Java standard test 8 Code 1Z 829

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

package trywithresources;

import java.io.IOException;

public class Device implements AutoCloseable{
String header = null;
public void open(){
header = "OPENED";
System.out.println("Device Opened");
}
public String read() throws IOException{
throw new IOException("Unknown");
}

public void writeHeader(String str) throws IOException{
System.out.println("Writing : "+str);
header = str;
}
public void close(){
header = null;
System.out.println("Device closed");
}

public static void testDevice(){
try(Device d = new Device()){
d.open();
d.writeHeader("TEST");
d.close();
}catch(IOException e){
System.out.println("Got Exception");
}
}
public static void main(String[] args) {
Device.testDevice();
}

}

Select 1 option(s)

Question: What will be the result of attempting to run the following program?

public class StringArrayTest{
public static void main(String args[]){
String[][][] arr = {
{ { "a", "b" , "c"}, { "d", "e", null } },
{ {"x"}, null },{{"y"}},{ { "z","p"}, {}
}
};
System.out.println(arr[0][1][2]);
}
}

Select 1 option(s)

Question: What will the following code fragment print?

Path p1 = Paths.get("photos/goa");
Path p2 = Paths.get("/index.html");
Path p3 = p1.relativize(p2);
System.out.println(p3);

Select 1 option(s)

Question: Consider the following code:

import java.util.ArrayList;

public class Student{

ArrayList scores;
private double average;

public ArrayList getScores(){ return scores; }

public double getAverage(){ return average; }

private void computeAverage(){
//valid code to compute average
average =//update average value
}

public Student(){
computeAverage();
}

//other code irrelavant to this question not shown

}

What can be done to improve the encapsulation of this class?

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: Given the following code:

interface Movable{
int offset = 100;
public void move(int dx);
}
interface Growable{
public void grow(int dy);
}

class Animal implements Movable, Growable{
public void move(int dx){ }
public void grow(int dy){ }
}

Select 1 option(s)

Question: Given that Book is a valid class with appropriate constructor and getPrice and getTitle methods that returns a double and a String respectively, consider the following code:

List<List> books = Arrays.asList(
Arrays.asList(
new Book("Windmills of the Gods", 7.0),
new Book("Tell me your dreams",9.0) ),
Arrays.asList(
new Book("There is a hippy on the highway", 5.0),
new Book("Easy come easy go", 5.0)) );

double d = books.stream()
INSERT CODE HERE //1
INSERT CODE HERE //2
.sum();
System.out.println(d);

What can be inserted in the above code so that it will print 26.0?

Select 1 option(s)

Question: What will the following code print when run?

import java.io.Reader;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class MarkTest {

public static void main(String[] args) {

try (Reader r = new BufferedReader(new FileReader("c:\\temp\\test.txt"))) {
if (r.markSupported()) {
BufferedReader in = (BufferedReader) r;
System.out.print(in.readLine());
in.mark(100);
System.out.print(in.readLine());
System.out.print(in.readLine());
in.reset();
System.out.print(in.readLine());
in.reset();
System.out.println(in.readLine());
}else{
System.out.println("Mark Not Supported");
}
} catch (IOException e) {
e.printStackTrace();
}
}
}

Assume that the file test.txt contains:
A
B
C
D
E

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;
}

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

Select 1 option(s)

Question: Identify the correct statements regarding the following program?

package trywithresources;

import java.io.IOException;

public class Device implements AutoCloseable{
String header = null;
public Device(String name) throws IOException{
header = name;
if("D2".equals(name)) throw new IOException("Unknown");
System.out.println(header + " Opened");
}

public String read() throws IOException{
return "";
}

public void close(){
System.out.println("Closing device "+header);
throw new RuntimeException("RTE while closing "+header);
}

public static void main(String[] args) throws Exception {
try(Device d1 = new Device("D1");
Device d2 = new Device("D2")){
throw new Exception("test");
}
}

}

Select 1 option(s)

Question: Consider the following class...

public class ParamTest {
public static void printSum(int a, int b){
System.out.println("In int "+(a+b));
}

public static void printSum(Integer a, Integer b){
System.out.println("In Integer "+(a+b));
}

public static void printSum(double a, double b){
System.out.println("In double "+(a+b));
}

public static void main(String[] args) {
printSum(1, 2);
}
}

What will be printed?

