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- How to write java in linux
- How to write java in linux: 1. Download the appropriate linux version jdk; 2. Create the /usr/java directory and unzip the jdk; 3. Modify the /etc/profile configuration environment variable; 4. Use vim to write java code; 5. Use javac compiles and runs using the java command.
- JavaBase 4764 2019-11-14 10:54:27
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- Is then a java keyword?
- Then is not a keyword in Java, nor is it a reserved word in Java. then is a keyword in other programming languages, such as the scripting language shell and Microsoft's Visual Basic language.
- JavaBase 4250 2019-11-14 10:37:27
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- How to set path in java?
- How to set the path for java: First, right-click My Computer-Properties-Advanced-Environment Variables-System Variables; then select "New" in the system variable option; then add the java bin path to the path.
- JavaBase 4187 2019-11-14 10:31:51
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- What should I do if the system cannot find java?
- The solution to the problem that the system cannot find java: First find the jdk directory and copy the jdk top-level directory; then open the system properties and select the system environment variable settings; then add a system variable "JAVA_HOME" and paste the jdk directory.
- JavaBase 6099 2019-11-14 10:19:59
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- What are java collections
- There are two major categories of Java collections: List and Set, both of which implement the Collection interface. List includes ArrayList, Vector and LinkedList; Set includes HashSet and TreeSet.
- JavaBase 3642 2019-11-14 10:10:40
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- java mutable classes and immutable classes
- A Java mutable class means that after obtaining an instance of this class, the content of the instance can be changed, such as changing the internal member variables of this instance; an immutable class means that after obtaining an instance of this class, the contents of the instance cannot be changed. Once an immutable instance Once created, the values of its internal member variables cannot be changed.
- JavaBase 2232 2019-11-14 09:54:35
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- Solve the problem that the browser does not support java
- Solution to the problem that the browser does not support Java: 1. Click on the browser settings option; 2. Click on the Internet options; 3. Click on the security option; 4. Click on the custom level; 5. Find "java applet script" and click "Enable" That’s it.
- JavaBase 21998 2019-11-14 09:40:53
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- Java determines whether a variable is empty
- How to determine whether a variable is empty in java: first import the org.springframework.util package; then use "StringUtils.isEmpty(Object str);" to determine; finally, you can determine that the variable is empty based on the returned value being false.
- JavaBase 4570 2019-11-14 09:32:55
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- Java determines whether an array contains a certain value
- How to determine whether an array contains a certain value in Java: 1. Create a findStr function and pass in two parameters: the array and the value to be found; 2. Use a for loop within the function to traverse the array; 3. Use equals to determine whether the array element is There are elements that are the same as the value to be found; 4. If there are the same elements, the array contains this value.
- JavaBase 6415 2019-11-14 09:20:17
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- What are the basic interfaces of Java collection class framework?
- The basic interfaces of the Java collection class framework have two major interfaces: Collection and Map, one is a collection of elements and the other is a collection of key-value pairs; among them, the List and Set interfaces inherit the Collection interface; HashMap and HashTable implement the Map interface.
- JavaBase 4238 2019-11-14 09:08:21
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- what is java expression
- A Java expression is a combination of variables or constants and symbols, ending with a semicolon ";". The main categories of Java expressions include arithmetic expressions, assignment expressions, conditional expressions and logical expressions.
- JavaBase 4051 2019-11-13 17:37:00
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- Principle of automatic loading in PHP and tutorial on using __autoload
- The principle of automatic loading in PHP: When adding a new class, if the PHP system cannot find the class, it will automatically call the __autoload($class_name) method in this file, and the new class_name becomes the parameter of this method.
- JavaBase 2656 2019-11-13 17:39:48
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- Java prompts that the system cannot find the specified file
- Solution to the java prompt that the system cannot find the specified file: 1. Check whether the file path is correct; 2. When creating a file, first use mkdirs to create the parent directory, and then use createNewFile to create the file.
- JavaBase 3405 2019-11-13 17:22:47
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- Several common locks in Java
- Common locks in Java are: 1. Spin lock; 2. Heavyweight lock; 3. Bias lock; 4. Lightweight lock; 5. Fair and unfair lock; 6. Pessimistic lock; 7. Optimistic lock.
- JavaBase 3878 2019-11-13 17:16:44
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- How many bytes does char occupy in Java?
- In Java, char occupies 2 bytes. Java uses Unicode encoding, and 2 bytes represent one character. When numbers are stored in English, the first byte is 0, and when Chinese characters are stored, they occupy two bytes.
- JavaBase 7089 2019-11-13 17:08:08
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