Java Unique Test 3 Code 819

Question: Given that SomeException is a checked exception, consider the following code:

//in file A.java
public class A{
protected void m() throws SomeException{}
}

//in file B.java
public class B extends A{
public void m(){ }
}

//in file TestClass.java
public class TestClass{
public static void main(String[] args){
//insert code here. //1
}
}

Which of the following options can be inserted at //1 without resulting in any compilation or runtime errors?

Select 1 option(s)

Question: What is the result of executing the following fragment of code:

var b1 = false;
var b2 = false;
if (b2 = b1 != b2){
System.out.println("true");
} else{
System.out.println("false");
}

Select 1 option(s)

Question: Given:

class Base{
public Collection getCollection(T t, Integer n)
{
return new ArrayList();
}
}

class Derived extends Base{

//public List getCollection(T t, Integer m) { return new ArrayList(); }; //1

//public Stream getCollection(T t, Integer m) { return new ArrayList(); }; //2

//public void getCollection(T t, Integer m) { return new ArrayList(); }; //3

//public List getCollection(String t, Integer m) { return new ArrayList(); }; //4
}

Identify correct statements about the methods defined in Derived assuming they are uncommented one at a time individually.

Select 1 option(s)

Question: Which of the following statements are valid?

Select 3 option(s)

Question: Which of the following are correct about "encapsulation"?

Select 2 option(s)

Question: An application program collects a bunch of tasks in an list and submits this list to a task execution service. This service keeps running in the background as a system process and executes the tasks by launching a thread for the list of tasks. The following code shows how the execution service processes the tasks:

public class BackgroundExecutionService {

public void submitTask(final List tasks, final AccessControlContext acc){

new Thread(){ public void run(){

AccessController.doPrivileged(
new PrivilegedAction() {
public Void run() {
for(Task t : tasks){

// process task t

}
}
}, acc);

}.start();

...other irrelevant code

}

Identify correct statements.

Select 1 option(s)

Question: Consider the following code:

public class TestClass {

//define tester method here

public static void main(String[] args) throws Exception {
var tc = new TestClass();
while(tc.tester()){
System.out.println("running...");
}
}
}

Which of the following options would be a valid implementation of tester() method?

Select 2 option(s)

Question: Which of the following are good practices from security perspective?

Select 3 option(s)

Question: What will the following code print when run?

class A{
String value = "test";
A(String val){
this.value = val;
}
}
public class TestClass {
public static void main(String[] args) throws Exception {
new A("new test").print();
}
}

Select 1 option(s)

Question: What will the following code print?

DateTimeFormatter df = DateTimeFormatter.ofPattern("eeee");
LocalDate d = LocalDate.of(2000, 1, 1); //assume that it was Saturday on this date
System.out.println(df.format(d));

Select 1 option(s)

Question: Given:

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface DebugInfo {
String value();
String[] params();
String date();
int depth();
}

Which of the following options correctly uses the above annotation?

Select 1 option(s)

Question: What will the following code print if file test1.txt exists but test2.txt doesn't exist?

public class FileCopier {

public static void copy1(Path p1, Path p2) throws Exception {
Files.copy(p1, p2, StandardCopyOption.COPY_ATTRIBUTES, StandardCopyOption.REPLACE_EXISTING);
}

public static void main(String[] args) throws Exception {
var p1 = Paths.get("c:\\temp\\test1.txt");
var p2 = Paths.get("c:\\temp\\test2.txt");
copy1(p1, p2);
if(Files.isSameFile(p1, p2)){
System.out.println("file copied");
}else{
System.out.println("unable to copy file");
}
}
}

Select 1 option(s)

Question: Which of the following options will print 10?

Select 2 option(s)

Question: What will the following code print when run?

import java.nio.file.Path;
import java.nio.file.Paths;
public class PathTest {
public static void main(String[] args) {
var p1 = Paths.get("c:\\code\\java\\PathTest.java");
System.out.println(p1.getName(3).toString());
}
}

Select 1 option(s)

Question: Assuming that a file named "a.java" exists in c:\pathtest\ as well as in c:\pathtest\dir2, what will happen when the following code is compiled and run?

