Which of the following is used to write instances of Java classes directly into a file?

a.

ObjectInputStream

b.

FileInputStream

c.

DataInputStream

d.

None of the other answers

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Which of the following is valid in Java, if class XYZ is a directed superclass of class ABC and class XYZ is also a "directed" subclass of class EFG (suppose they all have no-argument constructors)?

a.

XYZ b = new ABC();

b.

EFG a = new ABC();

c.

All of the other answers

d.

EFG c = new XYZ();

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this.localVar = this.aMC(); Given the above valid statement, which of the following is correct?

a.

This statement assigns a local variable with a value obtained from a method calling.

b.

This statement indicates that the associated class has at least one field and one method.

c.

This statement must be in a method body of the class itself.

d.

All of the other answers