Select 1 option(s)

Question: What can be inserted in the following code so that it will print 12?

public class TestClass{
interface Doer{
String doIt(int x, String y);
}
public static void main(String[] args) {

INSERT CODE HERE

System.out.println(d.doIt(2, "12345"));
}
}

Select 2 option(s)

Question: What will be the result of compilation and execution of the following code ?

DoubleStream is = DoubleStream.of(0, 2, 4); //1
double sum = is.filter( i->i%2 != 0 ).sum(); //2
System.out.println(sum); //3

Select 1 option(s)

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

class Game{
public void play() throws Exception{
System.out.println("Playing...");
}
}

public class Soccer extends Game{
public void play(){
System.out.println("Playing Soccer...");
}
public static void main(String[] args){
Game g = new Soccer();
g.play();
}
}

Select 1 option(s)

Question: Identify correct statements about the modular JDK.

Select 3 option(s)

Question: Given the following class definitions, the expression

(obj instanceof A) && ! (obj instanceof C) && ! (obj instanceof D)

correctly identifies whether the object referred to by obj was created by instantiating class B rather than classes A, C and D?

class A {}
class B extends A {}
class C extends B {}
class D extends C {}

Select 1 option(s)

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

import java.util.*;
public class TestClass {
public static void main(String[] args) throws Exception {
List al = new ArrayList(); //1
al.add(111); //2
System.out.println(al.get(al.size())); //3
}
}

Select 1 option(s)

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

class Data {
private int x = 0;
private String y = "Y";
public Data(int k){
this.x = k;
}
public Data(String k){
this.y = k;
}
public void showMe(){
System.out.println(x+y);
}
}
public class TestClass {
public static void main(String[] args) throws Exception {
new Data(10).showMe();
new Data("Z").showMe();
}
}

Select 1 option(s)

Question: Given:

interface Identifier{
int id();
}

sealed class Person
permits Student //LINE A
{
}

record Student(int id,
String subject)

extends Person //LINE B

implements Identifier //LINE C
{
public static final long serialVersionUID = 1L; //LINE D

private String name = "unknown"; //LINE E

String name(){ return "unknown"; } //LINE F

public int id(){ return id; } //LINE G
}

Which lines will cause compilation issues?

Select 3 option(s)

Question: Consider the following program:

public class TestClass{
public static void main(String[] args) { calculate(2); }
public static void calculate(int x){
String val;
switch(x){
case 2:
default:
val = "def";
}
System.out.println(val);
}
}

What will happen if you try to compile and run the program?

Select 2 option(s)

Question: What will the following code print?

String s1 = """
a \
b \t
c \s
""";
System.out.println(s1.length()+" "+s1.split("\\n").length);

Select 1 option(s)

Question: Consider the following code written to generate a report containing customer data where each line is a pipe separated list of values.

String qr = "select EMAILID, NAME, PHONE from CUSTOMER order by EMAILID";
PreparedStatement stmt = connection.prepareStatement(qr);
ResultSet rs = stmt.executeQuery(); //LINE 10
while(rs.next()){
System.out.println(rs.getString(0)+"|"+rs.getString(1)+"|"+rs.getString(3));
}
connection.close();

Identify the correct statement about this code.

(Assume that items not specified such as import statements and try/catch block are all valid.)

Select 1 option(s)

Question: Which of the given statements are correct for a method that overrides the following method:

public Set getSet(int a) {...}

Assume that Set is an interface and HashSet is a class that implements Set.

Select 3 option(s)

Question: What will the following code print when run?

LocalDate d = LocalDate.now();
java.time.format.DateTimeFormatter df = new java.time.format.DateTimeFormat(FormatStyle.LONG);
System.out.println(df.format(d));

Select 1 option(s)

Question: Given:

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

List list = new CopyOnWriteArrayList();
ExecutorService es = Executors.newFixedThreadPool(5);
CyclicBarrier cb = new CyclicBarrier(2, ()->System.out.print("All Done"));

IntStream.range(0, 5).forEach(n->es.execute(
()->{
try{
list.add(n);
cb.await();
}catch(InterruptedException|BrokenBarrierException e){
System.out.println("Exception");
}
}
));
es.shutdown();
}
}

What will the above program print?

Select 2 option(s)

Question: The following class will print 'index = 2' when compiled and run.

class Test{
public static int[ ] getArray() { return null; }
public static void main(String[] args){
var index = 1;
try{
getArray()[index=2]++;
}
catch (Exception e){ } //empty catch
System.out.println("index = " + index);
}
}

Select 1 option(s)

Question: What will the following code print?