//imports not shown
public class MoveTest {

public static void main(String[] args) throws IOException {
Path p1 = Paths.get("c:\\pathtest\\a.java");
Path p2 = Paths.get("c:\\pathtest\\dir2\\a.java");
Files.move(p1, p2, StandardCopyOption.ATOMIC_MOVE);
Files.delete(p1);
System.out.println(p1.toFile().exists()+" "+
p2.toFile().exists());
}
}

Select 1 option(s)

Question: Consider the following class:

public class Parser{
public static void main( String[] args){
try{
int i = 0;
i = Integer.parseInt( args[0] );
}
catch(NumberFormatException e){
System.out.println("Problem in " + i );
}
}
}

What will happen if it is run with the following command line:

java Parser one

Select 1 option(s)

Question: Consider the following code:

class A
{
}
public class TestClass
{
public class A
{
public void m() { }
}
class B extends A
{
B(){ m(); }
}
public static void main(String args[])
{
new TestClass().new A() { public void m() { } }; //1
var tc = new TestClass();
//insert call to A's m() here
}
}

Select 4 option(s)

Question: Given:

public List getList(){
*INSERT CODE HERE*
}

What can be inserted in the above code?

Select 3 option(s)

Question: Given:

public class Data implements Serializable{
int id;

transient LocalDate ld;

private void readObject(ObjectInputStream stream)
throws IOException, ClassNotFoundException {

stream.defaultReadObject();

ld = LocalDate.of(2020,1,1);
}
}

Identify the correct statements about the above code.

Select 1 option(s)

Question: What will be the contents of d at the end of the following code?

Deque d = new ArrayDeque();
d.add(1);
d.push(2);
d.pop();
d.offerFirst(3);
d.remove();
System.out.println(d);

Select 1 option(s)

Question: Given:

abstract class Vehicle{ }
interface Drivable{ }
class Car extends Vehicle implements Drivable{ }
class SUV extends Car { }

Which of the following options will fail to compile?

Select 1 option(s)

Question: Consider the following code:

static void printElements(List... la) { //1
for(List l : la){ //2
System.out.println(l);
}
}

Select 1 option(s)

Question: Consider the following code snippet:

void m1() throws Exception{
try{
// line1
}
catch (IOException e){
throw new SQLException();
}
catch(SQLException e){
throw new InstantiationException();
}
finally{
throw new CloneNotSupportedException(); // CloneNotSupportedException is a checked exception.
}
}

Which of the following statements are true?

Select 2 option(s)

Question: What will the following code print when run?

public class TestClass {
public static void main(String[] args) throws Exception {
var sa = new String[]{"a", "b", "c"};
for(String s : sa){
if("b".equals(s)) continue;
System.out.println(s);
if("b".equals(s)) break;
System.out.println(s+" again");
}
}
}

Select 1 option(s)

Question: Given that Book is a valid class with appropriate constructor and getPrice method that returns a double, what can be inserted at //1 so that it will sum the price of all the books that are priced greater than 5.0?

List books = Arrays.asList(
new Book("Gone with the wind", 10.0),
new Book("Atlas Shrugged", 10.0),
new Book("Freedom at Midnight", 5.0),
new Book("Gone with the wind", 5.0)
);

//1 INSERT CODE HERE

System.out.println(sum);

Select 2 option(s)

Question: You are creating an inventory module. This module contains a com.inventory.Queries class that uses a com.acme.DB class. This com.acme.DB class is contained in acme.db module. Which of the following files correctly defines the inventory module?

Select 1 option(s)

Question: What will the following code snippet print?

