1. Java so far
Week 7

2. What we should know by now
Print statement
System.out.print();
Primitive data
Int, float, double, long, String, char, boolean,
Variable declaration
int x ; or int x=1;
Concatenation
“Hello” + “hellow” = “Hellohello”
Arithmetic and Boolean expressions
Artithmetic
(6+2), (6-2), 6/2, 6%2 , .....
Boolean (1==(3-2)), (3>=2), (3<=2), ((3%2)==1)
Assignment statements
Int x , y , z; x =1; y=2, y= x+1 ;
The use of arguments
Command line argument are by default parsed as string,
Int x = Integer.parseInt(args[0]); double x = Integer.parseDouble(args[0])
Keyboard interaction with the use of Scanner.
Scanner input = new Scanner(System.in);
String x = input.nextLine();
Int x = input.nextInt();
Double x = input.nextDouble();
If statements
If (true ) then {statments1} else {statments2}

3. The random class
Random is defined in the "java.util" library package, so any Java source file that uses Random must begin with a line of the form
import java.util.Random; or
import java.util.*;

4. Creating Random Number Generators
The easiest way to initialize a random number generator is to use
Random generator = new Random();
Int x = generator.nextInt(); // generate negative and positive integers
Int x = generator.nextInt(n); // generate an integer between 0 and n (0 inclusive and n exclusive).
Int x = generator.nextInt(95) + 5 ; // generate an integer between 5 and 100
double x = generator.nextDouble(); // generate an double number between 0 and 1.

5. Example
import java.util.Random; class MyRandom { public static void main(String [] args) Random generator = new Random(); int x = generator.nextInt(); // random integer System.out.println(x); int y = generator.nextInt(100); //random integer x ( 0<= x<100) System.out.println(y); int t = generator.nextInt(95)+5; // random number betweein 5 and 100 System.out.println(t); double z = generator.nextDouble(); // random doube between 0 and 1 System.out.println(z); }

6. Home Work
A set of simple exercises can be downloadable from you web site
Do please do all these exercises before the 19th of November.