University:
Eastern Kentucky University
Course:
CSC 189 | Computing Concepts and Programming
Academic year:

2021
Views:

288

Pages:

8
Author:

ui4s3l4md25

1) The instruction super( ); does which of the following? A) calls the method super as defined in the current class B) calls the method super as defined in the current class'parent class C) calls the method super as defined in java.lang D) calls the constructor as defined in the current class E) calls the constructor as defined in the current class'parent class 2) The instruction this( ); does which of the following? A) calls the method this as defined in the current class B) calls the constructor in the current class'parent class C) calls the method this as defined in java.lang D) calls the constructor as defined in the current class E) it is syntax error 3) Java does not support multiple inheritance, but some of the abilities of multiple inheritance are available by A) importing classes B) implementing interfaces C) overriding parent class methods D) creating aliases E) using public rather than protected or private modifiers 4) If a programmer writes a class wanting it to be extended by another programmer, then this programmer must A) change private methods and instance data to be protected B) change public methods and instance data to be protected C) change all methods to be protected D) change the class to be protected E) none of the above, the programmer does not have to change anything 5) All classes in Java are directly or indirectly subclasses of the: A) Wrapper B) String C) Reference D) this E) Object 6) A variable declared to be of one class can later reference an extended class of that class. This variable is known as A) protected B) derivable C) cloneable D) polymorphic E) none of the above 7) In order to determine the type that a polymorphic variable refers to, the decision is made A) by the programmer at the time the program is written B) by the compiler at compile time C) by the operating system when the program is loaded into memory D) by the Java run-time environment at run time E) by the user at run time 8) Why shouldn't an abstract method be declared final? A) There's nothing wrong with doing so B) Abstract methods cannot be overridden, and they must be if a concrete class ever is to be instantiated C) So long as the Abstract method never actually is used in by any other method, there's no problem with doing this D) So long as the Abstract method is declared in a Class (not an Interface), there's nothing wrong with doing this E) None of the above 9) If you instantiate an Abstract class, the class or object you wind up with A) is also an Abstract class B) is a normal class C) is an Interface D) is a reference to an Object E) can't exist, you cannot instantiate an Abstract class 10) Implement method sorted that returns sorted array of inetegrs leaving original array unchanged. public class Test1 { public static void main(String[] args) { int[] data = new int[10]; for (int i=0; i<10; i++) data[i] = (int)(Math.random()*100); int[] new_data = sorted(data); } // I use selection sort public static int[] sorted(int[] data) { int min; int[] tmp = new int[data.length]; for (int i=0; i0.5 ) p = new Employee(); else p = new Retired(); System.out.println(p.name());//print3 Line 1: Person Line 2: Student Line 3: Employee or Retired (depennds of Math.random()) 15) Finish the implementation of the class Test. public interface DoSomething { public void doIt(String s, double d); } public class Test implements DoSomething { public void doIt(String s, double d) { System.out.println(s+d); // or something else } }