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Arrays and String java MCQs

Quiz by Tamil selvi

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35 questions
Show answers
  • Q1
    Which method in Java is used to find the length of a string?
    count()
    length()
    length
    size()
    30s
  • Q2
    Which method in Java is used to concatenate two strings?
    merge()
    append()
    concat()
    join()
    30s
  • Q3
    Which method in Java is used to convert a string to lowercase?
    convertToLower()
    changeCase()
    toLowerCase()
    toUpperCase()
    30s
  • Q4
    Which method in Java is used to replace a specific character or substring within a string?
    replaceAll()
    substring()
    insert()
    replace()
    30s
  • Q5
    Which method is used to find the index of a specific character in a string in Java?
    indexOf
    search
    locate
    find
    30s
  • Q6
    Which method is used to extract a substring from a string in Java?
    substring
    split
    slice
    extract
    30s
  • Q7
    Which method is used to compare two strings for equality in Java?
    compare
    check
    equals
    equalTo
    30s
  • Q8
    Which method is used to convert an integer to a string in Java?
    intToString
    convertToString
    toString
    parse
    30s
  • Q9
    Which of the following constructors is used to create an empty String object?
    String()
    String(null)
    None of the above
    String("")
    30s
  • Q10
    What is the output of the following code? public class T{ public static void main(String []args) { char chars[] = {‘a’, ‘b’, ‘c’}; String str = new String(chars); System.out.println(str);}}
    c abc
    abc
    b
    Compile Time Error
    30s
  • Q11
    What is the output of the following code? public class Test{ public static void main(String []args) { String str = “JAVA IS A PROGRAMMING LANGUAGE”; System.out.println(str.charAt(10)); }}
    P
    V
    O
    A
    30s
  • Q12
    String object is ___________ in java.
    interface
    mutable
    immutable
    method
    30s
  • Q13
    Which of the following String method removes beginning and ending spaces of the given string.
    intern()
    fork()
    join()
    trim()
    30s
  • Q14
    What is the output of the following code segment? class StringTest{ public static void main(String args[]){ String name=”Oswaal”; name.concat(“Publication”); System. out.println(name);}}
    Oswaal
    compilation error
    runtime error
    OswaalPublication
    30s
  • Q15
    What is the output of the following code? public class Test{ public static void main(String [] args) { String str1 = “Eye”; String str2 = “Arm”; System.out.println(str1.charAt(0) > str2. charAt(0));}}
    true
    false
    1
    0
    30s

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