Java If-else Statement

The Java if statement is used to test the condition. It checks boolean condition: true or false. There are various types of if statement in java.

• if statement
• if-else statement
• nested if statement
• if-else-if ladder

Java IF Statement

The Java if statement tests the condition. It executes the if block if condition is true.

Syntax:

1. if(condition){  
2. //code to be executed  
3. }  

Example:

1. public class IfExample {  
2. public static void main(String[] args) {  
3.     int age=20;  
4.     if(age>18){  
5.         System.out.print("Age is greater than 18");  
6.     }  
7. }  
8. }  

Output:

Age is greater than 18

Java IF-else Statement

The Java if-else statement also tests the condition. It executes the if block if condition is true otherwise else block is executed.

Syntax:

1. if(condition){  
2. //code if condition is true  
3. }else{  
4. //code if condition is false  
5. }  

Example:

1. public class IfElseExample {  
2. public static void main(String[] args) {  
3.     int number=13;  
4.     if(number%2==0){  
5.         System.out.println("even number");  
6.     }else{  
7.         System.out.println("odd number");  
8.     }  
9. }  
10. }  

Output:

odd number

Java IF-else-if ladder Statement

The if-else-if ladder statement executes one condition from multiple statements.

Syntax:

1. if(condition1){  
2. //code to be executed if condition1 is true  
3. }else if(condition2){  
4. //code to be executed if condition2 is true  
5. }  
6. else if(condition3){  
7. //code to be executed if condition3 is true  
8. }  
9. ...  
10. else{  
11. //code to be executed if all the conditions are false  
12. }  

Example:

1. public class IfElseIfExample {  
2. public static void main(String[] args) {  
3.     int marks=65;  
4.       
5.     if(marks<50){  
6.         System.out.println("fail");  
7.     }  
8.     else if(marks>=50 && marks<60){  
9.         System.out.println("D grade");  
10.     }  
11.     else if(marks>=60 && marks<70){  
12.         System.out.println("C grade");  
13.     }  
14.     else if(marks>=70 && marks<80){  
15.         System.out.println("B grade");  
16.     }  
17.     else if(marks>=80 && marks<90){  
18.         System.out.println("A grade");  
19.     }else if(marks>=90 && marks<100){  
20.         System.out.println("A+ grade");  
21.     }else{  
22.         System.out.println("Invalid!");  
23.     }  
24. }  
25. }  

Output:

C grade