Explore topic-wise MCQs in Technical Programming.

This section includes 1671 Mcqs, each offering curated multiple-choice questions to sharpen your Technical Programming knowledge and support exam preparation. Choose a topic below to get started.

1251.

What is the output of this program? class output { public static void main(String args[]) { StringBuffer sb=new StringBuffer("Hello"); sb.replace(1,3,"Java"); System.out.println(sb); } }

A. Hello java
B. Hellojava
C. HJavalo
D. Hjava
Answer» D. Hjava
Discussion
1252.

What is the output of this program? class output { public static void main(String args[]) { StringBuffer c = new StringBuffer("Hello"); System.out.println(c.length()); } }

A. 4
B. 5
C. 6
D. 7
Answer» C. 6
Discussion
1253.

Which of the following are incorrect form of StringBuffer class constructor?

A. StringBuffer()
B. StringBuffer(int size)
C. StringBuffer(String str)
D. StringBuffer(int size , String str)
Answer» E.
Discussion
1254.

Which of these method of class StringBuffer is used to get the length of sequence of characters?

A. length()
B. capacity()
C. Length()
D. Capacity()
Answer» B. capacity()
Discussion
1255.

Which of these method of class StringBuffer is used to reverse sequence of characters?

A. reverse()
B. reverseall()
C. Reverse()
D. reverseAll()
Answer» B. reverseall()
Discussion
1256.

What will s2 contain after following lines of code? StringBuffer s1 = "one"; StringBuffer s2 = s1.append("two")

A. one
B. two
C. onetwo
D. twoone
Answer» D. twoone
Discussion
1257.

Which of these method of class StringBuffer is used to extract a substring from a String object?

A. substring()
B. Substring()
C. SubString()
D. None of the mentioned
Answer» B. Substring()
Discussion
1258.

What is the output of this program? class output { class output { public static void main(String args[]) { char c[]={'A', '1', 'b' ,' ' ,'a' , '0'}; for (int i = 0; i < 5; ++i) { i++; if(Character.isDigit(c[i])) System.out.println(c[i]+" is a digit"); if(Character.isWhitespace(c[i])) System.out.println(c[i]+" is a Whitespace character"); if(Character.isUpperCase(c[i])) System.out.println(c[i]+" is an Upper case Letter"); if(Character.isLowerCase(c[i])) System.out.println(c[i]+" is a lower case Letter"); i++; } } }

A. a is a lower case Letter is White space character
B. b is a lower case Letter is White space character
C. 1 is a digit a is a lower case Letter
D. a is a lower case Letter 0 is a digit
Answer» D. a is a lower case Letter 0 is a digit
Discussion
1259.

What is the output of this program? class output { public static void main(String args[]) { StringBuffer s1 = new StringBuffer("Hello"); StringBuffer s2 = s1.reverse(); System.out.println(s2); } }

A. Hello
B. olleH
C. HelloolleH
D. olleHHello
Answer» C. HelloolleH
Discussion
1260.

What is the output of this program? class output { public static void main(String args[]) { StringBuffer c = new StringBuffer("Hello"); StringBuffer c1 = new StringBuffer(" World"); c.append(c1); System.out.println(c); } }

A. Hello
B. World
C. Helloworld
D. Hello World
Answer» E.
Discussion
1261.

What is the output of this program? class output { public static void main(String args[]) { StringBuffer c = new StringBuffer("Hello"); c.delete(0,2); System.out.println(c); } }

A. He
B. Hel
C. lo
D. llo
Answer» E.
Discussion
1262.

What is the output of this program? class output { public static void main(String args[]) { String a = "hello i love java"; System.out.println(a.indexOf('e')+" "+a.indexOf('a')+" "+a.lastIndexOf('l')+" "+a.lastIndexOf('v')); } }

A. 6 4 6 9
B. 5 4 5 9
C. 7 8 8 9
D. 1 14 8 15
Answer» B. 5 4 5 9
Discussion
1263.

What is the string contained in s after following lines of code? StringBuffer s new StringBuffer("Hello"); s.deleteCharAt(0);

A. Hell
B. ello
C. Hel
D. llo
Answer» C. Hel
Discussion
1264.

Which of these method of class StringBuffer is used to find the length of current character sequence?

A. length()
B. Length()
C. capacity()
D. Capacity()
Answer» B. Length()
Discussion
1265.

Which of these method of class StringBuffer is used to concatenate the string representation to the end of invoking string?

A. concat()
B. append()
C. join()
D. concatenate()
Answer» C. join()
Discussion
1266.

Which of these class is used to create an object whose character sequence is mutable?

A. String()
B. StringBuffer()
C. Both of the mentioned
D. None of the mentioned
Answer» C. Both of the mentioned
Discussion
1267.

