Java Data Structure

1.Assume double[][]x = new double[4][5], what are x.length and x[2].length?

A 4 and 4

B.5 and 5

C.4 and 5

D.5 and 4

2.Which of the following is incorrect?

A.A constructor may invoke a static method.

B.A constructor may be static.

C.A constructor may be private.

D. invoke an overloaded constructor.

3.Given two reference variables t1 and t2, if t1 == t2 is true, t1.equals(t2) must be(  )

A.false

B.true

4.Which method can be used to write data?

A.print

B.rename

C.exist

D.close

5.Which method can be used to read a whole line from the file?

A.nextlnt

B.nextDouble

C.nextLine

D.next

6.What is the best suitable relationship between Employee and Faculty?

A.Aggregation

B.Inheritance

C.None

D.Composition