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How to determine whether a string contains a certain character in java

How to determine whether a string contains a certain character in Java: 1. Use the contains method to determine whether the string contains a certain character. If the string contains a character, it returns true, otherwise it returns false. 2. Use the indexOf method to determine. This method returns the position of the specified character in the string.

Dec 14, 2019 pm 04:17 PM

java

Introduction to the method of determining whether the specified file exists in java

How to determine whether a file exists in java: first use the exists() method to determine whether the file or directory represented by the specified path name exists, and then use the isDirectory() method to determine whether the test object is a folder.

Dec 14, 2019 pm 04:08 PM

java

How to add an error page in java

How to add an error page in java: first enable the error prompt in web.xml and connect to the error prompt page error.jsp. Then customize the error message page content.

Dec 14, 2019 pm 03:37 PM

java

Solution to Java reading Chinese garbled characters

Solution to Java reading Chinese garbled characters: Use the InputStreamReader class to specify the encoding method of the data stream when reading Chinese in Java. The InputStreamReader class is a bridge that associates bytes to characters. It is responsible for processing the conversion of read bytes into characters during the I/O process.

Dec 14, 2019 pm 03:27 PM

java 乱码

Solution to Chinese garbled data written by java to mysql

The reason why mysql data is garbled is that the character sets of Java and the database are inconsistent. Usually, you only need to set the character set specified when creating the database table to be consistent with the character set specified by the URL when setting the database connection in Java to solve the problem.

Dec 14, 2019 pm 03:05 PM

java mysql 乱码

Solution to Chinese garbled code in java writing xml

Solution to garbled Chinese characters written in XML in Java: Change the header encoding of the XML file to utf-8, and change the StreamResult encoding method to utf-8. The StreamResult class acts as the holder of the conversion result, which can be XML, plain text, HTML, or some other formatted markup.

Dec 14, 2019 pm 02:55 PM

java 乱码

How to express not equal in java

Inequality in Java can be expressed by "!=" between numbers, and strings can be compared using the "!equals" method. The equals() method is used to compare a string with a specified object. If the given object is equal to the string, it returns true; if it is not equal, it returns false.

Dec 14, 2019 pm 02:39 PM

java

Reasons and solutions for java compilation errors that cannot find symbols

The reason why the java compilation error cannot find the symbol: the Java naming conflicts with the class name in the JDK, causing the compilation error. Solution: Change the name of the java file to solve the problem.

Dec 14, 2019 pm 02:27 PM

java

Solution to garbled file name in java export file

Solution to garbled file names in Java export files: Add a code to the getBytes() method of the export statement String((edTemplate.getTemplateName()+"Import Template").getBytes(),"ISO-8859-1") Can.

Dec 14, 2019 pm 02:06 PM

java 乱码

Java uses lambda expression to sort a certain attribute of List object collection

This article is introduced by the java introductory learning column: how to use lambda expressions to sort a certain attribute of a List object collection. I hope it can help you. There are usually two methods for sorting, namely: 1. Sorting according to a certain field in positive order; 2. Sorting according to a certain field in reverse order.

Dec 14, 2019 pm 12:00 PM

java lambda List 对象集合属性排序

How to determine whether a string is garbled in java

Java method to determine whether the code is garbled: You can use the "java.nio.charset.Charset.forName("GBK").newEncoder().canEncode("test")" statement to determine whether the code is garbled.

Dec 14, 2019 am 11:07 AM

java 乱码

Java method to determine whether it is of type int

In Java, you can use the instanceof keyword to test whether the data to be judged is an instance of the int type to determine whether it is an int type. If it is an int type the instanceof operator returns true.

Dec 14, 2019 am 10:20 AM

java

Java method to determine if a file does not exist and then create it

How to create a file in Java when it is judged that it does not exist: Use the file.exists() method to judge whether the file exists. If it does not exist, use the file.createNewFile() method to create a new empty file.

Dec 14, 2019 am 10:07 AM

java

Java method to verify whether it is a number

How to verify whether it is a number in java: 1. Use the isDigit() function to verify whether it is a number. 2. Use the regular expression "^[-\+]?[\d]*$" to determine whether it is a number. 3. Determine whether the character is a number by judging the ASCII code of the character.

Dec 14, 2019 am 09:59 AM

java