Which of the following statement about Set is true?

-Entries are organized as key/value pairs.

-Duplicate entries replace old entries.

-Entries are sorted using a Comparator or the Comparable interface.

Which interface of the java.util package offers the specified behavior?

-Entries are not organized as key/value pairs.

-Duplicate entries are rejected.

Which interface of the java.util package offers the specified behavior?

Which of the following is/are correct statements?

Which of the following statement(s) is/are TRUE?

Which of the following statement(s) is/are FALSE?

Which of the following is/are FALSE about HashMap in java?

List listNames = new ArrayList();

listNames.add("Tom");

listNames.add("Mary");

listNames.add("Peter");

String name2 = (String) listNames.get(1);

System.out.println(name2);

What is the output of the above code

Which of these return type of hasNext() method of an iterator?

 What will be the output of the  Java program?

Which of these interface is not part of Java’s collection framework?

What is Collection in Java?

What is Collection in Java?

Which of these interface is not part of Java’s collection framework?

 What will be the output of the  Java program?

Which of these return type of hasNext() method of an iterator?

Which of these exceptions is thrown by remover() method?

Which of these methods deletes all the elements from invoking collection?

Which of these interface declares core method that all collections will have?

Which of these is an incorrect form of using method max() to obtain maximum element?

Which of these methods can convert an object into a List?

Which of these is true about unmodifiableCollection() method?

Which of these is static variable defined in Collections?

What implementation of Iterator can traverse a collection in both directions?

Which is faster and uses less memory?

What will be output of given code

Which interface does java.util.Hashtable implement?

You need to store elements in a collection that guarantees that no duplicates are stored and all elements can be accessed in natural order.

Which interface provides that capability?

You need to store elements in a collection that guarantees that no duplicates are stored and all elements can be accessed in natural order.

Which interface provides that capability?

Which collection class allows you to grow or shrink its size and provides indexed access to its elements, but whose methods are not synchronized?

Which collection class allows you to grow or shrink its size and provides indexed access to its elements, but whose methods are not synchronized?

The default capacity of a Vector is:

The Comparable interface contains which called?

Find the output

public class TreeMapTest {

public static void main(String args[]) {

Map<Integer, String> m = new TreeMap<Integer, String>();

m.put(11, "audi");

m.put(null, null);

m.put(11, "bmw");

m.put(null, "ferrari");

System.out.println(m.size());

System.out.println(m);

}

public class MyClass {

public static void main(String args[]) {

Map<String, String> hashMap = new HashMap<String, String>();

hashMap.put(new String("a"), "audi");

hashMap.put(new String("a"), "ferrari");

System.out.println(hashMap);

}

}

Deque and Queue are derived from

What will be output of given code

Which is best suited to a multi-threaded environment?

TreeMap implements?

Which of these is synchronized?

TreeMap

How can you sort given HashMap on basis of values

What does Collections.sort internally uses when number of elements are less than 7?

What does Collections.sort internally uses when number of elements are greater than 7?

Which of the following statements are true with respect to sets as objects of Hashset?

Which of the following statements are correct in relation to collections in Java?

Which of the following statements are correct with respect to a Map in Java?

Which of the following interfaces are not a part of the Java's Collection Framework?

Which of the following statements are correct with respect to a List in Java?

Which of the following interfaces must contain a unique element?

Which of the following method deletes all the elements from invoking (calling) collections?

-Contains no duplicate elements.

-Can contain at most one Null value.

-Elements are not key-value pairs.

-Accessing an element can be almost as fast as performing a similar operation on an array.

Which of these classes provides the specified features?

Which of the following statement about Set is true?

-Entries are organized as key/value pairs.

-Duplicate entries replace old entries.

-Entries are sorted using a Comparator or the Comparable interface.

Which interface of the java.util package offers the specified behavior?

-Entries are not organized as key/value pairs.

-Duplicate entries are rejected.

Which interface of the java.util package offers the specified behavior?

