If-else

If and else use to apply logical mathematical conditions. This will return true or false after statement execution.

Below are some conditions:

a < b : a is less than b.

a > b : a is greater than b

a == b : a is equal to b

a >= b : a is greater than equal to b

a <= b : a is less than equal to b

a != b : a does not equal to b

There are different if else statements in Java:

1. if statement
2. if-else statement
3. nested else-if statements

If Statement:

The if statement decides either to run or not the block of code.

Example:

myMethod() -> called two times with different value 1 and 10. But, the output print only once.

myMethod(1) -> This will execute the block of code and print “a is less than 5” as a is less than 5, where the value of a is 1.

myMethod(10) -> This will not execute the block of code as a is greater than 5, where the value of a is 10.

else Statement:

This will always be coming with if statement. The else statement block of code will execute once if condition returns false.

Example:

myMethod(1) -> This will execute the block of code and print “a is less than 5” as a is less than 5, where the value of a is 1.

myMethod(10) -> This will execute else statement block of code “a is greater than 5” as a is greater than 5, where the value of a is 10.

else If statement:

This will add more conditions to check if the first condition if false.

sum(5) -> This will execute else if statement block of code as “a is equals to 5” and print “a is equal to 5”

Short hand if and else or Ternary Operator:

This is also known as short hand if and else. It converts multiple lines of code in single.

Syntax: