String

Question 1

It is a sequence of zero or more characters from the Unicode character set.

Answer 1

String

Question 2

It is the sequence consisting of zero characters

Answer 2

Null string

Question 3

What is it called when an object cannot be changed?

Answer 3

Immutable

Question 4

Does a string change once created?

Answer 4

NO

Question 5

If a string does not change once created, what happens instead?

Answer 5

Methods produce new strings from old ones

Question 6

A representation for a string value within the program text

Answer 6

String Literal

Question 7

In Java, it is a sequence of zero or more graphic characters from the Unicode character set or escape sequences, enclosed in double-quotes

Answer 7

String Literal

Question 8

What is the syntax for string declaration?

Answer 8

String varname = value;

Question 9

What does the following String function do?
charAt (int i)

Answer 9

Character at position i

Question 10

What does the following String function do?
compareTo (String t)

Answer 10

Compare with t

Question 11

What does the following String function do?
concat (String t)

Answer 11

Concatenation with t

Question 12

What does the following String function do?
equals (String t)

Answer 12

Same characters as t

Question 13

What does the following String function do?
equalsIgnoreCase

Answer 13

Same characters as t (ignoring case differences)

Question 14

What does the following String function do?
indexOf (char c)

Answer 14

Position of the first occurence of c

Question 15

What does the following String function do?
indexOf (String t)

Answer 15

Position of the first occurence of t

Question 16

What does the following String function do?
length ()

Answer 16

Number of characters in String

Question 17

What does the following String function do?
replace (char c, char d)

Answer 17

Replaces c with d

Question 18

What does the following String function do?
substring (int f int t)

Answer 18

Substring from position f up to but not including t

Question 19

What does the following String function do?
toLowerCase()

Answer 19

Equivalent string in all lowercase

Question 20

What does the following String function do?
toUpperCase()

Answer 20

Equivalent string in all uppercase

Question 21

What does the following String function do?
trim ()

Answer 21

Equivalent string without leading and trailing white space

Question 22

What would the output be?
String str = “programming”;
char ch = str.charAt(2)
System.out.println(“Character at charAt(2): “ + ch);
ch = str.charAt(5)
System.out.println(“Character at charAt(5): “ + ch);

Answer 22

Character at charAt(2): o
Character at charAt(5): a

Question 23

What would the output be?
System.out.println(“Character at charAt(2):” + ch);
String s1 = “Hello”;
String s2 = “Hello;”
String s3 = “HELLO”;
String s4 = “hello”;
System.out.println(“s1.compareTo(s2) “ + s1.compareTo(s2));
System.out.println(“s1.compareTo(s3) “ + s1.compareTo(s3));
System.out.println(“s1.compareTo(s4) “ + s1.compareTo(s4));

Answer 23

s1.compareTo(s2) 0
s1.compareTo(s3)
s1.compareTo(s4) -32

Question 24

What value is returned if the content of the strings are the same when using the compareTo function?

Answer 24

0

Question 25

What value is returned if the first string comes before the second in alphabetical order when using the compareTo function?

Answer 25

A negative value

Question 26

What value is returned if the first string comes after the second in alphabetical order when using the compareTo function?

Answer 26

A positive value

Question 27

**What would the output be?** String s1 = "Hello"; String s2 = "Programming"; String s3 = "Enjoy"; String s4 = " s1.concat(s2); String s5 = "s4.concat(s3); System.out.println("s1.concat(s2)>> " + s4); System.out.println("s4.concat(s3)>> " + s5);

Answer 27

s1.concat(s2)>> HelloProgramming s4.concat(s3)>> HelloProgrammingEnjoy

Question 28

**What would the output be?** String s1 = "Hello"; String s2 = "Hello;" String s3 = "HELLO"; String s4 = "hello"; System.out.println("s1.equals(s2) " + s1.equals(s2)); System.out.println("s1.equals(s3) " + s1.equals(s3)); System.out.println("s1.equals(s4) " + s1.equals(s4));

Answer 28

s1.equals(s2) true s1.equals(s3) false s1.equals(s4) false

Question 29

**What would the output be?** String s1 = "Google classroom"; System.out.println("s1.indexOf('o') " + s1.indexOf('o')); System.out.println("s1.indexOf('c') " + s1.indexOf('c')); System.out.println("s1.indexOf('s') " + s1.indexOf('s')); System.out.println("s1.indexOf('G') " + s1.indexOf('G')); System.out.println("s1.indexOf('g') " + s1.indexOf('g')); System.out.println("s1.indexOf('x') " + s1.indexOf('x'));

Answer 29

s1.indexOf('o') 1 s1.indexOf('c') 7 s1.indexOf('s') 10 s1.indexOf('G') 0 s1.indexOf('g') 3 s1.indexOf('x') -1

Question 30

**What would the output be?** String s1="The quick brown fox and the dog" System.out.println("s1.indexOf("the") "+s1.indexOf("the System.out.println("s1.indexOf("Thel")" + sindexOf("The System.out.println("s1.indexOf("fox\")" + s1.indexOf("fox")); System.out.println("s1.indexOf("Fox\") " + s1.indexOf("Fox")); System.out.println("s1.indexOf(\"cat")" + s1.indexOf("cat"));

Answer 30

s1.indexOf("the") 24 s1.indexOf("The") 0 s1.indexOf("fox") 16 s1.indexOf("Fox") -1 s1.indexOf("cat") -1

Question 31

**What would the output be?** String str1="programming" System.out.println("str1.replace('m', 'g')>>"+str1.replace('m', 'g System.out.println("str1.replace(\"gram\", \"ham\") >> " str1.replace("gram", "ham"));

Answer 31

str1.replace('m', 'g')>> progragging str1.replace("gram", "ham") >> prohamming

Question 32

**What would the output be?** String str1 = "programming"; System.out.println("str1.substring(1, 4): " + str1.substring(1, 4)); System.out.println("str1.substring(2, 7): " + str1.substring(2, 7)); System.out.println("str1.substring(3): " + str1.substring(3));

Answer 32

str1.substring(1, 4): rog str1.substring(2, 7): ogram str1.substring(3): gramming

Question 33

It is when a method breaks a given string around matches of the given regular expression

Answer 33

Split

Question 34

It returns an array of strings computed by splitting the given string

Answer 34

Split

Question 35

Method in String class

Answer 35

Split

Question 36

It returns an array of strings after splitting an input String based on the delimiting regular expression

Answer 36

String[] split(Spring regex)

Question 37

This limits the number of strings returned after split-up

Answer 37

String[] split(String regex, int limit)

Question 38

**What would the values of the array elements be?** String name = "Ana, Maria, Carla, Vina, Glen" String breakName[] = name.split(" ")

Answer 38

breakName[0] = Ana breakName[1] = Maria breakName[2] = Carla breakName [3] = Vina breakName[4] = Glen

Question 39

**Split the following into the month, day, and year.** May 11, 2022

Answer 39

date = "May 11, 2002"; date1 = date.split(","); // date1[0] = May 11, // date1[1] = 2002 date2 = date1[0].split(" "); // date2[0] = May // date2[1] = 11 // date1[1] = 2002

Question 40

String sentences = "Java Programming is fun and easy"; String splitSentence[] = sentence.split(" "); System.out.println("Sentence: " + sentence); System.out.println("After Split"); for (int x = 0; x

Answer 40

splitSentence[0] Java splitSentence[1] Programming splitSentence[2] is splitSentence[3] fun splitSentence[4] and splitSentence[5] easy