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igomit [66]
3 years ago
9

Which of the following is not possible? A class that implements two interfaces. A class that inherits from two classes. A class

that inherits from one class, and implements an interface. All of these are possible.
Computers and Technology
1 answer:
ozzi3 years ago
4 0

Answer:

"A class that inherits from two classes"

Explanation:

If we're talking about Java, you can't extend from two classes. The reason for this is Java doesn't allow multiple inheritance.

The reason for this is to avoid the ambiguity caused by it. One of the cases where multiple inheritance can cause ambiguity is the diamond problem.

Diamond problem can occur if two classes (say B and C) inherit from one class (say A). And another class (say D) inherits from both B & C.

If B and C class override the same method from A class. And D class calls that method, which one will be called, class B's or C's??

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Answer:

The solution is as follows.

class LFilters implements Lock {

int[] lvl;

int[] vic;

public LFilters(int n, int l) {

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vic = new int[max(n-l+1,0)];

for (int i = 0; i < n-l+1; i++) {

lvl[i] = 0;

}

}

public void lock() {

int me = ThreadID.get();

for (int i = 1; i < n-l+1; i++) { // attempt level i

lvl[me] = i;

vic[i] = me;

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int above = l+1;

while (above > l && vic[i] == me) {

above = 0;

for (int k = 0; k < n; k++) {

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}

}

}

}

public void unlock() {

int me = ThreadID.get();

lvl[me] = 0;

}

}

Explanation:

The code is presented above in which the a class is formed which has two variables, lvl and vic. It performs the operation of lock as indicated above.

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