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- Java determines whether array is empty
- Java determines whether an array is empty based on the length of the array. If it is 0, it is empty, and vice versa. Java can also use isEmpty() to determine whether an array is empty. It determines whether there are elements in an array. If so, it returns a Boolean value of false, otherwise it returns true.
- JavaBase 8479 2019-11-13 11:05:18
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- what is java game
- Java games are programs written in Java language, which can effectively run on any electronic platform. Many mobile games are developed in Java. Before the popularity of smartphones, most non-smartphones supported running Java games.
- JavaBase 3934 2019-11-13 11:05:16
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- How to determine whether a file or folder exists in java
- The method to determine whether a file or folder exists in Java is: 1. Use the file.exists() method to determine whether a file exists; 2. If the file exists, use the file.isDirectory() method to determine whether it is a folder.
- JavaBase 6433 2019-11-13 11:07:51
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- what is java mobile
- Java mobile phones are mainly Linux-based mobile phones that use Linux+Java to run applications. Mobile phone software is developed in the Java language and is called a Java feature phone. The applications it runs are all executable files ending in *.jar.
- JavaBase 4501 2019-11-13 10:45:31
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- what is java exception
- Java exceptions are a consistent mechanism provided by Java to identify and respond to errors. This exception mechanism can separate the exception handling code and normal business code in the program, ensuring that the program code is more elegant and improving the robustness of the program.
- JavaBase 3336 2019-11-13 10:23:20
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- How to parse XML in java
- There are four ways to use javaXML: DOM way to parse XML, SAX way to parse XML, JDOM way to parse XML, and DOM4j way to parse XML.
- JavaBase 1965 2019-11-13 10:20:14
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- How to understand java reflection
- Reflection in Java is a mechanism that allows us to obtain internal information of classes such as methods, attributes, parent classes, interfaces, etc. at runtime. In other words, reflection is essentially a "reverse" process.
- JavaBase 2937 2019-11-13 10:19:37
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- What is a thread in java? How to understand?
- A thread in Java refers to an execution process in a process. A thread always belongs to a certain process. A thread does not have its own virtual address space and shares all resources allocated to the process with other threads in the process.
- JavaBase 3265 2019-11-13 10:12:59
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- what is java reference
- Java reference is one of the two major data types in Java. It points to an object and we can operate the object through the reference. References are stored in stack memory, objects are stored in heap memory, and references on the stack store the address of the object in the heap.
- JavaBase 3580 2019-11-13 10:12:56
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- How to understand the concept of threads in java
- A thread in Java refers to an execution process in a process. A thread always belongs to a certain process. A thread does not have its own virtual address space and shares all resources allocated to the process with other threads in the process.
- JavaBase 1949 2019-11-13 10:12:10
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- How to enter a string in java
- Steps to input strings in java: First, import the java.util.* package; then, you need to create a new scanner object (Scanner) that reads standard input (keyboard); now you can input strings from the keyboard, use Scanner.nextLine () method to get the string.
- JavaBase 42938 2019-11-13 10:10:15
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- Three ways to traverse arrays in java
- There are three ways to traverse an array in Java, namely: 1. Use a for loop to traverse the array; 2. Use the foreach statement to traverse the array; 3. Use the toString static method in the Arrays tool class to traverse the array.
- JavaBase 8478 2019-11-13 09:56:41
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- How to read data from file in java
- The method for java to read data from a file is: 1. Create a new Class class; 2. Write the Main method; 3. Create a new txt document in the root directory of the C drive for testing; 4. Create a File object; 5. Create a StringBuilder object; 6. , read the file content.
- JavaBase 8466 2019-11-13 09:41:47
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- How to define functions in java
- The syntax format of defining a function in Java is: modifier + return value type + function name ([parameter type 1 + parameter name 1], parameter type 2 + parameter name 2...) {execution statement + return + return value}.
- JavaBase 6172 2019-11-13 09:23:47
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- The difference between processes and threads in java
- The difference between processes and threads in Java is: 1. Threads in the same process share the address space of this process, while processes have independent address spaces; 2. Threads in the same process share the resources of this process, but between processes The resources are independent.
- JavaBase 3766 2019-11-12 17:26:41
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