Duration d = Duration.ofMillis(1100);
System.out.println(d);
d = Duration.ofSeconds(61);
System.out.println(d);

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 == false){
System.out.println("true");
} else{
System.out.println("false");
}

Select 1 option(s)

Question: Your application was developed and packaged on the Java 8 platform as a jar file. It consists of the following packages:

com.abc.stocks
com.abc.stocks.valuation
com.abc.stocks.analytics
com.abc.bonds
com.abc.bonds.valuation
com.abc.bonds.analytics
com.abc.derivatives
com.abc.derivatives.valuation
com.abc.derivatives.analytics

You are now trying to modularize it into three different modules. Which of the following module descriptions could potentially be valid?

Select 1 option(s)

Question: Given the following exception classes:

class MyException extends Exception{}
class MyException1 extends MyException{}
class MyException2 extends MyException{}
class MyException3 extends MyException2{}

and the following code:

try{
//code that could potentially throw any of the above mentioned exceptions
}
INSERT CODE HERE

Which of the following options can be inserted in the above code?

Select 1 option(s)

Question: Your group has an existing application (reports.jar) that uses a library (analytics.jar) from another group in your company. Both - the application and the library - use a JDBC driver packaged in ojdbc8.jar.

Which of the following options describes the steps that will be required to modularize your application?

Select 1 option(s)

Question: Which of the following lambda expressions can be used to implement a Function ?

Select 1 option(s)

Question: Which functional interface(s) would you use if you need a function that always returns the same type as the type of its input(s)?

Select 2 option(s)

Question: What will be the output of the following program?

public class TestClass{
public static void main(String args[ ] ){
int i = 0 ;
boolean bool1 = true ;
boolean bool2 = false;
boolean bool = false;
bool = ( bool2 & method1(i++) ); //1
bool = ( bool2 && method1(i++) ); //2
bool = ( bool1 | method1(i++) ); //3
bool = ( bool1 || method1(i++) ); //4
System.out.println(i);
}
public static boolean method1(int i){
return i>0 ? true : false;
}
}

Select 1 option(s)

Question: Consider the following code:

class Outsider
{
public class Insider{ }
}
public class TestClass
{
public static void main(String[] args)
{
var os = new Outsider();
// 1 insert line here
}
}

Which of the following options can be inserted at //1?

Select 1 option(s)

Question: Given the following code:

Transaction t1 = new Transaction(1, 2); //1

Transaction t2 = new Transaction(1, "2"); //2

It is required that //1 must compile and //2 must NOT compile. Which of the following declarations of class Transaction will satisfy the requirement?

Select 1 option(s)

Question: Consider the following code appearing in the same file:

class Data {
private int x = 0, y = 0;
public Data(int x, int y){
this.x = x; this.y = y;
}
}
public class TestClass {
public static void main(String[] args) throws Exception {
Data d = new Data(1, 1);
//add code here
}
}
Which of the following options when applied individually will change the Data object currently referred to by the variable d to contain 2, 2 as values for its data fields?

Select 1 option(s)

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

public class TestClass{

public static int operate(IntUnaryOperator iuo){
return iuo.applyAsInt(5);
}

public static void main(String[] args) {

IntFunction fo = a->b->a-b; //1

int x = operate(fo.apply(20)); //2
System.out.println(x);
}
}

Select 1 option(s)

Question: Which of the following interface definitions can use Lambda expressions?

Select 2 option(s)

Question: What will the following code print?

List s1 = new ArrayList();
String s = null;
s1.add("a");
s1.add(s); //1
s1.add("b");
s1.remove(s); //2
System.out.println(s1); //3

Select 1 option(s)

Question: Which of the following four constructs are valid?

1.
switch(5)
{
default :
}

2.
switch(5)
{
default : break;
}

3.
switch(8);

4.
var x = 0;
switch(x){
}

5.
public int switchTest(byte x){
return switch(x){
default -> 0;
case '1' -> 1;
};
}

Select 1 option(s)

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

HashSet keys = new HashSet(List.of("a", "b", "c"));
ArrayList values = new ArrayList(Set.of("1", "2", "3"));

Map m = new HashMap();
int i = 0;
for(var key : keys){
m.put(key, values.get(i++));
}
keys.clear(); //2
values.clear();
System.out.println(m.keySet().size()+" "+m.values().size());

Select 1 option(s)

Question: Consider the following classes:

class A {
public int getCode(){ return 2;}
}

class AA extends A {
public void doStuff() {
}
}
Given the following two declarations, which of the options will compile?
A a = null;
AA aa = null;

Select 4 option(s)

Question: Given:

ArrayList source = new ArrayList();
source.addAll(Arrays.asList(1, 2, 3, 4, 5, 6));

List destination =
Collections.synchronizedList(new ArrayList());

source
.parallelStream() //1
.peek(item->{destination.add(item); }) //2
.forEachOrdered(System.out::print);
System.out.println("");
destination
.stream() //3
.forEach(System.out::print); //4
System.out.println("");

What changes must be made to the above code so that it will consistently print
123456
123456
?

