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- What is the length of java int?
- java int is 4 bytes, 32 bits, and the value range is -2^31—2^31-1, that is, the length is -2147483648—2147483647.
- JavaBase 5824 2019-11-18 13:24:56
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- The difference between list and arraylist in java
- The difference between List and ArrayList in Java is: List is an interface, and ArrayList is an implementation class of the List interface. The ArrayList class inherits and implements the List interface.
- JavaBase 2234 2019-11-18 13:17:23
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- where is java jdk
- Java jdk is installed in the C:\Program Files\Java\ directory by default. You can open cmd and enter "java -version" to view the specific path; on Linux systems, you can use the which java command to view it.
- JavaBase 7465 2019-11-18 13:08:33
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- Is the key sorting of java map?
- The keys of HashMap and HashTable in java map are not sorted, and the data is fetched randomly; the keys of LinkedHashMap and TreeMap are sorted, and the output is in the order of storage and ascending order during traversal.
- JavaBase 2070 2019-11-18 11:46:46
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- What does the import keyword mean in java
- The import keyword in java is used to import packages. If a class is used in a class from another package, it needs to be introduced using the import keyword, for example: "java.util.*", which means to import all classes or interfaces under the util package.
- JavaBase 9836 2019-11-18 11:38:02
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- The difference between java map and list
- The differences between java map and list are: 1. Map is a collection that maps key objects and value objects, and elements cannot be repeated; 2. List stores objects in a linear manner, and elements can be repeated; 3. List uses the add method to add elements ;4. Map uses the put method to add elements, and so on.
- JavaBase 5262 2019-11-18 11:24:14
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- How to get out of for loop in java
- The method for Java to jump out of a for loop is: if it is a single-layer loop, use break to jump out normally; if it is a multi-layer loop, you can give the for loop a name. The naming rule is name + half-width colon, and then use break followed by the name. You can jump out of the for loop.
- JavaBase 4061 2019-11-18 11:14:58
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- java socket garbled code
- The solution to Java socket garbled code: first use InputStreamReader on the server to specify the client's input stream as utf-8 encoding, and use OutputStreamWriter to specify the output stream as utf-8 encoding; then set the same utf-8 encoding on the client.
- JavaBase 10922 2019-11-18 11:05:34
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- What does '...' mean in java
- The symbol "..." in Java represents a variable-length parameter, which means that any number of parameters of this type can be passed in at this position. For example, if used in a formal parameter, it means that the number of parameters passed in is variable. The parameters passed in are put into an array.
- JavaBase 15248 2019-11-18 11:00:08
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- How to write java sql statement
- How to write a java sql statement: first write the sql statement prototype; then change the required value to double single quotes; then add double quotes between the single quotes; then add two + signs between the double quotes; finally Just write the variable in the plus sign.
- JavaBase 8485 2019-11-18 10:51:07
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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 3218 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 4193 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 2887 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 4410 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 10551 2019-11-16 17:12:33
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