Java standard test 3 Code 1Z 829

Question: Consider the standard 'put' method of class HashMap.

public Object put(Object key, Object value);

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: Which of the following method would you use to get a JDBC connection while using JDBC 4.0 but not while using a previous version of JDBC?

Select 2 option(s)

Question: What will the following code print?

Path p1 = Paths.get("c:\\temp\\test.txt");
Path p2 = Paths.get("report.pdf");
System.out.println(p1.resolve(p2));

Select 1 option(s)

Question: Given:

class Base{
public Map getMap(T t, Z z)
{
return new HashMap();
}
}

class Derived extends Base{

/* public TreeMap getMap(T t, Z z) {
return new TreeMap();
}; */ //1

/* public Map getMap(Number t, Number z) {
return new TreeMap();
}; */ //2

/* public Map getMap(Number t, Number z) {
return new HashMap();
};*/ //3

}

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

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Question: Which of the following statements are valid?

Select 3 option(s)

Question: Given that a table named STOCK exists with nullable columns as follows:

What can be inserted in the above code so that a row with values (1, "APPL", null, null) will be inserted in the STOCK table?

Select 1 option(s)

Question: What two changes can you do, independent of each other, to make the following code compile:

//assume appropriate imports
class PortConnector {

public PortConnector(int port) {
//assume that random() returns a random value
//between 0.0 (inclusive) and 1.0 (exclusive)

if (Math.random() > 0.5) {
throw new IOException();
}

throw new RuntimeException();
}
}


public class TestClass {

public static void main(String[] args) {
try {
PortConnector pc = new PortConnector(10);
} catch (RuntimeException re) {
re.printStackTrace();
}
}
}

Select 2 option(s)

Question: Consider the following code:

class Test{
public static void main(String[] args){
for (int i = 0; i < args.length; i++)
System.out.print(i == 0 ? args[i] : " " + args[i]);
}
}

What will be the output when it is run using the following command:

java Test good bye friend!

Select 1 option(s)

Question: Consider the following class...

class TestClass{
int i;
public TestClass(int i) { this.i = i; }
public String toString(){
if(i == 0) return null;
else return ""+i;
}
public static void main(String[ ] args){
TestClass t1 = new TestClass(0);
TestClass t2 = new TestClass(2);
System.out.println(t2);
System.out.println(""+t1);
}
}

What will be the output when the above program is run?

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Question: What will the following program print?

class Test{
public static void main(String args[]){
var k = 9;
var s = 5;
switch(k){
default :
if( k == 10) { s = s*2; }
else{
s = s+4;
break;
}
case 7 : s = s+3;
}
System.out.println(s);
}
}

Select 1 option(s)

Question: What, if anything, is wrong with the following code?

//Filename: TestClass.java
class TestClass implements T1, T2{
public void m1(){}
}
interface T1{
int VALUE = 1;
void m1();
}
interface T2{
int VALUE = 2;
void m1();
}

Select 1 option(s)

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(){
Device d = new Device();
try(d){
d.open();
d.read();
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 the following code print?

List vowels = new ArrayList();
vowels.add("a");
vowels.add("e");
vowels.add("i");
vowels.add("o");
vowels.add("u");
Function<List, List> f = list->list.subList(2, 4);
f.apply(vowels);
vowels.forEach(System.out::print);

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Question: Which of the following statements are true regarding the try-with-resources statement?

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Question: What will the following code print?

List names = Arrays.asList("Peter", "Paul", "Pascal");
Optional ops = names.stream()
.parallel()
.allMatch(name->name!=null)
.filter(name->name.length()>6)
.findAny();
System.out.println(ops);

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:

import java.io.FileNotFoundException;
import java.io.IOException;

public class Scrap {
public static void main(String[] args) {
try{
if(args.length == 0) m2(); else m3();
}

INSERT CODE HERE

}

public static void m2() throws IOException {
throw new FileNotFoundException(); }

public static void m3() throws IndexOutOfBoundsException{
throw new IndexOutOfBoundsException(); }
}

Assuming that the above code is always invoked with at least one argument, what can be inserted in the above code to make it compile?

Select 2 option(s)

Question: Which line, if any, will give a compile time error?

void test(byte x){
switch(x){
case 'a': // 1
case 256: // 2
case 0: // 3
default : // 4
case 80: // 5
}
}

Select 1 option(s)

Question: Which of the following expressions will evaluate to true if preceded by the following code?

String a = "java";
char[] b = { 'j', 'a', 'v', 'a' };
String c = new String(b);
String d = a;

Select 3 option(s)

Question: Given:

Connection con = DriverManager.getConnection(dbURL);
con.setAutoCommit(false);
String updateString =
"update SALES " +
"set T_AMOUNT = 100 where T_NAME = 'BOB'";
Statement stmt = con.createStatement();
stmt.executeUpdate(updateString);
//INSERT CODE HERE

What statement can be added to the above code so that the update is committed to the database?

