Learning Java

KeyWords & Expressions

Keywords:

Java has 50 reserved words, which are used as keywords for applications. List of Java Keywords.

Expressions:

Expressions are actually building blocks of all Java program. Expressions are built with values, variables and operators.
Expressions are also built with Methods which we will see later.

	package lectures;

	public class KeyWordsAndExpressions {

	public static void main(String[] args) {
		
		// a mile is equal to 1.609344 kilometers
		double kilometers = (100 * 1.60934);
		int highScore = 50; //highScore = 50 is an expression
		
		if (highScore == 50) {
			System.out.println("This is an expression"); 
			}
		}
	}

Explanation:

In the above code:
kilometers = (100 * 1.60934) is an expression
highScore = 50 is an expression
highScore == 50 is an expression
"This is an expression" is an expression