Instead of the typed parameter in generics (T) you can also use “?”, representing an unknown type. You can use a wild card as a −Type of parameter.Field.Local field.The only restriction on wilds cards is that you cannot it as a type argument of a generic method while invoking it.Java ... Read More

Generics is a concept in Java where you can enable a class, interface and, method, accept all (reference) types as parameters. In other words it is the concept which enables the users to choose the reference type that a method, constructor of a class accepts, dynamically. By defining a class ... Read More

Generics is a concept in Java where you can enable a class, interface and, method, accept all (reference) types as parameters. In other words it is the concept which enables the users to choose the reference type that a method, constructor of a class accepts, dynamically. By defining a class ... Read More

Generics is a concept in Java where you can enable a class, interface and, method, accept all (reference) types as parameters. In other words it is the concept which enables the users to choose the reference type that a method, constructor of a class accepts, dynamically. By defining a class ... Read More

How to read/A library named OpenCSV provides API’s to read and write data from/into a.CSV file. Here it is explained how to read the contents of a .csv file using a Java program.Maven dependency    com.opencsv    opencsv    4.4    org.apache.commons    commons-lang3    3.9 The CSVReader ... Read More

You can write data into a .csv file using the OpenCSV library and, you can communicate with MySQL database through a Java program using the mysql-java-connector.Maven dependencyThe following are the dependencies you need to include in your pom.xml file to write data to a .csv file from a database table. ... Read More

This writes data into a specific file or, a file descriptor (byte by byte). It is usually used to write the contents of a file with raw bytes, such as images.To write the contents of a file using this class −First of all, you need to instantiate this class by ... Read More

The BufferedWriter class of Java is used to write a stream of characters to the specified destination (character-output stream). It initially stores all the characters in a buffer and pushes the contents of the buffer to the destination, making the writing of characters, arrays and Strings efficient.You can specify the ... Read More

The BufferedReader class of Java is used to read the stream of characters from the specified source (character-input stream). The constructor of this class accepts an InputStream object as a parameter.This class provides a method named read() and readLine() which reads and returns the character and next line from the ... Read More

While defining a method, In general, we will specify the arguments it accepts along with the type as −myMethod(int a, String b){ }Suppose if you need to accept more than one variable of the same type you need to specify the variables one after the other as −myMethod(int a, int ... Read More