Question: Consider the following class:

public class PortConnector{

   public PortConnector(int port) throws IOException{

   ...lot of valid code.

   }

   ...other valid code.

}

You want to write another class CleanConnector that extends from PortConnector. Which of the following statements should hold true for CleanConnector class?

Select 1 option(s)

Question: Consider the following code:

import java.io.*;

public class Test

{

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

   {

      var fw = new FileWriter("text.txt");

      // fw.write("hello"); //1

      fw.close();

   }

}

Which of the following statements are correct?

Select 1 option(s)

Questino: What will the following code print?

Map map1 = new HashMap();

map1.put("a", 1);

map1.put("b", 1);

map1.merge("b", 1, (i1, i2)->i1+i2);

map1.merge("c", 3, (i1, i2)->i1+i2);

System.out.println(map1);

Select 1 option(s)

Question: What will the following code print?

        String examName = "OCP Java 11";

        String uniqueExamName = new String(examName);

        String internedExamName = uniqueExamName.intern();

        System.out.println(

                (examName==uniqueExamName)+" "+

                (examName == internedExamName)+" "+

                (uniqueExamName == internedExamName) );

Select 1 option(s)

Question: How will you initialize a DateTimeFormatter object so that the following code will print the number of the month (i.e. 02 for Feb, 12 for Dec, and so on) and a two digit calendar year of any given date?

    System.out.println(dtf.format(LocalDate.now()));

Select 1 option(s)

Question: Given the following contents of module-info.java.

module enthu.finance{

  exports com.enthu.Reports to com.enthu.tax;

  requires transitive enthu.utils;

}

Select correct statements.

Select 1 option(s)

Question: Which of the following are benefits of ArrayList over an array?

Select 1 option(s)

Question: Identify correct statements about Java platform module system.

Select 2 option(s)

Question: Consider the following code snippet:

XXXX m ;

//other code that initializes m

  switch( m ){

     case 32  : System.out.println("32");   break;

     case 64  : System.out.println("64");   break;

     case 128 : System.out.println("128");  break;

  }

What type can 'm' be of so that the above code compiles and runs as expected ?

Answered Incorrectly

Select 3 option(s)

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

module com.amazing.movies{ //1

   exports com.amazing.movies; //2

   exports com.amazing.movies to com.amazing.rentals;//3

   requires transitive com.amazing.customer;//4

}

Identify correct statements.

Select 1 option(s)

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

interface T1{

}

interface T2{

   int VALUE = 10;

   void m1();

}

interface T3 extends T1, T2{

   public void m1();

   public void m1(int x);

}

Select 1 option(s)

Question: Your application is packaged in myapp.jar and depends on a jar named datalayer.jar, which in turn depends on mysql-connector-java-8.0.11.jar. The following packages exist in these jars:

myapp.jar:   com.abc.myapp

datalayer.jar: com.abc.datalayer

mysql-connector-java-8.0.11.jar:  com.mysql.jdbc

You want to use bottom up approach for migrating your app to a modular app. Which of the following is required before you can do this?

Select 1 option(s)

Question: Which of the following statements are correct regarding the module system of Java.

Select 2 option(s)

Question: Given:

public class FunWithArgs {

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

        System.out.println(args[0][1]);

    }

    public static void main(String[] args) {

        var fwa = new FunWithArgs();

        String[][] newargs = {args};

        fwa.main(newargs);

    }

}

The above program is compiled with the command line:

javac FunWithArgs.java

and then run with:

java FunWithArgs a b c

What will be the output?

Select 1 option(s)

Question: Identify correct statements.

Select 3 option(s)

Question: Identify correct statements about the modular JDK.

Select 3 option(s)

Question: Identify correct statement(s) regarding the benefit of using PreparedStatement over Statement.

Select 2 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 print?

void crazyLoop(){

   var c = 0;

   JACK: while (c < 8){

       JILL: System.out.println(c);

       if (c > 3) break JILL; else c++;

   }

}

Select 1 option(s)

Question: Given:

  Connection con = DriverManager.getConnection(dbURL);

  String updateString =

        "update SALES " +

        "set T_AMOUNT = 100 where T_NAME = 'BOB'";

  Statement stmt = con.createStatement();

  stmt.executeUpdate(updateString);

  //INSERT CODE HERE

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

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: Identify correct statements about the following method that is used internally by a class:

private byte[] allocateNew(int additional, byte[] existing){

        byte[] newarray = new byte[existing.length+additional];

        System.arraycopy(existing, 0, newarray, 0, existing.length);

        return newarray;

}

Select 2 option(s)

Question: While working on a code cleanup project for a library that you make available to your users, you observe the following customer visible method:

public void setApprovedUsers(final List userids) {

                return AccessController.doPrivileged(

                    (PrivilegedAction)() -> {

                         this.userManager.setApprovedUsers(userids);

                         return null;

                    }

                );

       }

}

What change should you make to this method so that it satisfies the requirements for a customer visible method?