List listNames = new ArrayList();

listNames.add("Tom");

listNames.add("Mary");

listNames.add("Peter");

String name2 = (String) listNames.get(1);

System.out.println(name2);

What is the output of the above code

What is Collection in Java?

Which of these interface is not part of Java’s collection framework?

 What will be the output of the  Java program?

Which of these return type of hasNext() method of an iterator?

Which of these methods deletes all the elements from invoking collection?

How many columns does a have if it is created as follows

int[][] a = { {2, 4, 6, 8}, {1, 2, 3, 4}};?

What is the index variable for the element at the first row and first column in array

a?

.

Which of the following statements assigns the letter S to the third row and first column of a two-dimensional array named strGrid (assuming row-major order).

How would you get the value 6 out of the following array

int[][] a = { {2, 4, 6, 8}, {1, 2, 3, 4}};?

Given the following code segment, what is the value of sum after this code executes?

int[][] matrix = { {1,1,2,2},{1,2,2,4},{1,2,3,4},{1,4,1,2}};

int sum = 0; int col = matrix[0].length - 2; for (int row = 0; row < 4; row++) { sum = sum + matrix[row][col]; }

What are the contents of mat after the following code segment has been executed?

int [][] mat = new int [4][3]; for (int row = 0; row < mat.length; row++) { for (int col = 0; col < mat[0].length; col++) { if (row < col) mat[row][col] = 1; else if (row == col) mat[row][col] = 2; else mat[row][col] = 3; } }

Given the following code segment, what is the value of sum after this code executes?

int[][] m = { {1,1,1,1},{1,2,3,4},{2,2,2,2},{2,4,6,8}}; int sum = 0; for (int k = 0; k < m.length; k++) { sum = sum + m[m.length-1-k][1]; }

A. 4 B. 6 C. 9 D. 10

What are the contents of arr after the following code has been executed?

int[][] arr = { {3,2,1},{1,2,3}}; int value = 0; for (int row = 1; row < arr.length; row++) { for (int col = 1; col < arr[0].length; col++) { if (arr[row][col] % 2 == 1) { arr[row][col] = arr[row][col] + 1; } if (arr[row][col] % 2 == 0) { arr[row][col] = arr[row][col] * 2; } } }

Analyze the following code:

public class Test {

public static void main(String[] args) {

boolean[][] x = new boolean[3][];

x[0] = new boolean[1]; x[1] = new boolean[2];

x[2] = new boolean[3];

System.out.println("x[2][2] is " + x[2][2]);

}

}

Suppose a method p has the following heading:

public static int[][] p()

What return statement may be used in p()?

Which of the following is FALSE about arrays on Java

Predict the output?

public class Main {

public static void main(String args[]) {

int arr[] = {10, 20, 30, 40, 50};

for(int i=0; i < arr.length; i++)

{

System.out.print(" " + arr[i]);

}

}

}

class Test {

public static void main(String args[]) {

int arr[2];

System.out.println(arr[0]);

System.out.println(arr[1]);

}

}

public class Main {

public static void main(String args[]) {

int arr[][] = new int[4][];

arr[0] = new int[1];

arr[1] = new int[2];

arr[2] = new int[3];

arr[3] = new int[4];

int i, j, k = 0;

for (i = 0; i < 4; i++) {

for (j = 0; j < i + 1; j++) {

arr[i][j] = k;

k++;

}

}

for (i = 0; i < 4; i++) {

for (j = 0; j < i + 1; j++) {

System.out.print(" " + arr[i][j]);

k++;

}

System.out.println();

}

}

}

Which of the following is the correct way of importing an entire package ‘pkg’?

Which of the following is/are advantages of packages?

Which of these is a mechanism for naming and visibility control of a class and its content?

Which of this access specifies can be used for a class so that its members can be accessed by a different class in the same package?

Arrays in Java are dynamically allocated using the . . . . operator.

Which of the following statements correctly declares a two-dimensional integer array?

Which of the following can be operands of arithmetic operators?

