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Understanding Fundamental Statements
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The expression of the switch statement must evaluate to byte, short, int, or char. Wrapper classes of type Byte, Short, Int, and Character are also allowed since they are automatically unboxed to primitive types. Enumerated types are permitted as well. The general usage of the switch statement: switch (expression) { case valueA: // Sequences of statements break; case valueB: // Sequences of statements break; default: // Sequences of statements } Let s take a look at a complete switch conditional statement example. In the following generateRandomFish method, we use a random number generator to produce a value that will be used in the switch expression. The number generated will either be a 0, 1, 2, or 3. The switch statement will use the value to match it to the value of a case statement. In the example, a String with the name randomFish will be set depending on the case matched. In this example, the only possible value that does not have a matching case statement is the number 3. Therefore, this condition will be handled by the default statement. Whenever a break statement is hit, it will cause immediate termination of the switch statement.
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public String generateRandomFish() { String randomFish; Random randomObject = new Random(); int randomNumber = randomObject.nextInt(4); switch (randomNumber) { case 0: randomFish = "Blue Fish"; break; case 1: randomFish = "Red Drum"; break;
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Programming with Java Statements
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case 2: randomFish = "Striped Bass"; break; default: randomFish = "Unknown Fish Type"; break; } return randomFish; }
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The case statements can be organized in any manner. The default case is often listed last for code readability. Remember that without break statements, the switch block will continue with its fall-through, from the point that the condition has been met. The following code is a valid switch conditional statement that uses an enumeration type for its expression value:
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private enum ClamBait {FRESH,SALTED,ARTIFICIAL} ... ClamBait bait = ClamBait.SALTED; switch (bait) { default: System.out.println("No bait"); break; case FRESH: System.out.println("Fresh clams"); break; case SALTED: System.out.println("Salted clams"); break; case ARTIFICIAL: System.out.println("Artificial clams"); break; }
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Knowing what you can and cannot do with switch statements will help expedite your development efforts.
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Iteration Statements
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Iteration statements are used when there is a need to iterate through pieces of code. Iteration statements include the for loop, enhanced for loop, the while and the do-while statements. The break statement is used to exit the body of any
Understanding Fundamental Statements
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To ensure your statement is bug free, which type of Both break statements and the default statement statements should you include within the switch are commonly used in the switch. Forgetting these statements can lead to improper fall-throughs or unhandled conditions. Note that many bug-finding tools will flag missing default statements. You wish to use a range in a case statement (for instance, case 7-35). Is this a valid feature in Java, as it is with other languages You wish to use the switch statement, using String values where the expression is expected, as is possible with other languages. Is this a valid feature in Java Ranges in case statements are not allowed. Consider setting up a condition in an if statement. For example:
if (x >=7 && x <=35){}
Strings are not valid at the decision point for switch statements. Consider using an if statement instead. For example: if (strValue.equals("S1")){}
iteration statement. The continue statement is used to terminate the current iteration and continue with the next iteration. The iteration statements detailed in Table 2-4 will be seen on the exam.
TABlE 2-4
Iteration Statements
Formal Name
for loop
Keywords
for, break (optional), continue
Main Expression Components
Example
Initializer, expression, for (i=0; i<j; i++) {} update mechanism
(optional) Enhanced for loop
for, break (optional), continue
Element, array, or collection
for (Fish f : listOfFish) {};
(optional)
while
while , break (optional), continue
Boolean expression
while (value == 1) { }
(optional)
do-while
Boolean expression do, while, break (optional), continue (optional)
do { } while (value == 1);
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