Select 1 option(s)

Question: Which statement(s) about the following code are correct?

interface House{

  public default void lockTheGates(){

     System.out.println("Locking House");

  }

}

interface Office {

  public void lockTheGates();

}

class HomeOffice implements House, Office{ //1

}

public class TestClass {

  public static void main(String[] args) {

    Office off = new HomeOffice();  //2

    off.lockTheGates(); //3

    House home = (House) off; //4

    home.lockTheGates(); //5

  }

}

Select 1 option(s)

Question: Consider the following interface definition:

interface Bozo{

         int type = 0;

         public void jump();

}

Now consider the following class:

public class Type1Bozo implements Bozo{

         public Type1Bozo(){

            type = 1;

         }

         public void jump(){

            System.out.println("jumping..."+type);

         }

         public static void main(String[] args){

            Bozo b = new Type1Bozo();

            b.jump();

         }

}

What will the program print when compiled and run?

Select 1 option(s)

Question: Assuming that the file module-info.java exists in c:\\temp\\src\\foo.bar but not in c:\\temp\\out\\foo.bar and the folder foo.bar exists in c:\\temp\\out, what will happen when the following code is run?

Path p1 = Paths.get("c:\\temp\\src\\foo.bar\\module-info.java");
Path p2 = Paths.get("c:\\temp\\out\\foo.bar");
Files.move(p1, p2);

Select 1 option(s)

Question: Assume that a method named 'method1' contains code which may raise a non-runtime (checked) Exception.

What is/are the possible way(s) to declare this method so that it indicates that it expects the caller to handle that exception?

Select 2 option(s)

Question: Consider the following code:

class A {
public void doA(int k) throws Exception { // 0
for(int i=0; i< 10; i++) {
if(i == k)
throw new Exception("Index of k is "+i); // 1
}
}
public void doB(boolean f) { // 2
if(f) {
doA(15); // 3
}
else return;
}
public static void main(String[] args) { // 4
A a = new A();
a.doB(args.length>0); // 5
}
}

Which of the following statements are correct?

Select 1 option(s)

Question: Given the following interface:

interface InputStreamHandler {
public long read(InputStream in) throws IOException;
}

and the following code in some other class:

public long getTotal(String file) throws IOException{
long sum = readFileBuffered(file,
(InputStream in) -> {
long current = 0;
for (;;) {
int b = in.read();
if (b == -1) {
return current;
}
current += b;
}
});
return sum;
}

public long readFileBuffered(String file, InputStreamHandler handler)
throws IOException {
try (final InputStream in = Files.newInputStream(Paths.get(file))) {
return handler.read(new BufferedInputStream(in));
}
}

Identify correct statements.

Select 1 option(s)

Question: Identify valid statements.

Select 3 option(s)

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

void test(int x){
switch(x){
case 1:
case 2:
case 0:
default :
case 4:
case 'a'|'b': System.out.println('c');
}
}

Select 1 option(s)

Question: You are the maintainer of a library packaged as bondanalytics.jar, which is used by several groups in your company. It has the following two packages that are used by other applications:

com.abc.bonds
com.abc.bonds.analytics

You want to modularize this jar but some groups have not yet modularized their applications. How will such groups use the modularized jar?

Select 1 option(s)

Question: Given the following code (assume appropriate imports):

public class IOTest {
public static void main(String[] args) {
var myfile = Paths.get("test.txt");
try(var bfr = Files.newBufferedReader(myfile, Charset.forName("US-ASCII") )){
String line = null;
while( (line = bfr.readLine()) != null){
System.out.println(line);
}
}catch(Exception e){
System.out.println(e);
}
}
}

What will be printed when this code is run if test.txt doesn't exist?

Select 1 option(s)

Question: Following is a program to capture words from command line and create two collections. One that keeps only unique words and one that keeps all the words in the order they were entered. What should replace AAA and BBB?

static Collection unique = new AAA();
static Collection ordered = new BBB();
public static void main(String args[]) throws Exception
{
BufferedReader bfr = new BufferedReader( new InputStreamReader( System.in ) );
String s = bfr.readLine();
while(s != null && s.length() >0)
{
unique.add(s);
ordered.add(s);
s = bfr.readLine();
}
System.out.println(unique);
System.out.println(ordered);
}

Select 2 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.addFirst(2);
d.pop();
d.offerFirst(3);

(Assume that in the output, front of deque is on the left side and the end is on the right side.)

