We cannot add an int and a double because both the numbers have to be of the same data type i.e. The first number is of type int and the second number is of type double. Type Conversions are of two types - implicit and explicit. For example, we can convert a double value to an int value or a char value to an int value. Type Casting is the conversion of a value from one data type to another data type. We can easily do so in Java using type casting. Or a more practical case would be to convert a double (10.2) to an integer (10). Suppose we are writing a program and we have an integer variable having a value 10 (an integer) and at some point of time we want it to be a string i.e., “10”. Some examples of non-primitive data types are Array, Class and Interface.Īt present, there is no need to go into the details of non-primitive data types as we will learn about them later. Non-primitive data types are defined by the programmer. Int, float, double, short, long, char, boolean, byte Non-Primitive Data type There are eight predefined data types in Java, which are Primitive data types are predefined (already defined) data types in Java. Primitive and Non-Primitive Data typesĪll the data types are broadly classified into primitive and non-primitive. For example, "x"+"y" got printed as xy (without evaluation) but x+y got evaluated first as 1+5 i.e., 6 and then 6 got printed. Whatever is not inside " " got evaluated first and then their values got printed. Here, whatever is written within " " got printed as it is, without getting evaluated. Integers are numbers which don’t have decimal. The int data type is used to store integers. Most commonly used data types in Java are int (integer), char (character), float (number having decimal), double (number having decimal), String (collection of characters) and boolean (true or false). In the above declaration, ch is the name of a variable which is of type char i.e., it can store only character values. For example, a character variable is declared as shown below. We specify the type of a variable at the time of its declaration. Similarly, a variable which stores a character value is of type char. A variable which stores an integer value is of type int. Variables can be of different types depending on the type of data it can store. However, we can also declare variables which can store a character, a sentence or other types of values. In all the examples in the previous chapter, the variables were declared of type int and thus can store only integer values. For example, the space required to store an integer is different from that required to store a character. All these values require different amounts of space in the memory. We know that 2 is an integer, ‘ a’ is a character and “ Let’s learn Java” is a sentence.
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