Statements - Beginning Java 8 Fundamentals - page 139

Figure 5-1. Execution of an if-else statement
Suppose you have three int variables, num1 , num2 , and num3 . You want to add 10 to num2 and num3 if num1 is
greater than 50 . Otherwise, you want to subtract 10 from num2 and num3 . You may try the following snippet of code,
which is incorrect:
if (num1 > 50)
num2 = num2 + 10;
num3 = num3 + 10;
else
num2 = num2 - 10;
num3 = num3 - 10;
The snippet of code will generate a compiler error. What is wrong with this code? You can place only one
statement between if and else in an if-else statement. This is the reason that the statement num3 = num3 + 10;
caused a compile-time error. In fact, you can always associate only one statement with the if part in an if-else
statement or in a simple if statement. This is also true for the else part. In the above piece of code, only num2 =
num2 - 10; is associated with the else part; the last statement, num3 = num3 - 10; , is not associated with the else
part. You want to execute two statements when num1 is greater than 50 or not. In this case, you need to bundle two
statements into one block statement, like so:
if (num1 > 50) {
num2 = num2 + 10;
num3 = num3 + 10;
}
else {
num2 = num2 - 10;
num3 = num3 - 10;
}