OTHER OPERATORS: new, [], instanceof in Java

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515 OTHER OPERATORS: new, [], instanceof
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514 The Conditional Operator: :
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The ternary conditional operator allows conditional expressions to be defined The operator has the following syntax: <condition> <expression1> : <expression2> If the boolean expression <condition> is true then <expression1> is evaluated; otherwise, <expression2> is evaluated Of course, <expression1> and <expression2> must evaluate to values of compatible types The value of the expression evaluated is returned by the conditional expression
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boolean leapYear = false; int daysInFebruary = leapYear 29 : 28; // 28
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The conditional operator is the expression equivalent of the if-else statement (Section 62, p 205) The conditional expression can be nested and the conditional operator associates from right to left:
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(a b c d:e:f:g) evaluates as (a (b (c d:e):f):g)
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515 Other Operators: new, [], instanceof
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The new operator is used to create objects, ie, instances of classes and arrays It is used with a constructor call to instantiate classes (see Section 34, p 48), and with the [] notation to create arrays (see Section 36, p 70) It is also used to instantiate anonymous arrays (see Section 36, p 74), and anonymous classes (see Section 85, p 377)
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Pizza onePizza = new Pizza(); // Create an instance of the Pizza class
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The [] notation is used to declare and construct arrays and also to access array elements (see Section 36, p 69)
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int[] anArray = new int[5];// Declare and construct an int array of 5 elements anArray[4] = anArray[3]; // Element at index 4 gets value of element at index 3
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The boolean, binary, and infix operator instanceof is used to test the type of an object (see Section 711, p 327)
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Pizza myPizza boolean test1 boolean test2 boolean test3 = = = = new Pizza(); myPizza instanceof Pizza; // True "Pizza" instanceof Pizza; // Compile error String is not Pizza null instanceof Pizza; // Always false null is not an instance
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CHAPTER 5: OPERATORS AND EXPRESSIONS
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Summary
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The following information was included in this chapter: type conversion categories and conversion contexts, and which conversions are permissible in each conversion context operators in Java, including precedence and associativity rules defining and evaluating arithmetic and boolean expressions, and the order in which operands and operators are evaluated
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Programming Exercise
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51 The program below is supposed to calculate and print the time it takes for light to travel from the sun to the earth It contains some logical errors Fix the program so that it will compile and print the correct result when run
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//Filename: Sunlightjava public class Sunlight { public static void main(String[] args) { // Distance from sun (150 million kilometers) int kmFromSun = 150000000; int lightSpeed = 299792458; // meters per second // Convert distance to meters int mFromSun = kmFromSun * 1000; int seconds = mFromSun / lightSpeed; Systemoutprint("Light will use "); printTime(seconds); Systemoutprintln(" to travel from the sun to the earth"); } public static void printTime(int sec) { int min = sec / 60; sec = sec - (min * 60); Systemoutprint(min + " minute(s) and " + sec + " second(s)"); } }
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Control Flow
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Exam Objectives 21 Develop code that implements an if or switch statement; and identify legal argument types for these statements 22 Develop code that implements all forms of loops and iterators, including the use of for, the enhanced for loop (for-each), do, while, labels, break, and continue; and explain the values taken by loop counter variables during and after loop execution 23 Develop code that makes use of assertions, and distinguish appropriate from inappropriate uses of assertions 24 Develop code that makes use of exceptions and exception handling clauses (try, catch, finally), and declares methods and overriding methods that throw exceptions 25 Recognize the effect of an exception arising at a specified point in a code fragment Note that the exception may be a runtime exception, a checked exception, or an error 26 Recognize situations that will result in any of the following being thrown: ArrayIndexOutOfBoundsException, ClassCastException, IllegalArgumentException, IllegalStateException, NullPointerException, NumberFormatException, AssertionError, ExceptionInInitializerError, StackOverflowError, or NoClassDefFoundError Understand which of these are thrown by the virtual machine and recognize situations in which others should be thrown programmatically Supplementary Objectives Understand method execution Understand exception propagation through the runtime stack