Java Tutorial Lab 2

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2016 Winter
LAB #2
Prepared by: Berk Soysal

• Variables are nothing but reserved memory
locations to store values.
• This means that when you create a variable you
re...

• There are two data types available in Java:
Primitive Data Types,
Reference/ Object Data Types
2016 Winter

• There are eight primitive data types supported by
Java.
• Primitive data types are predefined by the language
and named ...

Byte:
• 8 bit signed.
• Minimum value is -128 (-2^7)
• Maximum value is 127 (inclusive)(2^7 -1)
• Default value is 0
• Byt...

Short:
• 16-bit signed
• Minimum value is -32,768 (-2^15)
• Maximum value is 32,767 (inclusive) (2^15 -1)
• Short data typ...

Int:
• 32-bit signed
• Minimum value is - 2,147,483,648.(-2^31)
• Maximum value is 2,147,483,647(inclusive).(2^31 -1)
Long...

Float:
• 32-bit floating point.
• Float is mainly used to save memory in large arrays
of floating point numbers.
• Default...

Boolean:
• Represents one bit of information.
• There are only two possible values: true and false.
• This data type is us...

• Reference variables are created using defined
constructors of the classes. They are used to access
objects.
• Class obje...

• Assigning a value of one type to a variable of another
type is known as Type Casting.
• Example :
long l = 100000; // Ad...

• There are two different types of type casting:
 Implicit (Widening) Casting,
 Explicit (Narrowing) Casting.
2016 Winter

• Implicit conversion is automatic in Java,
• Information is preserved.
• Example:
short s = 4;
int i = s;
intshort
2016 W...

• Explicit conversion is NOT automatic,
• There MIGHT be some losses.
• Example:
int i = 100;
// Explicit type casting req...

• Each primitive data type has a corresponding “wrapper” class.
• As the name “wrapper” suggests, such class packages a va...

• Always guard a type casting with the proper test to
ensure that the value is in the proper range.
Example:
int i = 10000...

• ParseInt method of Integer class converts a String s
into an integer;
Example:
String s1 = "9";
String s2 = "4";
//Obser...

• Java is an OOP language.
• An Object is an entity that has states and behaviors.
Look around right now and you'll find m...

• Example:
Let’s create an Animal Class and a Cat and a Dog Object !
 Create 2 classes. (Animal and Main)
 Animal must h...

• There are two built-in classes that we can use to
generate random numbers in Java.
 Math Class random() method,
 Java....

• Random() method returns a value greater than 0.0 and
less than 1.0. With a simple calculation we can generate
numbers fo...

• Method nextInt(int n) which returns an int value
between zero (inclusive) and n (exclusive).
• Basically, this approach ...

• You are given 4 classes to demonstrate a 3 digit key
generator and a test program that tries to find that
key in a numbe...

public class Quiz {
public static void main(String[] args) {
String s = null;
if (s.length() > 0)
System.out.println(s);
e...

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