If else statements in java are used to test some conditions. It evaluates a condition to be
true or
false.
Table of Contents
There are three types of if statements.
- If statement
- If else statement
- If else if ladder statement
Simple If statement
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if(condition) { // If condition is true, this block will be executed } |
For example:
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public class IfMain { public static void main(String[] args) { int price=20; if(price > 10) System.out.println("Price is greater than 10"); } } |
Output:
Price is greater than 10
You can write single line followed by semi color after if or you can use curly braces to write block of code.
You can rewrite above code as below.
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public class IfMain { public static void main(String[] args) { int price=20; if(price > 10) { System.out.println("Price is greater than 10"); } } } |
If else statement
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if(condition) { // If condition is true, this block will be executed } else { // If condition is false, this block will be executed } |
For example:
Check if number is odd or even.
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package org.arpit.java2blog; public class IfElseMain { public static void main(String[] args) { IfElseMain ieMain=new IfElseMain(); ieMain.checkOddOrEven(20); } public void checkOddOrEven(int number) { if(number%2==0) { System.out.println(number+" is even"); } else { System.out.println(number+" is odd"); } } } |
Output:
20 is even
If else if ladder statement
Before we learn about If else if ladder statement, let’s first see some conditional operator.
Conditional Operators
Java provides many conditional operators.Some of them are:
- == Â : To check if two variables are equal
- != Â : To check if two variables are not equal
- <   : To check if first variable is less than other
- <= : To check if first variable is less than or equal to other
- >  :  To check if first variable is greater than other
- >= :  To check if first variable is greater than or equal to other
- && : Â And operation is used to check if both conditions,used with && operator, are true
- ||   :  or operation is used to check if one of the conditions,used with || operator, are true
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if(condition1) { // If condition1 is true, this block will be executed. } else if(condition2) { // If condition2 is true, this block will be executed. } else if(condition3) { // If condition3 is true, this block will be executed. } else { // If all above conditions are false, this block will be executed. } |
For example:
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package org.arpit.java2blog; public class IfElseIfLadderMain { public static void main(String[] args) { int age=28; if(age >= 18 && age <= 25) { System.out.println("Age is between 18 and 25"); } else if(age >= 26 && age <= 35) { System.out.println("Age is between 26 and 35"); } else if(age >= 36 && age <= 60){ System.out.println("Age is between 35 and 60"); } else{ System.out.println("Age is greater than 60"); } } } |
Output:
Age is between 26 and 35
That’s all about if else statement in java.
