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What are the commonly used classes in java

Commonly used classes in Java are: 1. String class; 2. StringBuffer class; 3. Random class, used to return a pseudo-random number; 4. Date class, the Date class represents the date; 5. Timer class, the Timer class represents the timing class .

Nov 16, 2019 pm 01:49 PM

java

What are the data types in java

There are two main types of data types in Java, namely basic data types (integer, floating point, character, Boolean) and reference data types (classes, interfaces, arrays).

Nov 16, 2019 pm 01:34 PM

java type of data

How to import excel files in java

How to import excel files in java: first download the POI resource package, then copy the jar package to the lib of the project and configure the compilation path, and finally add a reference to the java file to read the excel file.

Nov 16, 2019 pm 01:13 PM

excel file java import

How to assign value to array in java

In Java, you can use the "=" symbol to assign a value to an array, for example: "arr[0]=1", where 0 represents the first element with index 0 in the array, and 1 represents the first element in the array The value of the element is 1.

Nov 16, 2019 am 11:56 AM

java array Assignment

How to configure the java environment

The method to configure the java environment is: first enter the environment variable setting in the computer's advanced system settings, then create a new JAVA_HOME variable in the system variables, then set the system variable Path, and finally create a new variable classpath.

Nov 16, 2019 am 11:42 AM

java environment Configuration

Garbled characters appear when submitting data via form in java using post method

The reason why the data submitted by the form in java in post mode is garbled is because the browser views the ISO8859-1 code table to submit the data by default. Solution: Just set the encoding of the request object. Whichever way the client data is submitted, the request will be set to the encoding.

Nov 16, 2019 am 10:46 AM

form java post Garbled characters submit data

How to understand the concept of collections in java

A collection in Java is a container used to store objects. The Java collection class is stored in the java.util package. It should be noted that Java collections can only store objects, and they are references to objects rather than objects themselves.

Nov 16, 2019 am 10:32 AM

java concept understand gather

Java determines whether it is in an array

How to determine whether the data is in the array in java: first use Arrays.asList to convert the array into List type data; then use the contains method of List type data to determine; finally, it can be determined that the data is in the array based on the return value being true.

Nov 16, 2019 am 09:43 AM

java array

what is type in java

A type in Java refers to a data type. A data type is the collective name for a set of values ??with the same properties and a set of operations defined on this set of values. The Java language provides 8 basic data types and reference data types.

Nov 16, 2019 am 09:25 AM

java type

Java determines whether a string contains characters

How to determine whether a string contains characters in Java: 1. Use the startsWidth function. If the return value is true, it means it is included. 2. Use the contains function. If the return value is true, it means it is included. 3. Use the indexOf function. If the return value is not -1, it means it is included.

Nov 15, 2019 pm 05:25 PM

java string

The difference between static methods and non-static methods in java

The difference between static methods and non-static methods in Java is: static methods are methods modified with static in the class and have been loaded and allocated when the class is defined, while non-static methods are methods without the static keyword. In the class No memory is occupied when defined.

Nov 15, 2019 pm 05:16 PM

java the difference static method non-static method

Java determines whether a character is in date format

The method to determine whether a character is in date format: first create a function isValidDate that receives a string parameter; then use SimpleDateFormat in the try statement to convert the string into date format; finally, an exception can be caught in catch indicating that the string is not in date format.

Nov 15, 2019 pm 05:14 PM

java date

How to use java package

How to use java packages: Packages are used to avoid class name conflicts. When defining a package, add "package package name;" in the first line of the code. When using a package, use "import package name.class name;" to import.

Nov 15, 2019 pm 04:52 PM

java Bag

How to understand the concept of process in java

The process in Java is the basis of the operating system structure. Each process has its own address space. At the same time, the process is also an executing program. Only when the processor gives life to the program can it become an active entity.

Nov 15, 2019 pm 04:44 PM

java concept understand process