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programming languages Online Quiz - 318

Description: programming languages Online Quiz - 318
Number of Questions: 20
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Tags: programming languages
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class Abc { static { System.out.print("Static block "); display(); } public void display() { System.out.print("Display block "); } public static void main(String a[]) { System.out.print("Starting of Main block "); Abc abc=new Abc(); System.out.print("In the Main block "); abc.display(); } }

  1. Starting of Main block Static block In the Main block Display block

  2. Static block Display block Starting of Main block In the Main block Display block

  3. Error: Non static method cannot accessed from static context

  4. Starting of Main block In the Main block Display block


Correct Option: B

Given: 11. // insert code here 12. private N min, max; 13. public N getMin() { return min; } 14. public N getMax() { return max; } 15. public void add(N added) { 16. if (min == null || added.doubleValue() max.doubleValue()) 19. max = added; 20. } 21. } Which two, inserted at line 11, will allow the code to compile? (Choose two.)

  1. public class MinMax> {

  2. public class MinMax extends Number> {

  3. public class MinMax {

  4. public class MinMax {

  5. public class MinMax extends Object> {

  6. public class MinMax {


Correct Option: D,F

Given classes defined in two different files: 1. package util; 2. public class BitUtils { 3. public static void process(byte[]) { /* more code here */ } 4. } 1. package app; 2. public class SomeApp { 3. public static void main(String[] args) { 4. byte[] bytes = new byte[256]; 5. // insert code here 6. } 7. } What is required at line 5 in class SomeApp to use the process method of BitUtils?

  1. process(bytes);

  2. BitUtils.process(bytes);

  3. util.BitUtils.process(bytes);

  4. SomeApp cannot use methods in BitUtils.

  5. import util.BitUtils.*; process(bytes);


Correct Option: C

Given: 1. public class Threads4 { 2. public static void main (String[] args) { 3. new Threads4().go(); 4. } 5. public void go() { 6. Runnable r = new Runnable() { 7. public void run() { 8. System.out.print(”foo”); 9. } 10. }; 11. Thread t = new Thread(r); 12. t.start(); 13. t.start(); 14. } 15. } What is the result?

  1. Compilation fails.

  2. An exception is thrown at runtime.

  3. The code executes normally and prints ‘foo”.

  4. The code executes normally, but nothing is printed.


Correct Option: B

class Abc { int i=initialize(369); int j=initialize(); public int initialize() { return 318; } public void initialize(int i) { this.i=i; } public static void main(String a[]) { Abc abc=new Abc(); System.out.println("i="+abc.i); abc.initialize(369); System.out.println("after i="+abc.i); System.out.println("j="+abc.j); } }

  1. Error: Non static method intialize cannot accessed from static context main

  2. Error: Method initialize is already defined

  3. i=0 after i=369 j=318

  4. Error: incompatible types


Correct Option: D

Given classes defined in two different files: 1. package util; 2. public class BitUtils { 3. private static void process(byte[] b) { } 4. } 1. package app; 2. public class SomeApp { 3. public static void main(String[] args) { 4. byte[] bytes = new byte[256]; 5. // insert code here 6. } 7. } What is required at line 5 in class SomeApp to use the process method of BitUtils?

  1. process(bytes);

  2. BitUtils.process(bytes);

  3. app.BitUtils.process(bytes);

  4. util.BitUtils.process(bytes);

  5. import util.BitUtils. *; process(bytes);

  6. SomeApp cannot use the process method in BitUtils.


Correct Option: F

What will this program print out ? class Base{ int value = 0; Base(){ addValue(); } void addValue(){ value += 10; } int getValue(){ return value; } } class Derived extends Base{ Derived(){ addValue(); } void addValue(){ value += 20; } } public class Test { public static void main(String[] args){ Base b = new Derived(); System.out.println(b.getValue()); } }

  1. 10

  2. 20

  3. 30

  4. 40


Correct Option: D

What is the result of compiling and running this program? class Clove{ void quality(Clove m){ System.out.println("Clove is nice"); } } class Mint extends Clove{ void quality(Mint c){ System.out.println("Mint is ok"); } } class Sage extends Mint{ void quality(Sage h){ System.out.println("Sage is average"); } } public class Test{ public static void main(String[] args){ Clove h = new Sage(); Mint c = new Sage(); c.quality(h); } }

  1. prints "Clove is nice"

  2. prints "Mint is ok"

  3. prints "Sage is average"

