Groovy - If else Statement

---

---

The next decision-making statement we will see is the if/else statement. The general form of this statement is −

if(condition) { 
   statement #1 
   statement #2 
   ... 
} else{ 
   statement #3 
   statement #4  
}

The general working of this statement is that first a condition is evaluated in the if statement. If the condition is true it then executes the statements thereafter and stops before the else condition and exits out of the loop. If the condition is false it then executes the statements in the else statement block and then exits the loop. The following diagram shows the flow of the if statement.

Example - Usage of if else statement

Following is an example of a if/else statement −

Example.groovy

class Example { 
   static void main(String[] args) { 
      // Initializing a local variable 
      int a = 2
		
      //Check for the boolean condition 
      if (a<100) { 
         //If the condition is true print the following statement 
         println("The value is less than 100"); 
      } else { 
         //If the condition is false print the following statement 
         println("The value is greater than 100"); 
      } 
   } 
}

Output

In the above example, we are first initializing a variable to a value of 2. We are then evaluating the value of the variable and then deciding on which println statement should be executed. The output of the above code would be

The value is less than 100.

Example - Usage of if else if statement

Following is an example of a if else if statement −

Example.groovy

class Example {

   static void main(String[] args) {
      int x = 30;

      if( x == 10 ) {
         System.out.print("Value of X is 10");
      }else if( x == 20 ) {
         System.out.print("Value of X is 20");
      }else if( x == 30 ) {
         System.out.print("Value of X is 30");
      }else {
         System.out.print("This is else statement");
      }
   }
}

Output

In the above example, we are first initializing a variable to a value of 30. We are then evaluating the value of the variable and then deciding on which println statement should be executed. The output of the above code would be

Value of X is 30

Example - Usage of if else if statement

Following is an example of a if else if statement −

Example.groovy

class Example {

   static void main(String[] args) {
      int x = 20;

      if( x == 10 ) {
         System.out.print("Value of X is 10");
      } else if( x == 20 ) {
         System.out.print("Value of X is 20");
      } else {
         System.out.print("This is else statement");
      }
   }
}

Output

In the above example, we are first initializing a variable to a value of 20. We are then evaluating the value of the variable and then deciding on which println statement should be executed. The output of the above code would be

Value of X is 20

Example - Usage of multiple if else if statement

Following is an example of multiple if else if statement −

Example.groovy

class Example {

   static void main(String[] args) {
      double x = 30.0;

      if( x == 10.0 ) {
         System.out.print("Value of X is 10.0");
      }else if( x == 20.0 ) {
         System.out.print("Value of X is 20.0");
      }else if( x == 30.0 ) {
         System.out.print("Value of X is 30.0");
      }else {
         System.out.print("This is else statement");
      }
   }
}

Output

In the above example, we are first initializing a variable to a value of 30.0. We are then evaluating the value of the variable and then deciding on which println statement should be executed. The output of the above code would be

Value of X is 30.0