What is the result of compiling and running the following program in Java

Painting QR Code 2d barcode in Java What is the result of compiling and running the following program
What is the result of compiling and running the following program
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public class RQ800_60 { static void printFirst(Integer ints) { Systemoutprintln("Integer: " + ints[0]); } static void printFirst(Number nums) { Systemoutprintln("Number: " + nums[0]); } static void printFirst(Object objs) { Systemoutprintln("Object: " + objs[0]); } public static void main(String[] args) { printFirst(10); printFirst((byte)20); printFirst('3', '0'); printFirst("40"); printFirst((short)50, 55); printFirst((Number[])new Integer[] {70, 75}); } }
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Select the one correct answer (a) The program does not compile because of ambiguous method calls (b) The program compiles and prints:
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711: REFERENCE CASTING AND THE instanceof OPERATOR
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Integer: 10 Integer: 20 Integer: 3 Object: 40 Integer: 50 Number: 70
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(c) The program compiles and prints:
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Integer: 10 Number: 20 Object: 3 Object: 40 Number: 50 Number: 70
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(d) The program compiles and prints:
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Integer: 10 Integer: 20 Integer: 3 Object: 40 Number: 50 Number: 70
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What is the result of compiling and running the following program
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public class RQ800_80 { static String compute(long ls) static String compute(Long ls) static String compute(Integer i1, Integer i2) static String compute(Long l1, Long l2) static String compute(Number n1, Number n2) { { { { { return return return return return "ONE"; } "TWO"; } "THREE"; } "FOUR"; } "FIVE"; }
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public static void main(String[] args) { Systemoutprintln(compute((byte)5, (byte)10) + ", " + compute(5, 10)); Systemoutprintln(compute(5L, 10) + ", " + compute(5L, 10L)); } }
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Select the one correct answer (a) The program does not compile because of errors (b) The program compiles and prints:
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THREE, THREE FOUR, FOUR
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(c) The program compiles and prints:
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FIVE, THREE FIVE, FOUR
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(d) The program compiles and prints:
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FIVE, THREE ONE, TWO
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(e) The program compiles and prints:
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ONE, THREE ONE, ONE
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CHAPTER 7: OBJECT-ORIENTED PROGRAMMING
712 Polymorphism and Dynamic Method Lookup
Which object a reference will actually denote during runtime cannot always be determined at compile time Polymorphism allows a reference to denote objects of different types at different times during execution A supertype reference exhibits polymorphic behavior since it can denote objects of its subtypes When a non-private instance method is invoked on an object, the method definition actually executed is determined both by the type of the object at runtime and the method signature Dynamic method lookup is the process of determining which method definition a method signature denotes during runtime, based on the type of the object However, a call to a private instance method is not polymorphic Such a call can only occur within the class and gets bound to the private method implementation at compile time The inheritance hierarchy depicted in Figure 74 is implemented in Example 714 The implementation of the method draw() is overridden in all subclasses of the class Shape The invocation of the draw() method in the two loops at (3) and (4) in Example 714 relies on the polymorphic behavior of references and dynamic method lookup The array shapes holds Shape references denoting a Circle, a Rectangle and a Square, as shown at (1) At runtime, dynamic lookup determines the draw() implementation to execute, based on the type of the object denoted by each element in the array This is also the case for the elements of the array drawables at (2), which holds IDrawable references that can be assigned the reference value of any object of a class that impleFigure 74
Type Hierarchy to Illustrate Polymorphism
interface IDrawable draw()
Shape draw()
Map draw()
Rectangle draw()
Circle draw()
Square draw()
712: POLYMORPHISM AND DYNAMIC METHOD LOOKUP
ments the IDrawable interface The first loop will still work without any change if objects of new subclasses of the class Shape are added to the array shapes If they did not override the draw() method, an inherited version of the method would be executed This polymorphic behavior applies to the array drawables, where the subtype objects are guaranteed to have implemented the IDrawable interface Polymorphism and dynamic method lookup form a powerful programming paradigm that simplifies client definitions, encourages object decoupling, and supports dynamically changing relationships between objects at runtime
Example 714 Polymorphism and Dynamic Method Lookup interface IDrawable { void draw(); } class Shape implements IDrawable { public void draw() { Systemoutprintln("Drawing a Shape"); } } class Circle extends Shape { public void draw() { Systemoutprintln("Drawing a Circle"); } } class Rectangle extends Shape { public void draw() { Systemoutprintln("Drawing a Rectangle"); } } class Square extends Rectangle { public void draw() { Systemoutprintln("Drawing a Square"); } } class Map implements IDrawable { public void draw() { Systemoutprintln("Drawing a Map"); } } public class PolymorphRefs { public static void main(String[] args) { Shape[] shapes = {new Circle(), new Rectangle(), new Square()}; IDrawable[] drawables = {new Shape(), new Rectangle(), new Map()}; Systemoutprintln("Draw shapes:"); for (Shape shape : shapes) shapedraw(); Systemoutprintln("Draw drawables:"); for (IDrawable drawable : drawables) drawabledraw(); } }
// (1) // (2)
// (3)
// (4)
Output from the program:
Draw shapes:
342 Drawing a Circle Drawing a Rectangle Drawing a Square Draw drawables: Drawing a Shape Drawing a Rectangle Drawing a Map