Introduction to Java Programming: Conditional Statements

Introduction to Java and Object Oriented Programming

• Java provides conditional statements to control the flow of code.
• Conditional statements are fundamental features of Java, providing a smooth flow of program.

Types of Conditional Statements

• Decision Making statements:
  • if statement
  • switch statement
• Loop statements:
  • do while loop
  • while loop
  • for loop
  • for-each loop
• Jump statements:
  • break statement
  • continue statement

Decision Making Statements

• If Statement:
  • Evaluates a condition and executes a block of code if true.
  • Three ways to execute loops in Java.

Loop Statements

• For loop:
  • Used to run a block of code for a certain number of times.
  • Syntax: for (initialization; condition; increment/decrement) { code block }
  • Example: Simple for loop, Nested for loop
• While loop:
  • Used to run a specific code until a certain condition is met.
  • Syntax: while (condition) { code block }
  • Example: While loop
• Do-while loop:
  • Similar to while loop, but the body of the loop is executed once before the test expression is checked.
  • Syntax: do { code block } while (condition)

Jump Statements

• Break statement:
  • Used to terminate the execution of the nearest looping statement or switch statement.
  • Widely used with switch statement, for loop, while loop, do-while loop.
  • Example: Break statement
• Continue statement:
  • Used to skip the rest of the code inside the loop and move to the next iteration.

Switch Statement

• Contains multiple blocks of code called cases and a single case is executed based on the variable being switched.
• Similar to if-else-if statements.
• Syntax: switch(expression) { case x: code block break; case y: code block break; default: code block }
• Example: Switch statement

Tasks and Examples

• Task 1: Declare variables and initialize integer variables with values, add them, and check if sum is greater than 20.
• Task 2: Check if a number is divisible by 5 and 11.
• Task 3: Check if a number is even or odd.
• Task 4: Create a simple calculator using switch statement.
• Task 5: Find the maximum of two numbers using switch statement.
• Task 6: Print all even numbers between 1 to 100 using for loop.
• Task 7: Calculate the factorial of a number.