Java Variables & Datatypes | Part 1 | Learn Java for Android App Dev

Assalm-o-Alaikum everyone! Hope you all are doing well , Today in this video we are going to discuss Java varaibles and its Data types. Variable is a name associated with a piece of memory that stores data and whose associated value may be changed To declare a variable you need to write the Java variable type with giving it a name.

For example, let’s declare two variables. One is named personName and has type String, other is named personAge and is of type int. String personName;
int personAge; Now that we’ve declared a variable, we can give it a value. This is called initializing a variable. To initialize a variable, you just type the variable name followed by an equal sign, followed by the desired value: personName = “Denis”;
personAge = 30; Since you often want to initialize a variable right away, you can do so in the same statement as the declaration. For example, here we merge the previous declarations and initializations into more concise code: String personName = “Denis”;
int personAge = 30; In computer programs, data is stored in variables. When we say data, we mean numbers with all their varieties, characters, and strings. These categories classify data into types called Data Types. In Java, each variable can store a specific type of data, and hence should belong to a specific data type. DATATYPE is either a basic (one of the listed in the above table) or user-defined (will be discussed later when talking about Classes) data type.There are several ways to get input from the user in Java. One of the easiest methods to do so is by using the Scanner class with the System.in object Once a variable is stored then space is allocated in memory. It defines a variable using a combination of numbers, letters and the underscore character.