What is the output of this program? class output { public static void main(String args[]) { String s = "Hello World"; int i = s.indexOf('o'); int j = s.lastIndexOf('l'); System.out.print(i + " " + j); } }

A. 4 8
B. 5 9
C. 4 9
D. 5 8
Answer» D. 5 8
Discussion
1268.

What is the output of this program? class output { public static void main(String args[]) { String s1 = "Hello World"; String s2 = s1.substring(0 , 4); System.out.println(s2); } }

A. Hell
B. Hello
C. Worl
D. World
Answer» B. Hello
Discussion
1269.

What is the output of this program? class output { public static void main(String args[]) { String s1 = "Hello"; String s2 = s1.replace('l','w'); System.out.println(s2); } }

A. hello
B. helwo
C. hewlo
D. hewwo
Answer» E.
Discussion
1270.

What is the output of this program? class output { public static void main(String args[]) { String s1 = "one"; String s2 = s1 + " two"; System.out.println(s2); } }

A. one
B. two
C. one two
D. compilation error
Answer» D. compilation error
Discussion
1271.

What is the output of this program? class output { public static void main(String args[]) { String c = " Hello World "; String s = c.trim(); System.out.println("\""+s+"\""); } }

A. “”Hello World””
B. “”Hello World”
C. “Hello World”
D. Hello world
Answer» D. Hello world
Discussion
1272.

Which of the following statement is correct?

A. replace() method replaces all occurrences of one character in invoking string with another character
B. replace() method replaces only first occurrences of a character in invoking string with another character
C. replace() method replaces all the characters in invoking string with another character
D. replace() replace() method replaces last occurrence of a character in invoking string with another character
Answer» B. replace() method replaces only first occurrences of a character in invoking string with another character
Discussion
1273.

What is the value returned by function compareTo() if the invoking string is greater than the string compared?vvvvv

A. zero
B. value less than zero
C. value greater than zero
D. none of the mentioned
Answer» D. none of the mentioned
Discussion
1274.

Which of these method of class String is used to remove leading and trailing whitespaces?

A. startsWith()
B. trim()
C. Trim()
D. doTrim()
Answer» C. Trim()
Discussion
1275.

What will s2 contain after following lines of code? String s1 = "one"; String s2 = s1.concat("two")

A. One
B. Two
C. onetwo
D. twoone
Answer» D. twoone
Discussion
1276.

Which of these method of class String is used to extract a substring from a String object?

A. substring()
B. Substring()
C. SubString()
D. None of the mentioned
Answer» B. Substring()
Discussion
1277.

What is the output of this program? class output { public static void main(String args[]) { String chars[] = {"a", "b", "c", "a", "c"}; for (int i = 0; i < chars.length; ++i) for (int j = i + 1; j < chars.length; ++j) if(chars[i].compareTo(chars[j]) == 0) System.out.print(chars[j]); } }

A. ab
B. bc
C. ca
D. ac
Answer» E.
Discussion
1278.

In the below code, which code fragment should be inserted at line 3 so that the output will be: “123abc 123abc”? 1 StringBuilder sb1 = new StringBuilder("123"); 2 String s1 = "123"; 3 // insert code here 4 System.out.println(sb1 + " " + s1);

A. sb1.append(“abc”); s1.append(“abc”);
B. sb1.append(“abc”); s1.concat(“abc”);
C. sb1.concat(“abc”); s1.append(“abc”);
D. sb1.append(“abc”); s1 = s1.concat(“abc”);
Answer» E.
Discussion
1279.

What is the output of this program? class output { public static void main(String args[]) { String s1 = "Hello"; String s2 = new String(s1); String s3 = "HELLO"; System.out.println(s1.equals(s2) + " " + s2.equals(s3)); } }

A. true true
B. false false
C. true false
D. false true
Answer» D. false true
Discussion
1280.

What is the output of this program? class output { public static void main(String args[]) { String s1 = "Hello i love java"; String s2 = new String(s1); System.out.println((s1 == s2) + " " + s1.equals(s2)); } }

A. true true
B. false false
C. true false
D. false true
Answer» E.
Discussion
1281.

What is the output of this program? class output { public static void main(String args[]) { String c = "Hello i love java"; boolean var; var = c.startsWith("hello"); System.out.println(var); } }

A. true
B. false
C. 0
D. 1
Answer» C. 0
Discussion
1282.

Which of these data type value is returned by equals() method of String class?

A. char
B. int
C. boolean
D. all of the mentioned
Answer» D. all of the mentioned
Discussion
1283.

What is the value returned by function compareTo() if the invoking string is less than the string compared?

A. zero
B. value less than zero
C. value greater than zero
D. none of the mentioned
Answer» C. value greater than zero
Discussion
1284.

Which of these method of class String is used to check whether a given object starts with a particular string literal?