What will be the output of the following Java program?

class Output {

public static void main(String args[]) {

int a = 1;

int b = 2;

int c;

int d;

c = ++b;

d = a++;

c++;

b++;

++a;

System.out.println(a + " " + b + " " + c); }

}

Which of these can be returned by the operator &?

What will be the output of the following Java program?

class comma_operator {

public static void main(String args[]) {

int sum = 0;

for (int i = 0, j = 0; i < 5 & j < 5; ++i, j = i + 1)

sum += i;

System.out.println(sum); }

}

Which of these can not be used for a variable name in Java?

What will be the output of the following Java code?

class operators {

public static void main(String args[]) {

int x = 8;

System.out.println(++x * 3 + " " + x); }

}

Which of the following is not an operator in Java?

What will be the output of the following Java program?

class jump_statments {

public static void main(String args[]) {

int x = 2;

int y = 0;

for ( ; y < 10; ++y) {

if (y % x == 0)

continue;

else if (y == 8)

break;

else

System.out.print(y + " "); }

}

}

Which of the following loops will execute the body of loop even when condition controlling the loop is initially false?

What will be the output of the following Java code?

class Relational_operator {

public static void main(String args[]) {

int var1 = 5;

int var2 = 6;

System.out.print(var1 > var2); }

}

Which of these is not a bitwise operator?

What is the output of relational operators?

int len = "jump it!".length();

What is the value of len?

int x = "quarantine".indexOf("a");

What is the value of x?

String s = "whatever".substring(1,4);

What is the value of s?

String s1 = "hello";

String s2 = new String("hello");

if (s1 == s2) System.out.print("Hey");

else System.out.print("Yo");

What is the output?

int p = "Go Paw Patrol!".indexOf("p");

What is the value of p?

String s = "cool cat".substring(6);

What is the value of s?

String s1 = "goat";

String s2 = s1.substring(0,s1.length());

boolean z = s1.equals(s2);

What is the value of z?

String s = "good job".substring(3, 9);

What is the value of s?

Which code segment should go in the blank so that count is equal to the number of times "whoa" occurs in str?

What is the output of the following:

String myWord = "FUN";

String anotherWord = myWord.toLowerCase();

System.out.println(myWord);

What is the output of the following?

String a = "I will pass the exams.";

String b = " I will pass the exams. ";

if (a.equals(b))

System.out.println("fail");

else

System.out.println(b.substring(9,12));

What is the output of the following?

String a = "Are you ready kids?";

String b = "Aye! Aye! Captain!";

System.out.println(a.concat(b));

What is the output of the following code?

String a = "19";

String b = "75";

System.out.println(a+" "+b);

What method of class String is used to remove white spaces at the beginning and end of String objects?

What does the following print?

System.out.println( "And yet, it moves!".charAt(0) );

Examine the following fragment:

String world = "World!";

StringBuffer buf = new StringBuffer( "Hello" );

buf.append(' ');

buf.append( world );

How many StringBuffer objects are constructed?

Which phrase best describes a String object after it has been constructed?

After a StringBuffer has been constructed, how many characters may be added to it?

What is the potential number of characters in a StringBuffer called?

What is the current number number of characters in a StringBuffer called?

What is the output of the following code snippet?

public class Demo{

public static void main(String args[]) {

String s = "String is ";

s.concat("Immutable ");

System.out.println(s+"Immutable");

}

}

The result of the following code

public class Demo

{

public static void main(String args[]){

String str1="Welcome"; //Line-1

String str2=new String(str1); //Line-2

if(str1.equals(str2))

System.out.println("Java");

else

System.out.println("Python");

}

}

Identify the result of the following code.

public class Demo{

public static void main(String args[]){

String str = "Student";

System.out.println(str.reverse()); // Line-1

}

}

The output of the following code

public class Demo

{

public static void main(String args[]){

String str = "Java is Life";

//single space between words

StringBuffer sb = new StringBuffer(str);

sb.delete(4,8);

System.out.println(sb);

}

}