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Programming with Java Statements
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Understanding Fundamental Statements
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q Assignment statements assign values to variables. q Assignment statements that do not return boolean types will cause the compiler to report an error when used as the expression in an if statement. q Trying to save an invalid literal to a declared primitive type variable will
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q Conditional statements are used for determining the direction of flow based
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q Types of conditional statements include the if, if-then, if-then-else, and switch statements. q The default case statement can be placed anywhere in the body of the switch statement. q The expressions used in if statements must evaluate to boolean values, or
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q Boolean wrapper classes are allowed as expressions in if statements since
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they are unboxed. Remember that unboxing is the automatic production of primitive values from their related wrapper classes when the primitive value is required.
q Iteration statements are designed for iterating through pieces of code. q Iteration statements include the for loop, enhanced for loop, and the while and do-while statements. q The for loop statement has main components that include an initialization
part, an expression part, and an update part.
q The enhanced for loop statement is used for iteration through an iterable
object or array.
q The while loop statement is used for iteration based on a condition. q The do-while statement is used for iteration based on a condition. The
body of this statement is always executed at least once.
q Transfer of control statements interrupt or stop the flow of execution. q The transfer of control statements include the continue, break, and return statements.
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q The continue statement is used to terminate the current iteration of a do-while, while, or for loop, and then continue with the next iteration. q The break statement is used to exit the body of a switch statement
or loop.
q The return statement is used to exit a method and return a specified value. q A block is a sequence of statements within braces for example, { int x=0; int y=1 }.
Implementing Statement-Related Algorithms from Pseudo-code
q Pseudo-code allows algorithm designers to express computer programming
algorithms in a human-readable format.
q Writing pseudo-code allows for the quick and focused production of
algorithms based on logic, not language syntax.
q Java keywords and statement usage structures are used when implementing
pseudo-code algorithms.
q There are no universally accepted standards for writing pseudo-code.
2:
Programming with Java Statements
SElF TEST
Understanding Fundamental Statements
1. Given x is declared with a valid integer, which conditional statement will not compile A. if (x == 0) {System.out.println("True Statement");} B. if (x == 0) {System.out.println("False Statement");} C. if (x == 0) {;} elseif (x == 1) {System.out.println("Valid Statement");} D. if (x == 0) ; else if (x == 1){} else {;} 2. Which is not a type of statement A. Conditional statement B. Assignment statement C. Iteration statement D. Propagation statement 3. What type of statement would be used to code the following equation: y = (m*x) + b A. Conditional statement B. Assignment statement C. Assertion statement D. Transfer of control statement 4. You need to update a value of a hash table (that is, HashMap) where the primary key must equal a specified string. Which statements would you need to use in the implementation of this algorithm A. Iteration statement B. Expression statement C. Conditional statement D. Transfer of control statement 5. Which keyword is part of a transfer of control statement A. if B. return
Self Test
C. do D. assert 6. A switch statement works with which wrapper class/reference type A. Character B. Byte C. Short D. Int 7. Which statements correctly declare boolean variables A. Boolean isValid = true; B. boolean isValid = TRUE; C. boolean isValid = new Boolean (true); D. boolean isValid = 1; 8. Which of the following statements will not compile A. if (true) ; B. if (true) {} C. if (true) {:} D. if (true) {;} 9. Given:
public class Dinner { public static void main (String[] args) { boolean isKeeperFish = false; if (isKeeperFish = true) { System.out.println("Fish for dinner"); } else { System.out.println("Take out for dinner"); } } }
What will be the result of the application s execution A. Fish for dinner will be printed. B. Take out for dinner will be printed. C. A compilation error will occur.
2:
Programming with Java Statements
10. The for loop has been enhanced in Java 5.0. Which is NOT a common term for the improved for loop. A. The for in loop B. The specialized for loop C. The for each loop D. The enhanced for loop
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