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What are the methods to enter a character in java

The methods for inputting a character from the keyboard in "java" are: 1. Use the "read()" method to obtain, but this method can only obtain one character, and the type of the variable obtained must be of the "char" type; 2. , Use the "BufferedReader" class to obtain; 3. Use the "Scanner" class to obtain.

Nov 23, 2019 am 11:48 AM

java character method enter

How to calculate the day of the year for a specified date in java

How to calculate the day of the year for a specified date in Java: first calculate whether it is a leap year or an ordinary year through the year, February 28 days in ordinary years, February 29 days in leap years, the number of days in the remaining months is fixed, and then the number of days in the month before the specified month and The days in the specified months are added together, and the sum is the day of the year.

Nov 23, 2019 am 11:30 AM

java

Strings in java are always garbled

The reason why strings in "java" are always garbled is: "TOMCAT" uses "ISO8859-1" encoding by default. The solution is: first use "ISO8859-1" to convert the string obtained from "TOMCAT" into a byte array, and then use "GBK" to encode it.

Nov 23, 2019 am 11:25 AM

java Garbled characters string

How to determine whether a character is a number in java

The method to determine whether a character is a number in "java" is: you can use the static method "isDigit()" in the "Character" class. The "isDigit()" method is used to determine whether the parameter character passed in is a number. If If the parameter character is a number, "true" is returned, otherwise "false" is returned.

Nov 23, 2019 am 11:15 AM

java judgment character number

How to determine whether a string is in date format in java

How to determine whether a string is in date format in Java: You can first define a regular expression to match the correct date format, and then use the matches() method to detect whether the string matches the regular expression in the specified date format. If it is a date format, it returns true.

Nov 23, 2019 am 11:02 AM

java

Solution to garbled database data in java

Solution to Java database garbled code: 1. Use the "CHARACTER SET 'utf8'" statement to set the encoding format when creating the database. 2. Add the "CHARSET=utf8" statement to set the encoding format when creating the table. 3. Set the encoding format when setting the url.

Nov 23, 2019 am 10:45 AM

java

How to determine whether an array contains an element in java

How to determine whether an array contains an element in Java: 1. Convert the array to a list, and then use the contains method of the list to determine. If it contains, this method returns true, otherwise it returns false. 2. Traverse the array and determine whether there is an element in the array that is equal to the specified element to determine whether it contains the specified element.

Nov 23, 2019 am 10:33 AM

java

How to generate random unique numbers in java

How to generate random non-repeating numbers in Java: Determine a minimum value min and a maximum value max, use the random() method to generate a non-repeating random array based on min and max, put all the numbers from min to max into the array, and then one by one The number taken out is a non-repeating random number.

Nov 23, 2019 am 10:20 AM

java

What principles should be followed when designing interfaces in java

When designing an interface in Java, you must first clarify the responsibilities of the interface, that is, the interface type, and then try to make the interface as single as possible to ensure that an interface only does one thing. Finally, you should clarify the interface protocol according to the specific situation, and determine whether to use the "HTTPS" protocol or "FTP" protocol.

Nov 23, 2019 am 10:15 AM

java in principle interface design

Java web page garbled solution

Solution to garbled web pages in Java: 1. Change the character set of the page in the jsp page to UTF-8 to solve the garbled web pages. 2. In java web projects, you can set the encoding format to solve garbled characters when obtaining values ??in post and get methods.

Nov 23, 2019 am 10:00 AM

java

Java determines what day of the week a specified date is

How to determine the day of the week for a specified date in Java: 1. Use the Calendar class to get the day of the week for the specified date. The week obtained by this method starts on Sunday. 2. Use the SimpleDateFormat class to format the date to obtain the day of the week. The parameter "EEEE" represents the day of the week.

Nov 23, 2019 am 09:43 AM

java

Java determines whether an object is a string

Java method to determine whether an object is a string: You can use the instanceof operator to determine whether the specified object is a real class of the string class to determine whether the object is a string. If the instanceof operator returns true, the object is a string, and if it is false, The object is not a string.

Nov 23, 2019 am 09:35 AM

java

How to determine equality in java

The methods for judging whether it is desired in Java are: 1. To judge whether the basic data types in Java are equal, you can directly use "==" to judge. If they are equal, it returns true, and if they are not equal, it returns false. 2. To determine whether a custom object is equal, you can override the equals() method in the object's class definition.

Nov 23, 2019 am 09:17 AM

java

Determine whether a string is Chinese in java

Unicode encoding can be used in java to determine whether a string is Chinese. The Unicode encoding range of Chinese is "0x4e00-0x9fa5" or decimal "19968-40869". In Java, you can determine whether the character is Chinese by looping through the string and comparing it with Unicode encoding.

Nov 22, 2019 pm 05:12 PM

java