Java if else statement
Java Tutorial » Java if else
In Java programming as many others programs, we use if statement to control the flow of the program created
Java programming has the following conditional statements:
1. if statement - block of code to be executed, if a specified condition is true,
2. if-else statement - a block of code to be executed, if the same condition is false,
3. if-else-if ladder - to specify a new condition to test, if the first condition is false,
4. nested if statement - to use if..else statements inside an if...else statement
if Statement, example
It will executes the "if' statement block if condition is true.
Syntax
Example
The number is greater.
if(condition){
//code to be executed if the condition is true
}
//code to be executed if the condition is true
}
Example
public class Main {
public static void main(String[] args) {
int my_number1 = 12;
int my_number2 = 7;
// checks if my_number1 is greater than my_number2
if (my_number1 > my_number2) {
System.out.println("The number is greater.");
}
}
}
Output:public static void main(String[] args) {
int my_number1 = 12;
int my_number2 = 7;
// checks if my_number1 is greater than my_number2
if (my_number1 > my_number2) {
System.out.println("The number is greater.");
}
}
}
The number is greater.
Java if-else Statement
The program will executes the if block, if condition is true otherwise else block will be executed
Syntax:
Example:
Have a good night.
if(condition){
//code executed if condition is true
}else{
//code executed if condition above if is false
}
//code executed if condition is true
}else{
//code executed if condition above if is false
}
Example:
public class Main {
public static void main(String[] args) {
int time = 21;
if (time > 22) {
System.out.println("Have a good evening.");
} else {
System.out.println("Have a good night.");
}
}
}
Output:public static void main(String[] args) {
int time = 21;
if (time > 22) {
System.out.println("Have a good evening.");
} else {
System.out.println("Have a good night.");
}
}
}
Have a good night.
Java if...else...if Statement
We can have "if...else...if" sequence, what can be used to execute a block of code among multiple other blocks
Syntax:
Example:
The number is 5.
if(con1){
//execut code if cond1 is true
}else if(con2){
//execut code if con2 is true
}
else if(con3){
//execut code if con3 is true
}
...
else{
//execut code if all the conditions are false
}
//execut code if cond1 is true
}else if(con2){
//execut code if con2 is true
}
else if(con3){
//execut code if con3 is true
}
...
else{
//execut code if all the conditions are false
}
Example:
public class Main {
public static void main(String[] args) {
int my_number = 5;
// checks if number is greater than 5
if (my_number > 5) {
System.out.println("The number is greater than 5.");
}
// checks if number is less than 5
else if (my_number < 5) {
System.out.println("The number is less than 5.");
}
// if both condition is false
else {
System.out.println("The number is 5.");
}
}
}
Output:public static void main(String[] args) {
int my_number = 5;
// checks if number is greater than 5
if (my_number > 5) {
System.out.println("The number is greater than 5.");
}
// checks if number is less than 5
else if (my_number < 5) {
System.out.println("The number is less than 5.");
}
// if both condition is false
else {
System.out.println("The number is 5.");
}
}
}
The number is 5.
Java Nested if..else Statement
In Java programms, it is also possible to use if..else inside an if...else statement.
Example:
public class Main {
public static void main(String[] args) {
// double type variables
Double a1 = -1.0, a2 = 4.5, a3 = -5.3, largest;
// checks if a1 greater than or equal to a2
if (a1 >= a2) {
// if...else statement inside the if block
// checks if a1 is greater than or equal to a3
if (a1 >= a3) {
largest = a1;
}
else {
largest = a3;
}
} else {
// if..else statement inside else block
// checks if a2 is greater than or equal to a3
if (a2 >= a3) {
largest = a2;
}
else {
largest = a3;
}
}
System.out.println("Biggest Number: " + largest);
}
}
public static void main(String[] args) {
// double type variables
Double a1 = -1.0, a2 = 4.5, a3 = -5.3, largest;
// checks if a1 greater than or equal to a2
if (a1 >= a2) {
// if...else statement inside the if block
// checks if a1 is greater than or equal to a3
if (a1 >= a3) {
largest = a1;
}
else {
largest = a3;
}
} else {
// if..else statement inside else block
// checks if a2 is greater than or equal to a3
if (a2 >= a3) {
largest = a2;
}
else {
largest = a3;
}
}
System.out.println("Biggest Number: " + largest);
}
}
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Java if else statement - java
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