Select 1 option(s)

Question: What will the following code print when run?

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

Select 1 option(s)

Question: Complete the following code by filling the two blanks -

class XXX{
public void m() throws Exception{
throw new Exception();
}
}
class YYY extends XXX{
public void m(){ }

public static void main(String[] args) {
________ obj = new ______();
obj.m();
}
}

Select 1 option(s)

Question: Given:

public class Switcher{

public static void main(String[] args){
switch(Integer.parseInt(args[1])) //1
{
case 0 :
var b = false; //2
break;

case 1 :
b = true; // 3
break;
}

if(b) System.out.println(args[2]); //4
}
}

What will the above program print if compiled and run using the following command line:
java Switcher 1 2 3

Select 1 option(s)

Question: Identify the correct statements about the following code -

IntStream is1 = IntStream.of(1, 3, 5); //1
OptionalDouble x = is1.filter(i->i%2 == 0).average(); //2
System.out.println(x); //3

IntStream is2 = IntStream.of(2, 4, 6); //4
int y = is2.filter( i->i%2 != 0 ).sum(); //5
System.out.println(y); //6

Select 1 option(s)

Question: Which of the following code fragments are valid method declarations?

Select 1 option(s)

Question: Given:

String sentence =
"Life is a box of chocolates, Forrest. You never know what you're gonna get."; //1

Optional theword =
Stream.of(sentence.split("[ ,.]")).anyMatch(w->w.startsWith("g")); //2

System.out.println(theword.get()); //3

Which of the following statements are correct?

Select 1 option(s)

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

import java.util.*;

interface Birdie {
void fly();
}

class Dino implements Birdie {
public void fly(){ System.out.println("Dino flies"); }
public void eat(){ System.out.println("Dino eats");}
}

class Bino extends Dino {
public void fly(){ System.out.println("Bino flies"); }
public void eat(){ System.out.println("Bino eats");}

}

public class TestClass {
public static void main(String[] args) {
List m = new ArrayList();
m.add(new Dino());
m.add(new Bino());
for(Birdie b : m) {
b.fly();
b.eat();
}
}
}

Select 1 option(s)

Question: What will the following code print?

Path p1 = Paths.get("c:\\temp\\test.txt");
Path p2 = Paths.get("c:\\temp\\report.pdf");
System.out.println(p1.resolve(p2));

Select 1 option(s)

Question: What will the following code print?

AtomicInteger ai = new AtomicInteger();
Stream stream = Stream.of(11, 11, 22, 33).parallel();
stream.filter( e->{
ai.incrementAndGet();
return e%2==0;
});
System.out.println(ai);

Select 1 option(s)

Question: Consider the following classes...

class Teacher{
void teach(String student){
/* lots of code */
}
}
class Prof extends Teacher{
//1
}

Which of the following methods can be inserted at line //1 ?

Select 4 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: Given the following program, which statements are true?

// Filename: TestClass.java
public class TestClass{
public static void main(String args[]){
A[] a, a1;
B[] b;
a = new A[10]; a1 = a;
b = new B[20];
a = b; // 1
b = (B[]) a; // 2
b = (B[]) a1; // 3
}
}
class A { }
class B extends A { }

Select 2 option(s)

Question: Which of these are valid expressions to create a string of value "hello world" ?

Select 3 option(s)

Question: What will the following program print?

public class InitTest{
public InitTest(){
s1 = sM1("1");
}
static String s1 = sM1("a");
String s3 = sM1("2");{
s1 = sM1("3");
}
static{
s1 = sM1("b");
}
static String s2 = sM1("c");
String s4 = sM1("4");
public static void main(String args[]){
InitTest it = new InitTest();
}
private static String sM1(String s){
System.out.println(s); return s;
}
}

Select 1 option(s)

Question: Consider the following method...

public static void ifTest(boolean flag){
if (flag) //1
if (flag) //2
if (flag) //3
System.out.println("False True");
else //4
System.out.println("True False");
else //5
System.out.println("True True");
else //6
System.out.println("False False");
}

Which of the following statements are correct ?

Select 2 option(s)

Question: What will the following code print?

public class TestClass{
int x = 5;
int getX(){ return x; }

public static void main(String args[]) throws Exception{
TestClass tc = new TestClass();
tc.looper();
System.out.println(tc.x);
}

public void looper(){
var x = 0;
while( (x = getX()) != 0 ){
for(int m = 10; m>=0; m--){
x = m;
}
}

}
}

Select 1 option(s)

Question: What can be inserted in the code below so that it will print UP UP UP?

public class Speak {
public static void main(String[] args) {
Speak s = new GoodSpeak();

INSERT CODE HERE

}
}
class GoodSpeak extends Speak implements Tone{
public void up(){
System.out.println("UP UP UP");
}
}
interface Tone{
void up();
}

Select 2 option(s)

Question: Given the following code:

interface Readable{ }

non-sealed class Device implements Readable { }

sealed class DocType implements Readable permits Book, Journal { }

final non-sealed class Book extends DocType{ }

final class Journal extends DocType{ }

Which types will fail compilation?

