Java programs normally execute statements in order from the top of a method to the bottom.
Let’s say that under some circumstances we do not want to execute statement 2. It is possible to make the execution of statement 2 dependent on some condition. Statement 2 would then only execute if the condition were true. This is referred to as conditional logic.
Section 1 - The if Statement
Let’s say we have a program with two variables x and y. The program prints the value of x. In addition, we want to issue a warning if variable y is greater than x. If y is less than or equal to y, we do not want to issue the warning.
The program has placed the warning statement inside an if statement, which begins with an if clause that contains the keyword if followed by a boolean expression enclosed in parentheses. Note that there is no semicolon after the boolean expression.
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