Programming languages | Practice Questions

Multiple choice technology programming languages

class Eggs { int doX(Long x, Long y) { return 1; } int doX(long... x) { return 2; } int doX(Integer x, Integer y) { return 3; } int doX(Number n, Number m) { return 4; } public static void main(String[] args) { new Eggs().go(); } void go() { short s = 7; System.out.print(doX(s,s) + " "); System.out.println(doX(7,7)); } } What is the result?

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Multiple choice technology programming languages

You read the following statement in a Java program that compiles and executes. submarine.dive(depth); What can you say for sure?

depth must be an int
dive must be a method.
dive must be the name of an instance field.
submarine must be the name of a class
submarine must be a method.

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Multiple choice technology programming languages

Given: 11.classA { 12. public void process() { System.out.print(”A “); } } 13. class B extends A { 14. public void process() throws RuntimeException { 15. super.process(); 16. if (true) throw new RuntimeException(); 17. System.out.print(“B”); }} 18. public static void main(String[] args) { 19. try { ((A)new B()).process(); } 20. catch (Exception e) { System.out.print(”Exception “); } 21. } What is the result?

Exception
A Exception
A Exception B
A B Exception
Compilation fails because of an error in line 14.
Compilation fails because of an error in line 19.

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Multiple choice technology programming languages

rbo = new ReallyBigObject(); 12. // more code here 13. rbo = null; 14. /* insert code here */ Which statement should be placed at line 14 to suggest that the virtual machine expend effort toward recycling the memory used by the object rbo?

System.gc();
Runtime.gc();
System.freeMemory();
Runtime.getRuntime().growHeap();
Runtime.getRuntime().freeMemory();

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Multiple choice technology programming languages

public class Threads5 { 2. public static void main (String[] args) { 3. new Thread(new Runnable() { 4. public void run() { 5. System.out.print("bar"); 6. }}).start(); 7. } 8. } What is the result?

Compilation fails.
An exception is thrown at runtime.
The code executes normally and prints "bar".
The code executes normally, but nothing prints.

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Multiple choice technology programming languages

import java.util.*; 2. 3. public class LetterASort{ 4. public static void main(String[] args) { 5. ArrayList strings = new ArrayList(); 6. strings.add("aAaA"); 7. strings.add("AaA"); 8. strings.add("aAa"); 9. strings.add("AAaa"); 10. Collections.sort(strings); 11. for (String s : strings) { System.out.print(s + " "); } 12. } 13. } What is the result?

Compilation fails.
aAaA aAa AAaa AaA
AAaa AaA aAa aAaA
AaA AAaa aAaA aAa
aAa AaA aAaA AAaa
An exception is thrown at runtime

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Multiple choice technology programming languages

A JSP file that uses a tag library must declare the tag library first. The tag library is defined using the taglib directive - <%= taglib uri="..." prefix="..."%> Which of the following specifies the correct purpose of prefix attribute. Select the one correct answer.

A. The prefix defines the name of the tag that may be used for a tag library
B. The prefix attribute defines the location of the tag library descriptor file.
C. The prefix attribute should refer to the short name attribute of the tag library file that is defined by the uri attribute of taglib directive.
D. The prefix attribute is used in front of a tagname of a tag defined within the tag library.

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Multiple choice technology programming languages

Which of the elements defined within the taglib element of taglib descriptor file are required. Select the two correct answers.

name
description
validator
tag-class
display-name

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Multiple choice technology programming languages

Which of the following JSP variables are not available within a JSP expression. Select the one correct answer.

out
session
request
response
httpsession
page

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Multiple choice technology programming languages

Which of the following represents a correct syntax for usebean. Select the two correct answers.

G. <jsp:usebean id="fruit scope ="page"/>
H. <jsp:usebean id="fruit type ="String"/>
I. <jsp:usebean id="fruit type ="String" beanName="Fruit"/>
J. <jsp:usebean id="fruit class="Fruit" beanName="Fruit"/>

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