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Given:
11. public static void main(String[] args) {
12. Integer i = uew Integer(1) + new Integer(2);
13. switch(i) {
14. case 3: System.out.println(”three”); break;
15. default: System.out.println(”other”); break;
16. }
17. }
‘What is the result?
1 three
2 other
3 An exception is thrown at runtime.
4 Compilation fails because of an error on
line 12.
- 9 Answers
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Answer / venkata krishna
Hi,
Answer is 1 means three..
line 12 is executing sucuessfully ,after that i is 3 now
line 13 is switch also executed successfully and print the
three
| Is This Answer Correct ? | 8 Yes | 2 No |
In the line 12 .jus think new Integer(1) will result 1 and
new Integer(2) will result 2 so 1+2=3 which is stored in a i.
so the line 12 can b written as a Integer i=1+2;
the answer is 1) three
| Is This Answer Correct ? | 5 Yes | 1 No |
In the line 12 .jus think new Integer(1) will result 1 and
new Integer(2) will result 2 so 1+2=3 which is stored in a i.
so the line 12 can b written as a Integer i=1+3;
| Is This Answer Correct ? | 4 Yes | 1 No |
Answer / kumar
The above scenario using Wrapper class.The Wrapper class
allows arthmetic opertion(Boxing and unboxing the interget
numbers).So the result will be "three"
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / nirmal
Ans 4: Compilation fails because of an error on
line 12.
Reason: The operator + is undefined for the argument type
(s) java.lang.Integer, java.lang.Integer Cannot switch on a
value of type Integer. Only int values or enum constants
are permitted.
| Is This Answer Correct ? | 0 Yes | 4 No |
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Question 7 [8] Consider the following class and answer the questions below it: public class StackWithGuard extends Stack { public StackWithGuard(int size) { super(size); } synchronized public boolean isEmpty() { return super.isEmpty(); } synchronized public boolean isFull() { return super.isFull(); } synchronized public int getSize() { return super.getSize(); } synchronized public void push(Object obj) { try { while (isFull()) { wait(); } } catch (InterruptedException e) {} super.push(obj); COS2144/102 11 notify(); } synchronized public Object pop() { try { while (isEmpty()) { wait(); } } catch (InterruptedException e) {} Object result = super.pop(); notify(); return result; } public static void main(String args[]) { StackWithGuard stack = new StackWithGuard(5); new Producer(stack, 15).start(); new Consumer(stack, 15).start(); } } Note: The Stack class is provided in the Appendix. Note also: The following questions all refer to the pop() method of the StackWithGuard class given above. 7.1 What does the synchronized keyword ensure for this method? (2) 7.2 Why is a while loop used to test whether the stack is empty? In other words, why wouldn't the following if statement be sufficient? if (isEmpty()) { wait(); } (2) 7.3 Why is the result of popping (provided by the inherited pop() method) stored in a temporary variable? In other words, why wouldn't the following statement be sufficient? return super.pop(); (2) 7.4 Why is the while loop placed in a try-catch structure? (2) Appendix The LinkedQueue class: public class LinkedQueue implements Queue { private Node first, last; private int count; public LinkedQueue() { first = last = null; count =0; } public int size() { return count; } public boolean isEmpty() { return (count == 0); 12 } public void enqueue(Object o) { Node node = new Node(); node.element = o; node.next = null; node.prev = last; if (last != null){ last.next = node; } else { last = first = node; } last = node; count++; } public void dequeue() { if ((first!= null) & (first.next!=null)) { first = first.next; first.prev = null; count--; } else { first = last = null; count--; } } public Object front() { return first; } } class Node { Object element; Node next, prev; } The Stack class: public class Stack { protected Object rep[]; protected int top = -1; protected int size = 0; protected int count = 0; public Stack(int size) { if (size > 0) { this.size = size; rep = new Object[size]; } } public boolean isFull() { return (count == size); } public boolean isEmpty() { return (count == 0); } public int getSize() { return size; } public void push(Object e) { if (e != null && !isFull()) { COS2144/102 13 top++; rep[top] = e; count ++; } } public Object pop() { Object result = null; if (!isEmpty()) { result = rep[top]; top--; count--; } return result; } }
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