Stream strm1 = Stream.of(2, 3, 5, 7, 11, 13);
double av = strm1
.filter(x->{ if(x>10)return true; else return false;}) //1
.peek() //2
.collect(Collectors.averagingInt(y->y)); //3
System.out.println(av);

Select 1 option(s)

Question: Given:

public class FastDataProcessor{
public static int[] key = {1, 2, 3, 4, 5};

public native byte[] transform(byte[] input, int start, int end);

}

Identify correct statements from secure coding guidelines perspective about the above code?

Select 1 option(s)

Question: You are given two modules named enthu.training and enthu.course packaged in training.jar and course.jar. The training module depends on the course module. You want to run a class named com.enthu.training.StartGUI contained in enthu.training module.

Which of the following commands can be used?

Select 1 option(s)

Question: Given:

public class PlaceHolder {
private K k;
private V v;
public PlaceHolder(K k, V v){
this.k = k;
this.v = v;
}
public K getK() { return k; }
public static PlaceHolder getDuplicateHolder(X x){
return new PlaceHolder(x, x);
}
public static void main(String[] args) {
PlaceHolder ph1 = PlaceHolder.getDuplicateHolder("b"); //1
PlaceHolder ph2 = PlaceHolder.getDuplicateHolder("b"); //2
PlaceHolder ph3 = PlaceHolder.getDuplicateHolder("b"); //3
PlaceHolder ph4 = new PlaceHolder("a", "b"); //4
PlaceHolder ph5 = new PlaceHolder(10, 10); //5

}
}

Which lines will fail compilation?

Select 3 option(s)

Question: What will the following code print when run?

import java.util.function.Predicate;
class Employee{
int age; //1
}

public class TestClass{

public static boolean validateEmployee(Employee e, Predicate p){
return p.test(e);
}

public static void main(String[] args) {
Employee e = new Employee(); //2
System.out.println(validateEmployee(e, e->e.age<10000)); //3
}
}

Select 1 option(s)

Question: Consider the following class:

class Test{
public static void main(String[] args){
for (var i = 0; i < 10; i++) System.out.print(i + " "); //1
for (var i = 10; i > 0; i--) System.out.print(i + " "); //2
var i = 20; //3
System.out.print(i + " "); //4
}
}

Which of the following statements are true?

Select 4 option(s)

Question: Given the following code, which statements can be placed at the indicated position without causing compile and run time errors?

public class Test{
int i1;
static int i2;
public void method1(){
int i;
// ... insert statements here
}
}

Select 3 option(s)

Question: Which of the following is/are valid instantiations and initializations of a multi dimensional array?

Select 2 option(s)

Question: What will be the contents of s1 and s2 at the time of the println statement in the main method of the following program?

import java.util.*;
public class TestClass{
public static void main(String args[]){
Stack s1 = new Stack ();
Stack s2 = new Stack ();
processStacks (s1, s2);
System.out.println (s1 + " "+ s2);
}
public static void processStacks(Stack x1, Stack x2){
x1.push (new Integer ("100")); //assume that the method push adds the passed object to the stack.
x2 = x1;
}
}

Note:[] is used in the options below to denote each element of the Stack.

Select 1 option(s)

Question: What will the following program print?

class Test{
public static void main(String[] args){
var i = 4;
int ia[][][] = new int[i][i = 3][i];
System.out.println( ia.length + ", " + ia[0].length+", "+ ia[0][0].length);
}
}

Select 1 option(s)

Question: What will be the output when the following code is compiled and run?

//in file Test.java
class E1 extends Exception{ }
class E2 extends E1 { }
class Test{
public static void main(String[] args){
try{
throw new E2();
}
catch(E1 e){
System.out.println("E1");
}
catch(Exception e){
System.out.println("E");
}
finally{
System.out.println("Finally");
}
}
}

Select 1 option(s)

Question: Which of the following illustrates a good coding practice given that the database connection is to be reused?

