Instruction
- Total number of questions : 10.
- Time alloted : 10 minutes.
- Each question carry 1 mark.
- No Negative marks
- DO NOT refresh the page.
- All the best :-).
| 1. |
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); } } |
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Your Answer: Option (Not Answered) Correct Answer: Option D Explanation: String(chars) is a constructor of class string, it initializes string s with the values stored in character array chars, therefore s contains “abc”. |
| 2. |
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')); } } |
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Your Answer: Option (Not Answered) Correct Answer: Option A Explanation: indexof(‘c’) and lastIndexof(‘c’) are pre defined function which are used to get the index of first and last occurrence of the character pointed by c in the given array. |
| 3. |
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); } } |
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Your Answer: Option (Not Answered) Correct Answer: Option C Explanation: None. |
| 4. |
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); } } |
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Your Answer: Option (Not Answered) Correct Answer: Option D Explanation: delete(0,2) is used to delete the characters from 0 th position to 1 st position. |
| 5. |
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); } } |
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Your Answer: Option (Not Answered) Correct Answer: Option C Explanation: The replace() method replaces the given string from the specified beginIndex and endIndex. |
| 6. |
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)); } } |
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Your Answer: Option (Not Answered) Correct Answer: Option D Explanation: The == operator compares two object references to see whether they refer to the same instance, where as equals() compares the content of the two objects. |
| 7. |
Which of the following package stores all the standard java classes? |
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Your Answer: Option (Not Answered) Correct Answer: Option B Explanation: None. |
| 8. |
Which of the following package stores all the standard java classes? |
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Your Answer: Option (Not Answered) Correct Answer: Option B Explanation: None. |
| 9. |
Which of the following package stores all the simple data types in java? |
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Your Answer: Option (Not Answered) Correct Answer: Option A Explanation: None. |
Test 1