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- How to determine whether an object is null in java
- How to determine whether an object is null in Java: To determine whether an object is null, you can use if(obj==null){} to determine. Reasons for empty objects in Java: 1. The programmer forgot to instantiate it. 2. The empty object is passed from other places.
- JavaBase 4056 2019-12-23 15:26:33
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- Java implements obtaining the character encoding of a text file
- This article is recommended by the Java introductory learning column. It introduces how to obtain the character encoding of a text file through examples. I hope it can help you. The default encoding of String in Java is UTF-8, which can be obtained using the [Charset.defaultCharset()] statement.
- JavaBase 12197 2019-12-23 11:49:49
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- Java method to determine whether it is empty
- How to determine whether it is empty in java: 1. Use the StringUtils.isEmpty(Object str) method to determine whether the string or object is empty. 2. Use the isEmpty() method to determine whether the array or collection is empty.
- JavaBase 2673 2019-12-21 17:07:43
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- Java compressed file garbled problem
- Solution to the problem of garbled java compressed files: 1. The Chinese garbled content can be solved by using the open source class library in the ant.jar class to compress the file. 2. Garbled comments in compressed files can be solved by using the setEncoding method to specify the encoding of the compressed file.
- JavaBase 2297 2019-12-21 16:38:56
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- Java email garbled solution
- Solution to garbled java email: 1. Use the encodeText() method to set the email subject encoding format to solve the garbled email title. 2. Set the encoding format of the email body in setContent().
- JavaBase 2325 2019-12-21 16:20:56
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- Several solutions to garbled code problems in Java
- Several solutions to garbled code problems in Java: 1. Use req.setCharacterEncoding("UTF-8") to solve the garbled code in the post method. 2. Use resp.setContentType("text/html;charset=utf-8") to solve the garbled response.
- JavaBase 2728 2019-12-21 15:53:48
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- Solution to Java download garbled code
- Solutions to garbled java downloads: 1. The IE kernel browser uses the specified encoding mechanism to convert the string format through the URLEncoder.encode() method. 2. Non-IE browsers: Use the new String(byte[],decode) method to parse the file using the specified encoding.
- JavaBase 2642 2019-12-21 15:07:54
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- Java method to determine whether strings are not equal
- How to determine whether strings are equal in Java: 1. Use "==" to determine whether they are equal and return true, and if they are not equal, return false. 2. Use the equals() method to determine whether the strings are equal. If they are equal, it returns true; if they are not equal, it returns false.
- JavaBase 6835 2019-12-21 14:50:40
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- Detailed explanation of java internal classes (with relevant interview questions)
- In the Java language, a class can be defined in another class or in a method. Such a class is called an inner class. Inner classes in a broad sense generally include these four types: member inner classes, local inner classes, anonymous inner classes and static inner classes.
- JavaBase 2167 2019-12-20 17:29:07
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- Detailed explanation on how to use the final keyword in java
- This article introduces the detailed use of the final keyword from the java development introductory column, hoping to help students who are learning. Usage: 1. Modify the class; 2. Modify the member method; 3. Modify the basic variable type; 4. Modify the reference variable; 5. Modify the constant.
- JavaBase 1925 2019-12-20 11:59:42
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- Solution to Chinese garbled characters displayed in Java
- Solution to garbled code displayed in java: 1. JSP Chinese garbled code: Specify the page encoding format as utf-8 at the beginning of each page of the JSP page. 2. Tomcat Chinese garbled code: Specify the encoding format in web.xml.
- JavaBase 4849 2019-12-18 16:39:53
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- How to find java api documentation
- The method to find the official API document of Java is: 1. First open Baidu, search for Oracle, and open the Oracle official website; 2. Then click [Download for developers] at the bottom of the website; 3. Then find [API] on the right side of the interface , click to enter, click on the version you need to open the document online.
- JavaBase 5125 2019-12-18 16:03:26
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- How to implement layout in java
- The method to implement layout in java is: 1. First inherit the [JFrame] class and define the components required for the layout; 2. Then create and add components in the constructor; 3. Then make relevant settings for the form, such as the title , size, position, etc.; 4. Finally set the display form.
- JavaBase 3782 2019-12-18 15:44:11
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- How to enable java applets in browsers
- How to enable the Java applet in the browser: 1. First find the Java program in the start menu; 2. Then under the security option in the Java control panel, turn on the [Enable Java content in the browser] option; 3. Then enter IE On the browser security settings page, click the [Custom Level] option and enable the Java applet script.
- JavaBase 5332 2019-12-18 15:14:11
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- How to add pictures in java form program
- The method of adding pictures in a java form program is: 1. First, create a new folder for saving pictures in the project directory; 2. Then write a program to set the basic information of the form; 3. Then read the files in the folder. Picture, create a [label] object, place the picture on the [label], and set the position; 4. Finally, run the program.
- JavaBase 16568 2019-12-18 14:34:37
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