static internal classes.
- Javagetting Started 2503 2020-04-23 16:25:40
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- Why is Java language platform independent?
- The Java language has nothing to do with the platform because the compiler provided by the Java language does not program for a specific operating system and CPU chip, but compiles the Java source program into an "intermediate code" called bytecode for the Java virtual machine. The Java virtual machine The machine is responsible for translating the bytecode into machine code for the platform where the virtual machine is located.
- Javagetting Started 4126 2020-05-08 14:42:02
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- How to find the center index of an array in java
- This article comes from the java introductory column. This article introduces the method of finding the center index of an array in java. It has certain reference value and I hope it can help everyone. The sum of all elements to the left of the array center index is equal to the sum of all elements to the right of the array center index.
- Javagetting Started 2445 2020-04-20 16:09:59
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- What do Java programmers need to learn?
- Java programmers need to learn: 1. Object-oriented knowledge (objects, classes, encapsulation, polymorphism, inheritance, abstract classes, etc.); 2. JAVA syntax; 3. JSP and HTML; 4. WebServer; 5. Familiar with a Frameworks, such as Struts and Spring, etc.
- Javagetting Started 2956 2020-04-17 18:22:03
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