Select 1 option(s)

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

import java.util.*;

public class TestClass {

public static void main(String[] args) {

TreeSet s = new TreeSet();
TreeSet subs = new TreeSet();

for(int i = 324; i<=328; i++)
{
s.add(i);
}
subs = (TreeSet) s.subSet(326, true, 328, true );
subs.add(329);
System.out.println(s+" "+subs);

}

}

Select 1 option(s)

Question: Consider the following code:

public class Logger{
private StringBuilder sb = new StringBuilder();

public void logMsg(String location, String message){
sb.append(location);
sb.append("-");
sb.append(message);
}

public void dumpLog(){
System.out.println(sb.toString());
//Empty the contents of sb here
}

}

Which of the following options will empty the contents of the StringBuilder referred to by variable sb in method dumpLog()?

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: What will the following code print?

Stream ss = Stream.of("a", "b", "c");
String str = ss.collect(Collectors.joining(",", "-", "+"));
System.out.println(str);

Select 1 option(s)

Question: Identify correct statements about the modular JDK.

Select 3 option(s)

Question: What can be done to get the following code to compile and run? (Assume that the options are independent of each other.)

public float parseFloat( String s ){
float f = 0.0f; // 1
try{
f = Float.valueOf( s ).floatValue(); // 2
return f ; // 3
}
catch(NumberFormatException nfe){
f = Float.NaN ; // 4
return f; // 5
}
finally {
return f; // 6
}
return f ; // 7
}

Select 4 option(s)

Question: As a part of an application, you have serialized and stored some objects of a class in the database. At another place in the same application, you deserialize those objects.

After a few months you determine that you need to add one new String field in the class.

Which of the following statements are correct regarding the above described situation?

Select 1 option(s)

Question: Consider the following method code:

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

byte[] buffer = new byte[1024];
int bytesRead = 0;
while ((bytesRead = is.read(buffer)) != -1) {
os.write(buffer, 0, bytesRead);
System.out.println("Read and written bytes " + bytesRead);
}
}
catch ( *INSERT CODE HERE* e ) { //LINE 100
}

}

What can be inserted at //LINE 100 to make the method compile?

Select 1 option(s)

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

public class PromotionTest{
public static void main(String args[]){
int i = 5;
float f = 5.5f;
double d = 3.8;
char c = 'a';
if (i == f) c++;
if (((int) (f + d)) == ((int) f + (int) d)) c += 2;
System.out.println(c);
}
}

Select 1 option(s)

Question: Given the following complete contents of TestClass.java:

import java.util.ArrayList;
import java.util.Collections;

class Address implements Comparable

{
String street;
String zip;
public Address(String street, String zip){
this.street = street; this.zip = zip;
}
public int compareTo(Address o) {
int x = this.zip.compareTo(o.zip);
return x == 0? this.street.compareTo(o.street) : x;
}
}
public class TestClass {
public static void main(String[] args) {
ArrayList

al = new ArrayList();
al.add(new Address("dupont dr", "28217"));
al.add(new Address("sharview cir", "28217"));
al.add(new Address("yorkmont ridge ln", "11223"));
Collections.sort(al);
for(Address a : al) System.out.println(a.street+" "+ a.zip);
}
}

What will be printed?

Select 1 option(s)

Question: Given:

interface I { }

class A implements I{
public String toString(){ return "in a"; }
}

class B extends A{
public String toString(){ return "in b"; }
}


public class TestClass {

public static void main(String[] args) {
B b = new B();
A a = b;
I i = a;

System.out.println(i);
System.out.println((B)a);
System.out.println(b);

}
}

What will be printed when the above code is compiled and run?

Select 1 option(s)

Question: Consider the following code.

LocalDate d = LocalDate.now();
Locale loc = new Locale("fr", "FR");
// 1 insert code here.

What should be inserted at //1 above so that it will print the date in French format?

Select 1 option(s)

Question: Which of the following statements will correctly create and initialize an array of Strings to non null elements?

Select 4 option(s)

Question: Which of the following are valid JDBC URLs?

Select 1 option(s)

Question: Consider the following code:

Locale.setDefault(new Locale("es", "ES"));
ResourceBundle rb = ResourceBundle.getBundle("appmessages");
String msg = rb.getString("greetings");
System.out.println(msg);

You have created a valid resource bundle file named appmessages_es_ES.properties that contains 'greetings' property. However, when you run the above code, you get an exception saying,
"java.util.MissingResourceException:
Can't find bundle for base name appmessages, locale es_ES".

What could be the reason?

Select 1 option(s)