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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