Question # 1 Which two statements correctly describe checked exception?
A. These are exceptional conditions that a well-written application should anticipate and recover from.
B. These are exceptional conditions that are external to the application, and that the application usually cannot anticipate or recover from.
C. These are exceptional conditions that are internal to the application, and that the application usually cannot anticipate or recover from.
D. Every class that is a subclass of RuntimeException and Error is categorized as checked exception.
E. Every class that is a subclass of Exception, excluding RuntimeException and its subclasses, is categorized as checked exception.
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B. These are exceptional conditions that are external to the application, and that the application usually cannot anticipate or recover from.
D. Every class that is a subclass of RuntimeException and Error is categorized as checked exception.
Answer Description Checked exceptions: * (B) represent invalid conditions in areas outside the immediate control of the program (invalid user input, database problems, network outages, absent files) * are subclasses of Exception It's somewhat confusing, but note as well that RuntimeException (unchecked) is itself a subclass of Exception (checked). * a method is obliged to establish a policy for all checked exceptions thrown by its implementation (either pass the checked exception further up the stack, or handle it somehow) Reference: Checked versus unchecked exceptions
Question # 2 Given the following four Java file definitions: // Foo.java package facades; public interface Foo { } // Boo.java package facades; public interface Boo extends Foo { } // Woofy.java package org.domain // line n1 public class Woofy implements Boo, Foo { } // Test.java package.org; public class Test { public static void main(String[] args) { Foo obj=new Woofy(); Which set modifications enable the code to compile and run?
A. At line n1, Insert: import facades;At line n2, insert:import facades;import org.domain;
B. At line n1, Insert: import facades.*;At line n2, insert:import facades;import org.*;
C. At line n1, Insert: import facades.*;At line n2, insert:import facades.Boo;import org.*;
D. At line n1, Insert: import facades.Foo, Boo;At line n2, insert:import org.domain.Woofy;
E. At line n1, Insert: import facades.*;At line n2, insert:import facades;import org.domain.Woofy;
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E. At line n1, Insert: import facades.*;At line n2, insert:import facades;import org.domain.Woofy;
Question # 3 Given: package p1; public interface DoInterface { void method1(int n1); // line n1 } package p3; import p1.DoInterface; public class DoClass implements DoInterface { public DoClass(int p1) { } public void method1(int p1) { } // line n2 private void method2(int p1) { } // line n3 } public class Test { public static void main(String[] args) { DoInterface doi= new DoClass(100); // line n4 doi.method1(100); doi.method2(100); } } Which change will enable the code to compile?
A. Adding the public modifier to the declaration of method1 at line n1
B. Removing the public modifier from the definition of method1 at line n2
C. Changing the private modifier on the declaration of method 2 public at line n3
D. Changing the line n4 DoClass doi = new DoClass ( );
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C. Changing the private modifier on the declaration of method 2 public at line n3
Answer Description Private members (both fields and methods) are only accessible inside the class they are declared or inside inner classes. private keyword is one of four access modifier provided by Java and its a most restrictive among all four e.g. public, default(package), protected and private. Read more: http://javarevisited.blogspot.com/2012/03/private-in-java-why-should-youalways. html#ixzz3Sh3mOc4D
Question # 4 Given the code fragment: What is the result?
A. Found Red Found Default
B. Found Teal
C. Found Red Found Blue Found Teal
D. Found Red Found Blue Found Teal Found Default E. Found Default
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Question # 5 What is the proper way to defined a method that take two int values and returns their sum as an int value?
A. int sum(int first, int second) { first + second; }
B. int sum(int first, second) { return first + second; }
C. sum(int first, int second) { return first + second; }
D. int sum(int first, int second) { return first + second; }
E. void sum (int first, int second) { return first + second; }
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D. int sum(int first, int second) { return first + second; }
Question # 6 Given:
A. Option A
B. Option B
C. Option C
D. Option D
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Question # 7 Given: public class Painting { private String type; public String getType() { return type; } public void setType(String type) { this.type = type; } public static void main(String[] args) { Painting obj1 = new Painting(); Painting obj2 = new Painting(); obj1.setType(null); obj2.setType("Fresco"); System.out.print(obj1.getType() + " : " + obj2.getType()); } } What is the result?
A. Fresco
B. null : Fresco
C. Fresco : Fresco
D. A NullPointerException is thrown at runtime
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Question # 8 Given the code fragment And given the requirements: If the value of the qty variable is greater than or equal to 90, discount = 0.5 If the value of the qty variable is between 80 and 90, discount = 0.2 Which two code fragments can be independently placed at line n1 to meet the requirements?
A. Option A
B. Option B
C. Option C
D. Option D
E. Option E
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