A programmer has written the following methods, which are supposed to insert an int into an OBT, and return the depth of an OBT respectively. Unfortunately there are some errors. Assume appropriate definitions for the instance variables empty, value, left and right, and the method setValue(), as shown in COMP16212.

public void insert(int insertValue)
{
}
public int getDepth()
{
else
{
} }
if (empty) setValue(insertValue);

else if (insertValue < value) left.insert(insertValue);

else right.insert(insertValue);

if (empty) return 0;
int leftDepth = left.getDepth(); int rightDepth = right.getDepth(); if (leftDepth > rightDepth)
return leftDepth + value; else
return rightDepth + value;

He or she creates an OBT by starting with an empty one, and inserting the numbers 15, 12, 8, 13, 20, 16, 25 in that order. What value would be returned by the getDepth() method, if it was invoked on the root node of the resulting tree?

Given the following initialized Java declaration:

PrintWriter out = new PrintWriter(new FileWriter("films.txt"));
which one of the following statements is true?

A. Whenever the statement
out.println("Welcome to films.txt");
is executed it will always write the string "Welcome to films.txt" to standard
output.

B. An exception is thrown when the declaration is executed in a context where the
file named films.txt has write-only permission.

C. IftheStringvariablesisnullwhenthestatement
out.print(s);
is executed, a NullPointerException object will be thrown.

D. ARuntimeExceptionexceptionwillalwaysbethrownwhenth estatement out.print("What is infinity? " + 1.0/0.0);
is executed.

E. The statement
out.close();
will compile without error because the PrintWriter class has a close() method,
as files are not closed safely on normal termination.

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Mr John Latham