Question

Consider the following code snippet:

Employee programmer = new Employee(10254, "exempt");
String str = programmer.toString();

Assume that the Employee class has not implemented its own toString() method. What value will the variable str contain when this code is executed?

Group of answer choices

the variable will become a null reference

the code will not compile because Employee has not implemented toString()

the default from Object, which is the class name of the object and its hash code

the string representations of all of the field values

2

With very few exceptions, such as certain static constants, what access should fields of classes always have?

Group of answer choices

package

protected

public

private

3

How can a subclass modify a private field within its superclass?

Group of answer choices

use "super." followed by the name of the field

use a public method of the superclass

override the field with a field of the same name

use the name of the superclass field

4

Which is the difference between having a public field, and having a private field with public getter/setter methods?

Group of answer choices

there is effectively no difference between these approaches

getter/setter methods can be inherited, while fields cannot

setters can reject invalid values, and getters can do processing of the output

fields can be inherited, whereas getter/setter methods cannot

Answer 1

ANSWERS -

1) (c) the default from Object, which is the class name of the object and its hash code

The variable str will contain the object name along with its hash code when this code is executed.

2) (c) Public

Most of the time classes should also have Public declared.

3) (b) use a public method of the superclass

A subclass can modify a private field by using public method within its superclass.

4) (c) setters can reject invalid values, and getters can do processing of the output

Setters and getters to make write only or read only, it can also make sure that correct value is being set by placing some validations in setters and getters.

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