A. startsWith()
B. endsWith()
C. Starts()
D. ends()
Answer» B. endsWith()
Discussion
1285.

Which of these methods is used to compare a specific region inside a string with another specific region in another string?

A. regionMatch()
B. match()
C. RegionMatches()
D. regionMatches()
Answer» E.
Discussion
1286.

Which of these method of class String is used to compare two String objects for their equality?

A. equals()
B. Equals()
C. isequal()
D. Isequal()
Answer» B. Equals()
Discussion
1287.

What is the output of this program? class output { public static void main(String args[]) { char ch; ch = "hello".charAt(1); System.out.println(ch); } }

A. h
B. e
C. I
D. o
Answer» C. I
Discussion
1288.

What is the output of this program? class output { public static void main(String args[]) { char c[]={'a', '1', 'b' ,' ' ,'A' , '0'}; for (int i = 0; i < 5; ++i) { if(Character.isDigit(c[i])) System.out.println(c[i]+" is a digit"); if(Character.isWhitespace(c[i])) System.out.println(c[i]+" is a Whitespace character"); if(Character.isUpperCase(c[i])) System.out.println(c[i]+" is an Upper case Letter"); if(Character.isLowerCase(c[i])) System.out.println(c[i]+" is a lower case Letter"); i=i+3; } } }

A. a is a lower case Letter is White space character
B. b is a lower case Letter is White space character
C. a is a lower case Letter A is a upper case Letter
D. a is a lower case Letter 0 is a digit
Answer» D. a is a lower case Letter 0 is a digit
Discussion
1289.

What is the output of this program? class output { public static void main(String args[]) { String a = "hello i love java"; System.out.println(a.indexOf('i')+" "+a.indexOf('o') +" "+a.lastIndexOf('i')+" "+a.lastIndexOf('o')); } }

A. 6 4 6 9
B. 5 4 5 9
C. 7 8 8 9
D. 4 3 6 9
Answer» B. 5 4 5 9
Discussion
1290.

What is the output of this program? class output { public static void main(String args[]) { String c = "Hello i love java"; int start = 2; int end = 9; char s[]=new char[end-start]; c.getChars(start,end,s,0); System.out.println(s); } }

A. Hello, i love java
B. i love ja
C. lo i lo
D. llo i l
Answer» E.
Discussion
1291.

Which of these methods can be used to convert all characters in a String into a character array?

A. charAt()
B. both getChars() & charAt()
C. both toCharArray() & getChars()
D. all of the mentioned
Answer» D. all of the mentioned
Discussion
1292.

What will be output of the following code? public class Boxer1 { Integer i; int x; public Boxer1(int y) { x = i+y; System.out.println(x); } public static void main(String[] args) { new Boxer1 (new Integer(4)); } }

A. The value “4” is printed at the command line
B. Compilation fails because of an error in line
C. A NullPointerException occurs at runtime
D. An IllegalStateException occurs at runtime
Answer» E.
Discussion
1293.

In below code, what can directly access and change the value of the variable name? package test; class Target { public String name = "hello"; }

A. any class
B. only the Target class
C. any class in the test package
D. any class that extends Target
Answer» D. any class that extends Target
Discussion
1294.

Which of these methods is an alternative to getChars() that stores the characters in an array of bytes?

A. getBytes()
B. GetByte()
C. giveByte()
D. Give Bytes()
Answer» B. GetByte()
Discussion
1295.

Which of these method of class String is used to extract more than one character at a time a String object?

A. getchars()
B. GetChars()
C. Getchars()
D. getChars()
Answer» E.
Discussion
1296.

What is the output of this program? class String_demo { public static void main(String args[]) { char chars[] = {'a', 'b', 'c'}; String s = new String(chars); String s1 = "abcd"; int len1 = s1.length(); int len2 = s.length(); System.out.println(len1 + " " + len2); } }

A. 3 0
B. 0 3
C. 3 4
D. 4 3
Answer» E.
Discussion
1297.

What is the output of this program? class String_demo { public static void main(String args[]) { int ascii[] = { 65, 66, 67, 68}; String s = new String(ascii, 1, 3); System.out.println(s); } }

A. ABC
B. BCD
C. CDA
D. ABCD
Answer» C. CDA
Discussion
1298.

What is the output of this program? class String_demo { public static void main(String args[]) { char chars[] = {'a', 'b', 'c'}; String s = new String(chars); System.out.println(s); } }

A. a
B. b
C. c
D. abc
Answer» E.
Discussion
1299.

Which of these constructors is used to create an empty String object?

A. String()
B. String(void)
C. String(0)
D. None of the mentioned
Answer» B. String(void)
Discussion
1300.

Which of these method of class String is used to extract a single character from a String object?

A. CHARAT()
B. chatat()
C. charAt()
D. ChatAt()
Answer» D. ChatAt()
Discussion