Java 6 Illuminated: An Active Learning Approach, 2nd Edition

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Do not confuse the equality

operator == (double equal

signs) with the assignment

operator = (one equal

sign).

COMMON ERROR

TRAP

210 CHAPTER 5 Flow of Control,Part 1: Selection

TABLE 5.2 Relational Operators

Relational Operator Type Meaning

< binary is less than

<= binary is less than or equal to

> binary is greater than

>= binary is greater than or equal to

Assuming the user’s input is stored in the char variable playAgain, then if

the user typed ‘y’, the expression evaluates to true; with any other input

value, the expression evaluates to false.

A common error is to use the assignment operator instead of the equality

operator. For example:

playAgain = 'y'

assigns ...