Program Control Statements - Java: A Beginner's Guide - page 82

where the targets of the if and else are single statements. The else clause is optional. The
targets of both the if and else can be blocks of statements. The general form of the if , using
blocks of statements, is
If the conditional expression is true, the target of the if will be executed; otherwise, if it
exists, the target of the else will be executed. At no time will both of them be executed. The
conditional expression controlling the if must produce a boolean result.
To demonstrate the if (and several other control statements), we will create and develop
a simple computerized guessing game that would be suitable for young children. In the first
version of the game, the program asks the player for a letter between A and Z. If the player
presses the correct letter on the keyboard, the program responds by printing the message **
Right ** . The program is shown here: