1. 1 Lecture # 2

2. * Introducing Programming with an Example * Identifiers, Variables, and Constants * Primitive Data Types * Byte, short, int, long, float, double, char, boolean * Operators * +, -, *, /, %, +=, -=, *=, /=, %=, ++, -- * Expressions 2 Lecture # 2

3. Class myProgram { public static void main(Strings arg[]) { System.out.println(“My First Java Program”); } Simple Java Code 3 Lecture # 2

4. Class myProgram { } This is the Base Class of Code where Main Function is Located 4 Lecture # 2

5. This is the Main Function of Program the compiler would start the compilation from this Main Function public static void main(Strings arg[]) { } 5 Lecture # 2

6. System.out.println(“My First Java Program”); A simple Print Java Statement 6 Lecture # 2

8. int x; // Declare x to be an // integer variable; double radius; // Declare radius to // be a double variable; char a; // Declare a to be a // character variable;

9. x = 1; // Assign 1 to x; radius = 1.0; // Assign 1.0 to radius; a = 'A'; // Assign 'A' to a;

10. * int x = 1; * double d = 1.4; * float f = 1.4;

11. final datatype CONSTANTNAME = VALUE; final double PI = 3.14159; final int SIZE = 3;

12. +, -, *, /, and % 5/2 yields an integer 2. 5.0/2 yields a double value 2.5 5 % 2 yields 1 (the remainder of the division)

13. OperatorExampleEquivalent +=i+=8i = i+8 -=f-=8.0f = f-8.0 *=i*=8i = i*8 /=i/=8i = i/8 %=i%=8i = i%8

14. * x = 1; * y = 1 + x++; * y = 1 + ++x; * y = 1 + x--; * y = 1 + --x;

15. char letter = 'A'; char numChar = '4'; Special characters char tab = ‘\t’;

16. boolean lightsOn = true; boolean lightsOn = false;

17. Lecture # 2 17