Select 2 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[]){
int x = 0;
labelA: for (var i=10; i<0; i--){
var j = 0;
labelB:
while (j < 10){
if (j > i) break labelB;
if (i == j){
x++;
continue labelA;
}
j++;
}
x--;
}
System.out.println(x);
}
}

Select 1 option(s)

Question: Which of the following statements are true?

Select 1 option(s)

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

boolean b1 = false;
int i1 = 2;
int i2 = 3;
if (b1 = i1 == i2){
System.out.println("true");
} else{
System.out.println("false");
}

Select 1 option(s)

Question: Although jmod is not on the part exam you might still see it mentioned in one of the incorrect options. You may read about jmod if you have time.

Which of the following options are supported by jmod?

Select 4 option(s)

Question: Given:

List ls = Arrays.asList(3,4,6,9,2,5,7);
System.out.println(ls.stream().reduce(Integer.MIN_VALUE, (a, b)->a>b?a:b)); //1
System.out.println(ls.stream().max(Integer::max).get()); //2
System.out.println(ls.stream().max(Integer::compare).get()); //3
System.out.println(ls.stream().max((a, b)->a>b?a:b)); //4

Which of the above statements will print 9?

Select 1 option(s)

Question: Consider the following code:

interface Flyer{ String getName(); }

class Bird implements Flyer{
public String name;
public Bird(String name){
this.name = name;
}
public String getName(){ return name; }
}

class Eagle extends Bird {
public Eagle(String name){
super(name);
}
}

public class TestClass {
public static void main(String[] args) throws Exception {
Flyer f = new Eagle("American Bald Eagle");
//PRINT NAME HERE
}
}

Which of the following lines of code will print the name of the Eagle object?

Select 3 option(s)

Question: Given:

interface Book{
public default String getId(){
return "ISBN123456";
}
}

interface Encyclopedia extends Book{
//INSERT CODE HERE
}

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

Select 2 option(s)

Question: Given:

package strings;
public class StringFromChar {

public static void main(String[] args) {
String myStr = "good";
char[] myCharArr = {'g', 'o', 'o', 'd' };

String newStr = "";
for(char ch : myCharArr){
newStr = newStr + ch;
}
boolean b1 = newStr == myStr;
boolean b2 = newStr.equals(myStr);

System.out.println(b1+ " " + b2);

}
}

What will it print when compiled and run?

Select 1 option(s)

Question: Which of the following is a valid module-info for a service user module that uses an Order service defined in OrderServiceAPI module and implemented by OrderServiceProvider module?

Select 2 option(s)

Question: Consider the following method:

public void getLocks(Object a, Object b)
{
synchronized(a)
{
synchronized(b)
{
//do something
}
}
}

and the following instantiations:


Object obj1 = new Object();
Object obj2 = new Object();

obj1 and obj2 are accessible to two different threads and the threads are about to call the getLocks() method. Assume the first thread calls the method getLocks(obj1, obj2). Which of the following options avoids a deadlock?

Select 1 option(s)

Question: Given that java.lang.String has two overloaded toUpperCase methods - toUpperCase() and toUpperCase(Locale ), consider the following code:

String name = "bob";
String val = null;
//Insert code here
System.out.print(val);

Which of the following code fragments can be inserted in the above code so that it will print BOB?

Select 2 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: Given the following code:

sealed interface Cacheable permits Value, Result{
default void clear(){ System.out.println("clearing cache..."); }
}

Which of the following definition will compile without error?

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Question: Consider the following code appearing in a module-info.java

module com.amazing.movies{
requires transitive com.amazing.customer;
}

Identify correct statements.

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Question: Given that daylight Savings Time ends on Nov 6 at 2 AM in US/Eastern time zone. (As a result, 2 AM becomes 1 AM. In other words, one minute after 1.59 AM, the clock shows 1 AM instead of 2 AM.), what will the following code print?

LocalDateTime ld1 = LocalDateTime.of(2022, Month.NOVEMBER, 6, 2, 0);
ZonedDateTime zd1 = ZonedDateTime.of(ld1, ZoneId.of("US/Eastern"));
LocalDateTime ld2 = LocalDateTime.of(2022, Month.NOVEMBER, 6, 1, 0);
ZonedDateTime zd2 = ZonedDateTime.of(ld2, ZoneId.of("US/Eastern"));
long x = ChronoUnit.HOURS.between(zd1, zd2);
System.out.println(x);

Select 1 option(s)

Question: Identify the valid enum declarations.

Select 2 option(s)