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- The difference between >>> and >> in java
- The difference between ">>>>" and ">>" in Java is: ">>" means right shift. If the number is positive, the high bits are filled with 0. If it is a negative number, the high bits are filled with 1; ">>>>" means Unsigned right shift. If the number is positive, the high bits are filled with 0. If the number is negative, the high bits are also filled with 0 after the right shift.
- JavaBase 3335 2019-11-18 10:44:32
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- java string garbled characters
- Solution to garbled java string: 1. Use "new String(str.getBytes("ISO-8859-1"), "utf-8")" to convert the string to utf-8 encoding; 2. Use "URLDecoder. decode" to transcode the url.
- JavaBase 4321 2019-11-18 10:22:39
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- Is java this a pointer?
- java this is not a pointer. There is no concept of pointers in Java, but there is a concept of handles similar to C++ pointers, so there are only some differences in syntax between the two, but the nature is the same, both refer to an object of a certain class.
- JavaBase 3003 2019-11-18 10:03:31
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- When does java trigger gc
- The timing for java to trigger gc are: 1. For YGC, it is triggered when Eden space is insufficient; 2. For FGC, it is triggered when old space is insufficient, perm space is insufficient, and System.gc() is called.
- JavaBase 4520 2019-11-18 09:46:06
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- The difference between java long int
- The differences between java long int are: 1. In 16-bit systems, long is 4 bytes and int is 2 bytes; 2. In 64-bit systems, long is 8 bytes and int is 4 bytes; 3. Their occupancy lengths are different. , long is 64 bits, and int is 32 bits; 4. The range of long is larger than that of int.
- JavaBase 10731 2019-11-16 17:12:33
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- What format is java
- Java is a programming language launched by Sun Microsystems. The .java format file is the source code file of java. Java has the characteristics of cross-platform and dynamic web, and is widely used in personal PCs, data centers, scientific supercomputers and other fields.
- JavaBase 4326 2019-11-16 16:50:45
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- What is initialization in java
- Initialization in Java refers to the process of assigning an initial value to a variable. For example, "String php = "good";" means to assign the initial value good to the variable php. The purpose of initialization is to make the variable have a value and prevent exceptions when using it.
- JavaBase 4667 2019-11-16 16:29:38
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- What is an object reference in java
- A reference to a Java object refers to a "class" type variable pointing to a created object. For example, Hero h = new Hero(), h is a reference to the object new Hero().
- JavaBase 6477 2019-11-16 16:18:03
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- How to receive keyboard input data in java
- How to receive keyboard input data in java: First, you need to import the Scanner class, and then create a Scanner class object to receive keyboard input data. Finally, you can call the corresponding method of the object to extract data from it.
- JavaBase 6917 2019-11-16 16:06:13
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- There are several types of java entry functions
- There is only one java entry function, which must meet these conditions: 1. Modified with public static; 2. The method name is main; 3. The parameter is an array of String type. If these conditions are not met, it cannot be used as an entry function in Java.
- JavaBase 4728 2019-11-16 16:04:20
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- Where is the java control panel?
- The java control panel is in the windows control panel. If jre is installed, the windows control panel will have a java icon. Double-click this icon to bring up the java control panel.
- JavaBase 11217 2019-11-16 15:40:06
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- The difference between class methods and instance methods in java
- The difference between class methods and instance methods in Java: Class methods are assigned memory addresses when loading a class, so they can be called by any object after loading and can be called directly through the class name, while instance methods need to create an object before they are assigned memory address.
- JavaBase 4980 2019-11-16 15:12:09
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- What are the commonly used methods in java
- Commonly used methods in Java are: 1. trim(), the trim() method is used to remove the leading and trailing whitespace characters of a string; 2. split(), the split() method splits characters according to matching a given regular expression String; 3. substring(), substring() method returns the substring of the string.
- JavaBase 8197 2019-11-16 15:00:19
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- The difference between method reference and method call in java
- The difference between method reference and method call in Java is: Method reference returns the implementation of the interface, but method call returns the return value of the method.
- JavaBase 4921 2019-11-16 14:45:32
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- When running the java program, it prompts that the main class cannot be found or cannot be loaded.
- The reason why java prompts that the main class cannot be found or cannot be loaded: by default, the java instruction searches for the address of the class file through the directory specified in the CLASSPATH environment variable. Solution: Add ".;" to the CLASSPATH environment variable.
- JavaBase 3632 2019-11-16 14:31:42
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