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

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

1.one

2.two

3.twoone

4.onetwo

Posted Date:-2021-10-25 05:40:10

More MCQS Questions and answers

  1. �Standard output variable �out� is defined in which class?
  2. Output : package pkg; class output { public static void main(String args[]) { StringBuffer s1 = new StringBuffer("Hello"); s1.setCharAt(1, x); System.out.println(s1); } }
  3. What is the string contained in s after following lines of code? StringBuffer s new StringBuffer(Hello); s.deleteCharAt(0);
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  5. What is the value returned by unction compareTo() if the invoking string is less than the string compared?
  6. What will s2 contain after following lines of code? String s1 = one; String s2 = s1.concat(two)
  7. What will s2 contain after following lines of code? StringBuffer s1 = one; StringBuffer s2 = s1.append(two)
  8. Which of the following are incorrect form of StringBuffer class constructor?
  9. Which of the following is correct way of importing an entire package pkg?
  10. Which of the following is incorrect statement about packages?
  11. Which of the following is method of System class is used to find how long a program takes to execute?
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  13. Which of the following is method of wrapper Integer for converting the value of an object into byte?
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  18. Which of the following statement is correct?
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  20. Which of these class can encapsulate an entire executing program?
  21. Which of these class can generate an array which can increase and decrease in size automatically?
  22. Which of these class have only one field �TYPE�?
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  24. Which of these class is superclass of String and StringBuffer class?
  25. Which of these class is used to create an object whose character sequence is mutable?
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  28. Which of these is a mechanism for naming and visibility control of a class and its content?
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  35. Which of these method can be used to increase the capacity of ArrayList object manually?
  36. Which of these method of ArrayList class is used to obtain present size of an object?
  37. Which of these method of class String is used to check weather a given object starts with a particular string literal?
  38. Which of these method of class String is used to compare two String objects for their equality?
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  40. Which of these method of class String is used to obtain length of String object?
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  42. Which of these method of class StringBuffer is used to concatenate the string representation to the end of invoking string?
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  44. Which of these method of class StringBuffer is used to find the length of current character sequence?
  45. Which of these methods can be used to obtain a static array from an ArrayList object?
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  48. Which of these methods is used to obtain value of invoking object as a long?
  49. Which of these operators can be used to concatenate two or more String objects?
  50. 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?
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