Select 1 option(s)

Question: What will the following code fragment print?

Path p1 = Paths.get("\\personal\\readme.txt");
Path p2 = Paths.get("\\index.html");
Path p3 = p1.relativize(p2);
System.out.println(p3);

Select 1 option(s)

Question: Identify valid statements.

Select 3 option(s)

Question: Consider the following code:

public class FileCopier {
public static void copy(String records1, String records2) {
try (
InputStream is = new FileInputStream(records1);
OutputStream os = new FileOutputStream(records2); ) { //1

if(os == null) os = new FileOutputStream("c:\\default.txt"); //2

byte[] buffer = new byte[1024];
int bytesRead = 0;
while ((bytesRead = is.read(buffer)) != -1) { //3
os.write(buffer, 0, bytesRead);
System.out.println("Read and written bytes " + bytesRead);
}
} catch (IOException e) { //4
e.printStackTrace();
}
}

public static void main(String[] args) {
copy("c:\\temp\\test1.txt", "c:\\temp\\test2.txt");
}
}

Assuming appropriate import statements and the existence of both the files, what will happen when the program is compiled and run?

Select 1 option(s)

Question: What will be the result of attempting to compile and run the following program?

public class TestClass{
public static void main(String args[ ] ){
Object a, b, c ;
a = new String("A");
b = new String("B");
c = a;
a = b;
System.out.println(""+c);
}
}

Select 1 option(s)

Question: Given:

int[][] orig = { { 1, 2, 3} , { 4, 5, 6, 7}};
int[][] dup = orig.clone();
int[] copy = dup[0].clone();

System.out.println(orig == dup);
System.out.println(orig.equals(dup));
System.out.println(orig[0] == dup[0]);
System.out.println(dup[0] == copy);
System.out.println(dup[0].equals(copy));

How many times will true be printed?

Select 1 option(s)

Question: What will the following code print when run?

Deque d = new ArrayDeque();
d.add(1);
d.add(2);
d.addFirst(3);
System.out.println(d.pollLast());
System.out.println(d.pollLast());
System.out.println(d.pollLast());

Select 1 option(s)

Question: What will the following code fragment print?

Path p1 = Paths.get("c:\\personal\\.\\photos\\..\\readme.txt");
Path p2 = p1.normalize();
System.out.println(p2);

Select 1 option(s)

Question: You have an existing java application that contains the following packages -

com.acme.provisioning.client
com.acme.provisioning.service
com.acme.provisioning.dto
com.acme.provisioning.database

The dependency of classes in these packages is as follows -

Classes in the client package use classes from the service and the dto package.
Classes in the service package use classes from the dto and the database package
Classes in the database package use classes from the dto package.
Classes in the dto package do not use classes from any other package.

You want to modularize the application into three modules - client, service, and dto.

Which of the following would be a valid module-info for the service module?

Select 1 option(s)

Question: What will the following program print?

public class TestClass{
public static void main(String[] args){
Object obj1 = new Object();
Object obj2 = obj1;
if( obj1.equals(obj2) ) System.out.println("true");
else System.out.println("false");
}
}

Select 1 option(s)

Question: Given:

public class ValueHolder{
final int value;

*INSERT CODE HERE*

}

Which of the following options can be inserted in the above code independent of each other?

Select 2 option(s)

Question: Consider the following code:

//Assume appropriate imports
class Person{
String name;
String dob;
public Person(String name, String dob){
this.name = name; this.dob = dob;
}
}
public class SortTest {
public static void main(String[] args) {
ArrayList al = new ArrayList();
al.add(new Person("Paul", "01012000"));
al.add(new Person("Peter", "01011990"));
al.add(new Person("Patrick", "01012002"));

//INSERT CODE HERE

for(Person a : al) System.out.println(a.name+" "+ a.dob);
}
}

What can be inserted in the code so that it will sort the collection of Persons by Person's dob attribute?

Select 1 option(s)