Select 1 option(s)

Question: What will the following code print when run?

public class Noobs {
public void m(int a){
System.out.println("In int ");
}
public void m(char c){
System.out.println("In char ");
}
public static void main(String[] args) {
Noobs n = new Noobs();
int a = 'a';
char c = 6;
n.m(a);
n.m(c);
}
}

Select 1 option(s)

Question: What will the following code print when compiled and run?

var strList1 = new ArrayList();
strList1.add("A");
var strList2 = Collections.unmodifiableList(strList1);
strList1.add(null);
System.out.println(strList1+" "+strList2);
strList2.add(null);
System.out.println(strList1+" "+strList2);

Select 2 option(s)

Question: Given:

Map<String , List> stateCitiesMap = new HashMap<String, List>();

Which of the following options correctly achieves the same or compatible declaration using type inference?

Select 2 option(s)

Question: Given:

class Booby{
}
class Dooby extends Booby{
}
class Tooby extends Dooby{
}

and the following declarations:

var bL = new ArrayList();
var tL = new ArrayList();

List bV = //code for initialization
List dV = //code for initialization

Which of the following statements are valid?

Select 4 option(s)

Question: What will be the result of compiling and running the following code?

class Base{
public Object getValue(){ return new Object(); } //1
}

class Base2 extends Base{
public String getValue(){ return "hello"; } //2
}

public class TestClass{
public static void main(String[] args){
Base b = new Base2();
System.out.println(b.getValue()); //3
}
}

Select 1 option(s)

Question: Which of the following statements will compile without any error?

Select 3 option(s)

Question: Given:

class OverloadingTest{

void m1(int x){
System.out.println("m1 int");
}

void m1(double x){
System.out.println("m1 double");
}

void m1(String x){
System.out.println("m1 String");
}

}

public class TestClass {
public static void main(String[] args) throws Exception {
OverloadingTest ot = new OverloadingTest();
ot.m1(1.0);
}
}

What will be the output?

Select 1 option(s)

Question: Which of the following lines will cause the compilation to fail?

public enum EnumA{ A, AA, AAA}; //1

public class TestClass //2
{
public enum EnumB{ B, BB, BBB }; //3
public static enum EnumC{ C, CC, CCC }; //4
public TestClass()
{
enum EnumD{ D, DD, DDD } //5
}

public void methodX()
{
public enum EnumE{ E, EE, EEE } //6
}

public static void main(String[] args) //7
{
enum EnumF{ F, FF, FFF}; //8
}
}

Select 4 option(s)

Question: What would be the result of compiling and running the following program?

class SomeClass{
public static void main(String args[]){
var size = 10;
var arr = new int[size];
for (var i = 0 ; i < size ; ++i) System.out.println(arr[i]);
}
}

Select 1 option(s)

Question: What will the following code print when compiled and run?

public class OrderTest {

public void initData(String[] arr){
int ind = 0;
for(String str : arr){
str.concat(str+" "+ind);
ind++;
}
}

public void printData(String[] arr){
for(var str : arr){
System.out.println(str);
}
}

public static void main(String[] args) {
var ot = new OrderTest();
String[] arr = new String[2];
ot.initData(arr);
ot.printData(arr);
}
}

Select 1 option(s)

Question: What will the following code print when compiled and run?

class Names{
private List list;
public List getList() {
return list;
}
public void setList(List list) {
this.list = list;
}
public void printNames(){
System.out.println(getList());
}

public static void main(String[] args) {
List list = Arrays.asList(
"Bob Hope",
"Bob Dole",
"Bob Brown"
);

Names n = new Names();
n.setList(list.stream().collect(Collectors.toList()));
n.getList().forEach(Names::printNames);
}

}

Select 1 option(s)

Question: Given:

public static boolean getBool(){
return true;
}
public static String getString(){
return "true";
}
public static void main(String args[]){
switch( getBool() ){
case true :
System.out.println("true");
break;
default :
System.out.println("none");
break;
}
}

What changes can be done so that it will print only true?

