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- 1. Multiple Choice
Is String a primitive data type?
Yes
No
Both
- 2. Multiple Choice
Which method to use to find length of a string?
length()
size()
long()
count()
- 3. Multiple Choice
Which data type gets returned from length() method in String class?
double
String
int
number
- 4. Multiple Choice
String txt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
What is the correct way to find the length of "txt" string?
int len = length(txt);
float len = txt.length();
int len = txt.length();
double len = length(txt);
- 5. Multiple Choice
Which is correct method to convert String into uppercase
changeUpperCase()
convertUpperCase()
toUpper()
toUpperCase()
- 6. Multiple Choice
String txt = "Hello World";
System.out.println(txt.toUpperCase());
Choose the correct output.
"HELLO WORLD"
HELLO WORLD
Hello world
Hello World
- 7. Multiple Choice
Choose correct purpose of indexOf() in String class.
returns the index (the position) of the last occurrence of a specified text in a string
returns the character of the first occurrence of a specified character in a string
returns the index (the position) of the first occurrence of a specified text in a string (excluding whitespace)
returns the index (the position) of the first occurrence of a specified text in a string (including whitespace)
- 8. Multiple Choice
String x = "10";
String y = "20";
String z = x + y;
System.out.println(z);
Guess the output.
1020
10 20
30
"10 20"
- 9. Multiple Choice
Choose most appropriate purpose of trim() method in String?
to remove white spaces
to get a substring of the string
to cut String at desired index
to remove extra white spaces from start and end of String
- 10. Multiple Choice
What is the most appropriate way to check if two Strings are identical?
string1 == string2
string1.equals(string2)
string1.same(string2)
string1.equalsIgnorecase(string2)
- 11. Multiple Choice
(Multiple answer question)
Pick all NON-primitive datatypes from below :
String
int
primitive
Array
- 12. Multiple Choice
int[] myArray = {11, 22, 33, 44, 55};
which code is correct to print length of above int-array?
System.out.println(int[].myArray.length());
System.out.println(myArray.length);
System.out.println(myArray.length());
System.out.println(int[].myArray.size());
- 13. Multiple Choice
String[] friends = {"John", "Mike", "Samantha", "Monica"};
which code is correct to print "Samantha" using array functionality?
System.out.println(friends[2]);
System.out.println(friends[3]);
System.out.println(friends["Samantha"]);
System.out.println(friends{2});
- 14. Multiple Choice
String[] friends = {"John", "Mike", "Samantha", "Monica"};
which code is correct to print "Samantha" using array functionality?
System.out.println(friends[2]);
System.out.println(friends[3]);
System.out.println(friends["Samantha"]);
System.out.println(friends{2});
- 15. Multiple Choice
Select correct code to create an array of "double" datatype of length 5.
double arr = double[5];
double{} arr = new double{5};
double[5] arr = new double[];
double[] arr = new double[5];
- 16. Multiple Choice
What is the correct relation between length and last-index of array?
last-index is always 1 more than the length
last-index is 1 less than the length (but not always)
last-index is always 1 less than the length
last-index is always equal to the length
- 17. Multiple Choice
Java code to create a non-element array of student marks with the size of 20.
double mark;
double [20] mark = new double;
double [ ] mark = new mark [20];
double [ ] mark = new double [20];
- 18. Multiple Choice
Java code to create a non-element array of student name with size 15.
String [ ] name = new String;
String [ ] name = new String [15];
name = new String [15];
String [15] name = new String [ ];
- 19. Multiple Choice
Java code to create an array of student id with element 115331, 450055, 555641, 875560 and 987555.
int [ ] id = new {115331, 450055, 555641, 875560, 987555};
int [5] id = {115331, 450055, 555641, 875560, 987555};
int [ ] id = {115331, 450055, 555641, 875560, 987555};
int [ ] id = new int [5];
- 20. Multiple Choice
Java code to display the size of an array name studentname[ ].
System.out.println("The size is " + studentname[ index ]);
System.out.println("The size is " + studentname.length);
System.out.println("The size is " + length.length);
System.out.println("The size is " + studentname);
- 21. Multiple Choice
Java code to read elements into array studentname[ ].
- 22. Multiple Choice
Based on the code segment below:- identify the name of the array.
for(int j=0; j<balance.length; j++)
{
System.out.print("Enter amount: ");
.......
}
No answer.
temp[ ]
balance
balance [ i ]
- 23. Multiple Choice
Based on the code segment below:- identify the name of the array.
for(int j=0; j<balance.length; j++)
{
System.out.print("Enter amount: ");
.......
}
No answer.
temp[ ]
balance
balance [ i ]
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