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- How to determine whether it is a number in java
- Java's way to determine whether it is a number: first write a try catch statement to catch the exception; then force the character to be converted to a number in the try statement; finally, the program does not catch the exception, indicating that it is a number.
- JavaBase 4086 2019-11-12 14:08:42
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- Solution to garbled characters when reading Chinese files in Java under Linux
- Solution to garbled characters when Java reads Chinese files under Linux: 1. Run the command vi /etc/profile; 2. Add the configuration zh_CN.GBK; 3. Run the command source /etc/profile to reload the configuration; 4. Restart the java project.
- JavaBase 3187 2019-11-12 14:04:44
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- How to create and set a button in java
- How to set a button in java: first import the java.awt and javax.swing packages; then create a new BorderLayout layout and create a JButton button to place on the layout; finally use the button method to set the button.
- JavaBase 16253 2019-11-12 13:51:18
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- How to delete elements from an array in JAVA?
- Java arrays have a fixed length, so elements in the array cannot be deleted directly. You can delete elements of the original array by creating a new array and assigning the retained elements in the original array to the new array.
- JavaBase 7260 2019-11-12 13:30:49
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- Solution to Chinese garbled characters when java adds data to mysql
- The reason why Chinese garbled characters appear when java adds data to the mysql database is that the character set is inconsistent. Solution: It only needs that the character set specified when creating the database table is consistent with the character set specified by the URL when setting up the database connection in Java.
- JavaBase 2169 2019-11-12 13:20:13
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- How to read data in java
- How to read data in java: first use File to create a file object; then use FileInputStream and InputStreamReader to obtain the input stream; finally, read the data line by line through the readLine method of the BufferedReader class.
- JavaBase 4358 2019-11-12 13:18:49
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- Detailed explanation of this keyword in Java
- The this keyword in Java points to a reference to the current object. Usage of this keyword: 1. this. attribute name, refers to accessing member variables in the class; 2. this. method name, accessing the member methods of this class; 3. this(), accessing the constructor method of this class.
- JavaBase 2484 2019-11-12 13:08:35
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- How to upload files in java
- How to upload files in java: 1. Download the jar package of the common-fileupload upload component and introduce it; 2. Create a new UploadHandleServlet class that inherits from HttpServlet; 3. Use FileOutputStream to write data and save it.
- JavaBase 2976 2019-11-12 11:57:31
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- How to get unique random numbers in java
- Methods to obtain non-repeating random numbers in Java: 1. Define a digital array; 2. Obtain random numbers through random digital array subscripts; 3. Assign the value of the random subscript of the digital array to the actual array; 4. Add the subscript to index The value is exchanged with the last value of the array index.
- JavaBase 2476 2019-11-12 11:46:01
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- How to solve garbled characters in java
- Methods for solving garbled characters in Java: 1. When the file is encoded in utf-8, use the "javac -encoding utf-8" parameter for compilation; 2. If the web page is garbled, you need to specify the encoding method of the response header "Content-Type"; 3. Use getBytes Method to perform encoding conversion.
- JavaBase 2165 2019-11-12 11:36:47
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- Does Java array have length method?
- There is no length() method for arrays in Java, only the length attribute. Array array.length returns the length of the array.
- JavaBase 4987 2019-11-12 11:30:33
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- What is the difference between interface and class in java
- The difference between interfaces and classes in Java is: essentially, an interface is also an abstract class, but the interface only contains the definition of constants and methods, without the implementation of variables and methods.
- JavaBase 4810 2019-11-12 11:29:36
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- What collection types are there in java?
- There are three main types of collections in Java: set, list and map. The objects stored in the List are ordered and repeatable; the objects stored in the Set are unordered and cannot be repeated; the Map collection stores key-value pairs, and the keys cannot be repeated, but the values can be repeated.
- JavaBase 4491 2019-11-12 11:19:17
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- How to initialize arrays in Java
- Methods of initializing arrays in Java: 1. arrayName = new type[] {element1...}; 2. type[] arrayName={element1...}; 3. arrayName = new type[length].
- JavaBase 5581 2019-11-12 11:17:05
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- How to configure java environment variables
- How to configure java environment variables: 1. Right-click the computer-Properties-Advanced system settings; 2. Click Environment Variables and click New under the system variables column; 3. Create a new JAVA_HOME variable with the value as the jdk installation path; 4. Edit the Path variable , just add the jdk\bin and jre\bin paths.
- JavaBase 9835 2019-11-12 11:14:42
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