Select 1 option(s)

Question: What will the following program print when run?

public class ChangeTest {

private int myValue = 0;

public void showOne(int myValue){
myValue = myValue;
System.out.println(this.myValue);
}

public void showTwo(int myValue){
this.myValue = myValue;
System.out.println(this.myValue);
}
public static void main(String[] args) {
var ct = new ChangeTest();
ct.showOne(100);
ct.showTwo(200);
}
}

Select 1 option(s)

Question: Consider the following classes...

class Car{
public int gearRatio = 8;
public String accelerate() { return "Accelerate : Car"; }
}
class SportsCar extends Car{
public int gearRatio = 9;
public String accelerate() { return "Accelerate : SportsCar"; }
public static void main(String[] args){
Car c = new SportsCar();
System.out.println( c.gearRatio+" "+c.accelerate() );
}
}

What will be printed when SportsCar is run?

Select 1 option(s)

Question: Given:

class MyException extends Exception {
private final int code;
public MyException(int code, Throwable actualEx){
super(actualEx);
this.code = code;
}

public MyException(int code, String message, Throwable actualEx){
super(message, actualEx);//1
this.code = code;
}

public String getMessage(){
return String.format("Exception - Code=%d, Msg=%s, OrigMsg=%s", code, super.getMessage(), this.getCause().getMessage()); //2
}
}

public class TestClass {
public static void main(String[] args) {
try{
throw new MyException(404, "NOT FOUND", new IOException("FILE UNREADABLE")); //3
}catch(Exception e){
System.out.println(e.getMessage());
}
}
}

What is the result?

Select 1 option(s)

Question: Consider the following lines of code:

System.out.println(null + true); //1
System.out.println(true + null); //2
System.out.println(null + null); //3

Which of the following statements are correct?

Select 1 option(s)

Question: Identify correct statements about -classpath and --module-path options while executing a java program.

Select 3 option(s)

Question: Given:

interface Instrument{
default void reset(){
System.out.println("In Instrument");
}
}

class Debt implements Instrument{
}

class Bond extends Debt{
public void reset(){
super.reset();
System.out.println("In Bond");
}
}

class ZCBond extends Bond{
ZCBond(){
reset();
}
public void reset(){
super.reset();
System.out.println("In ZCBond");
}

public static void main(String args[]){
Instrument i = new ZCBond();
}

}

What is the output?

Select 1 option(s)

Question: Assume that a stored procedure named generateDailyGainsReport exists in your database. It takes two parameters - portfolioId and a date and returns a result set with several rows of data.

Consider the following Java code:

try(Connection c = ds.getConnection();
var stmt = c.prepareCall("{call generateDailyGainsReport(?,?)}") ) { //1
stmt.setObject("PORTFOLIOID", portfolioId, JDBCType.VARCHAR); //2
stmt.setObject("VALUEDATE", date, JDBCType.DATE); //3

boolean hasResult = stmt.execute(); //4
if(hasResult){
ResultSet rs = stmt.getResultSet(); //5
//code to process result
}
}

What will happen when the above code is complied and run?

Select 1 option(s)

Question: Consider the following code:

public class Student {
private Map marksObtained = new HashMap();
private ReadWriteLock lock = new ReentrantReadWriteLock();
public void setMarksInSubject(String subject, Integer marks){
// valid code to set marks for a given subject
}
public double getAverageMarks(){

//1 - INSERT CODE HERE

var sum = 0.0;
try{
for(Integer mark : marksObtained.values()){
sum = sum + mark;
}
return sum/marksObtained.size();
}finally{

//2 - INSERT CODE HERE

}
}
}

What should be inserted at //1 and //2?

Select 1 option(s)

Question: Given the following two files in /user/home directory:

In file messages.properties:
message=hi {0}, thanks {1}

In file messages_fr_FR.properties:
message=salut {0}, merci {1}

and the following class in /user/home directory:

public class TestClass
{
public static void main(String[] args) {

//INSERT CODE HERE
System.out.println(message);
}
}

Which of the following options when inserted in TestClass will print salut Amy, merci Adams?

Select 2 option(s)