  4. Class cast Exception at runtime.


Correct Option: A

A class games.cards.Poker is correctly defined in the jar file Poker.jar. A user wants to execute the main method of Poker on a UNIX system using the command: java games.cards.Poker What allows the user to do this? A. put Poker.jar in directory /stuff/java, and set the CLASSPATH to include /stuff/java B. put Poker.jar in directory /stuff/java, and set the CLASSPATH to include /stuff/java/.jar C. Put Poker.jar in directory /stuff/java, and set the CLASSPATH to include /stuff/java/Poker.jar D. put Poker.jar in directory /stuff/java/games/cards, and set the CLASSPATH to include /stuff/java E. put Poker.jar in directory /stuff/java/games/cards, and set the CLASSPATH to include /stuffijava/.jar F. put Poker.jar in directory /stuff/java/games/cards, and set the CLASSPATH to include /stuff/java/Poker.jar

  1. A

  2. B

  3. C

  4. D

  5. E

  6. F


Correct Option: C

Given: 11. public static void test(String str) { 12. int check = 4; 13. if (check = str.length()) { 14. System.out.print(str.charAt(check -= 1) +“, “); 15. } else { 16. System.out.print(str.charAt(0) + “, “); 17. } 18. } and the invocation: 21. test(”four”); 22. test(”tee”); 23. test(”to”); What is the result?

  1. r, t, t,

  2. r, e, o,

  3. Compilation fails.

  4. An exception is thrown at runtime.


Correct Option: C

Given: 11. public static void test(String str) { 12. int check = 4; 13. if (check = str.length()) { 14. System.out.print(str.charAt(check -= 1) +“, “); 15. } else { 16. System.out.print(str.charAt(0) + “, “); 17. } 18. } and the invocation: 21. test(”four”); 22. test(”tee”); 23. test(”to”); What is the result?

  1. r, t, t,

  2. r, e, o,

  3. Compilation fails.

  4. An exception is thrown at runtime.


Correct Option: C

Which of the following is not a joke from Chet Haase's humor blog:

  1. What do you call it when a chip manufacturer loses money? -- A cash miss.

  2. What do you call someone who has to use a dull web application? --Bored to tiers.

  3. What does a hungry vegetarian say? --"I´m so hungry, I could eat a tree."

  4. Always wear protective goggles when operating a weed-eater, working with a power tool, or teasing your wife.


Correct Option: C

In which cases would you use an outer join?

  1. The tables being joined have NOT NULL columns.

  2. The tables being joined have only matched data.

  3. The columns being joined have NULL values.

  4. The tables being joined have only unmatched data.

  5. The tables being joined have both matched and unmatched data.

  6. Only when the tables have a primary key/foreign key relationship.


Correct Option: C,E

Which constraint can be defined only at the column level?

  1. UNIQUE

  2. NOT NULL

  3. CHECK

  4. PRIMARY KEY

  5. FOREIGN KEY


Correct Option: B

The user Alice wants to grant all users query privileges on her DEPT table. Which SQL statement accomplishes this?

  1. GRANT select ON dept TO ALL_USERS;

  2. GRANT select ON dept TO ALL;

  3. GRANT QUERY ON dept TO ALL_USERS

  4. GRANT select ON dept TO PUBLIC;

  5. GRANT QUERY ON dept TO PUBLIC;


Correct Option: D

Which view should a user query to display the columns associated with the constraints on a table owned by the user?

  1. USER_CONSTRAINTS

  2. USER_OBJECTS

  3. ALL_CONSTRAINTS

  4. USER_CONS_COLUMNS

  5. USER_COLUMNS


Correct Option: D

Which statements about subqueries are true?

  1. A subquery should retrieve only one row.

  2. A subquery can retrieve zero or more rows.

  3. Subqueries CANNOT be nested by more than two levels.

  4. A subquery can be used only in SQL query statements.

  5. A subquery CANNOT be used in an SQL query statement that uses group functions.

  6. When a subquery is used with an inequality comparison operator in the outer SQL statement,


Correct Option: B,F

Which statements are true about constraints?

  1. The UNIQUE constraint does not permit a null value for the column.

  2. The PRIMARY KEY and FOREIGN KEY constraints create a UNIQUE index.

  3. The NOT NULL constraint ensures that null values are not permitted for the column.

  4. A UNIQUE index gets created for columns with PRIMARY KEY and UNIQUE constraints.


Correct Option: A,C

Which three are true?

  1. A MERGE statement is used to merge the data of one table with data from another.

  2. A MERGE statement can be used to update existing rows in a table.

  3. A MERGE statement replaces the data of one table with that of another.

  4. A MERGE statement can be used to insert new rows into a table.


Correct Option: A,C,D

Which functions are available in SQL?

  1. string and date

  2. character and numeric

  3. integer and conversion

  4. calendar and date

  5. date and conversion

  6. translation and date


Correct Option: B,E
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