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If-statements

In Java you can make choices with an if-statement. Actually, you ask the computer something.

if statement java

THEORY

  • For the first question use: if + ( + condition + ) + { + }
    if ( is value bigger than 10 )
    {
    	//you end up in this block of code
    }
  • For all questions in between use: else if + ( + condition + ) + { + }
    else if ( is value smaller than 10 )
    {
    	//you end up in this block of code
    }
  • For the last question use: else + { + }
    else
    {
    	//you end up in this block of code
    }

example 1

We want that the program calculates if the value of “number” is bigger, smaller or equal than 10.

if example java

if (number > 10)
{ 

	//number is bigger than 10

} 

else if (number == 10)
{ 

	//number is equal to 10

}
else
{ 

	//number is smaller than 10

}

Normally programmers write it like this:

if (number > 10) { 
	//number is bigger than 10
} else if (number == 10) { 
	//number is equal to 10
} else { 
	//number is smaller than 10
}

 

EXAMPLE 2

REMARK: working with objects or String; then you should you use the method equals() instead of ==:

if (word.equals("what sup") { 
	//word is "what sup"
} else { 
	//word is not "what sup"
}

 

More Conditions:

You can also do an if-statement with two conditions, using logical operators.

example

void start() {
	int number = 30, number2 = 20, number3 = 30;
	if (number > number2 && number < number3) {
		System.out.printf("%d is between %d and %d ", number, number2, number3);
	} else if (number > number2 && number > number3) {
		System.out.printf("%d is bigger than %d and %d", number, number2, number3);
	} else {
		System.out.printf("%d is not in between %d and %d or bigger than %d and %d", number, number2, number3, number2, number3);
	}
}

30 is smaller than 20 and equal to 30, therefore the output should be, the last else:

output: 30 is not in between 20 and 30 or bigger than 20 and 30

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