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The distinction between the if, if-then, and if-then-else statements may seem blurred. This is partially because the then keyword used in some other programming languages is not used in Java, even though the Java constructs are formally known as ifthen and if-then-else. Let s clarify some confusing points about the if-related statements by providing some facts. The if statement allows for the optional use of the else branch. This may be a little confusing since you may expect the if statement to stand alone without any branches, but it is what it is. The if-then statement must have at least one else if branch. Optionally, an unlimited amount of else if branches may be included. You cannot use an else statement in an if-then statement, or the statement would be considered an if-thenelse statement. The if-then-else statement must have at least one else if branch. The else if branch is not optional, because if it was not present, the statement would be considered to be an if statement that includes the optional else branch.
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The general usage of the if statement: if (expression) statementA; else statementB; In the following example, we look at the most basic structure of an if statement. Here, we check to see if a person (isFisherman) is a fisherman, and if so, the expression associated with the if statement would evaluate to true. Because it is true, the example s fishing trip value (isFishingTrip) is modified to true. No action would have been taken if the isFisherman expression evaluated to false.
boolean isFisherman = true; boolean isFishingTrip = false; if (isFisherman) isFishingTrip = true;
2:
Programming with Java Statements
Let s change the code up a little bit. Here, you will see that a fishing trip will only occur if there are one or more fishermen as the expression reads (fishermen >= 1). See 3 for more details on relationship operators (for example, <, <=, >, >=, ==, !=). We also see that when one or more fishermen evaluates to true, a block of statements will be executed.
int fishermen = 2; boolean isFishingTrip = false; if (fishermen >= 1) { isFishingTrip = true; System.out.print("Going Fishing!"); } $ Going Fishing!
Executing statements in relationship to false conditions is also common in programming. In the following example, when the expression evaluates to false, the statement associated with the else part of the if statement is executed:
boolean isFisherman = false; if (isFisherman) System.out.println("Going fishing!"); else System.out.println("I'm doing anything but fishing!"); $ I'm doing anything but fishing!
The if-then Conditional Statement
The if-then conditional statement also known as the if else if statement is used when multiple conditions need to flow through a decision-based scenario. The general usage of the if-then statement: if (expressionA) statementA; else if (expressionB) statementB; The expressions must evaluate to boolean values. Each statement may optionally be a group of statements enclosed in braces. Let s look at an example. For those not familiar with surf-fishing, when fishing off the beach, a lead pyramid-shaped sinker is used to keep the line on the bottom
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The most important thing to remember about the expression in the if statement is that it can accept any expression that returns a boolean value. Even though relational operators (for example, >=) are commonly used, assignment statements are allowed. Review and understand the following code examples:
boolean b; boolean bValue = (b = true); // Evaluates to true if (bValue) System.out.println("TRUE"); else System.out.println("FALSE"); if (bValue = false) System.out.println("TRUE"); else System.out.println("FALSE"); if (bValue == false) System.out.println("TRUE"); else System.out.println("FALSE"); $ TRUE $ FALSE $ TRUE
You also need to be aware that the assignment statements of all primitives will return their primitive values. So, if it s not an assignment of a boolean type, then the return value will not be boolean. As such, the following code will not compile:
int i; // Valid declaration int iValue = (i=1); // Valid evaluation to int /* Fails here as boolean value is expected in the expression */ if (iValue) {};
Similarly, this code will not compile:
/* Fails here as boolean value is expected in the expression */ if (i=1) {};
The compile error will look like this:
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