Computational Problem Solving 004 (1).pptx (1).pdf

Table of Contents
Java Introduction
Data Types
Sum of two complex numbers
Multiply and Divide
Conditional Control Structure
Coin Change
Odd or even
Uppercase or Lowercase
Profit or Loss
Sum of N numbers
Factorial of a number
Fibonacci series
Armstrong Number
Reverse a number
Linear Search
Matrix Multiplication
Reverse an array
Minimum Sum
Remove duplicates
Closest Pair
String validation
Anagrams
Twin Prime
Vowel count
Maximum Sum
Longest Palindrome
Missing number
Reverse vowels

Reverse only letters
Power of three
Convert number to Hex
Basic Calculator
Perfect Squares
Spiral Matrix
Permutations
Student Attendance Record
Name password generation
Reverse String
Count even digits
Number Series
Diamond Series

Introduction
❑ Java is a general-purpose, high-level programming language .
❑ Java is a programming language that James Gosling developed at
Sun Microsystems_Inc in the year 1995, which later on was taken
into possession by the Oracle Corporation in 2009.
❑ Java Virtual Machine interprets the bytecode and converts it to
platform specific machine code. Hence, Java is also called a
platform-independent programming language.
❑ Java is a class-based object-oriented programming language that
implements the principle of write once code anywhere.

Features of Java
1. Simple
2. Object-Oriented
3. Portable
4. Platform independent
5. Secured
6. Robust
7. Architecture neutral
8. Interpreted
9. High Performance
10. Multithreaded
11. Distributed
12. Dynamic

Applications of Java
o Mobile App Development
o Desktop GUI Applications
o Web-based Applications
o Gaming Applications
o Big Data Technologies
o Distributed Applications
o Cloud-based Applications
o IoT Applications
o Enterprise Applications
o Scientific Applications

Data Types
There are two types of data types in Java:
Primitive data types : The primitive data types include:
o boolean data type
o byte data type
o char data type
o short data type
o int data type
o long data type
o float data type
o double data type
Non-primitive data types : The non-primitive data types include :
o Classes
o Interfaces
o Arrays.

Computational Problem Solving 004 (1).pptx (1).pdf

Example
int myNum = 5; // Integer (whole number)
float myFloatNum = 5.99f; // Floating point number
char myLetter = 'D’; // Character
boolean myBool = true; // Boolean
double d2 = 1.234e2 // Double
String myText = "Hello"; // String
int arr[] = new int[100]; // Array

If-else Statement
The if Statement:
If(condition) {
//block of code to be executed if the condition is true
}
Example :
int x = 20;
int y = 18;
if (x > y)
{
System.out.println("x is greater than y");
}

The else Statement:
If(condition) {
//block of code to be executed if the condition is true
}
else {
// block of code to be executed if the condition is false
}
Example :
int x = 20;
if (x > 18){
System.out.println("x is greater than 18");
}
else {
System.out.println("x is less than 18");
}

The else if Statement:
If(condition 1) {
//block of code to be executed if the condition 1 is true
} else if (condition 2) {
// block of code to be executed if the condition 1 is false and condition 2 is true
} else {
// block of code to be executed if the condition 1 is false and condition 2 is false
}
Example : int x = 0;
if (x > 0){
System.out.println("x is greater than 0");
} else if (x < 0) {
System.out.println("x is less than 0");
} else {
System.out.println("x is 0");
}

Loops in Java
for Loop:
for(initializing statement;testing condition;increment/decrement)
{
//code to be iterated
}
Example :
for (i = 0; i <= 10; i++)
{
System.out.println("Value of i = " + i);
}

while Loop:
while(boolean condition)
{
//statements;
}
Example :
while (i < 5) {
System.out.println("The value of i is = " + i);
i++;
}

do while Loop:
do {
statement(s);
} while(test-expression) ;
Example :
char ch = 'A' ;
do
{
System.out.println( ch + " " );
ch++;
} while(ch <= 'Z');

Arrays in Java
• In Java, all arrays are dynamically allocated.
• Arrays are stored in contagious memory.
• Since arrays are objects in Java, we can find their length using the
object property length.
• A Java array variable can also be declared like other variables with
[] after the data type.
• Java array can also be used as a static field, a local variable, or a
method parameter.
• The size of an array must be specified by int or short value and not
long.

Instantiating array:
var-name = new type [size];
int intArray[]; //declaring array
intArray = new int[20]; // allocating memory to array
int[] intArray = new int[20]; // combining both statements in one
Array Literal:
int[] intArray = new int[]{ 1,2,3,4,5,6,7,8,9,10 };
// Declaring array literal

Computational Problem Solving 004 (1).pptx (1).pdf

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