Review Questions
| 7.1 |
What will be the result of attempting to compile and run the following code?
public class MyClass {
public static void main(String[] args) {
Outer objRef = new Outer();
System.out.println(objRef.createInner().getSecret());
}
}
class Outer {
private int secret;
Outer() { secret = 123; }
class Inner {
int getSecret() { return secret; }
}
Inner createInner() { return new Inner(); }
}
Select the one correct answer.
|
| 7.2 |
Which statements are true about nested classes? Select the two correct answers.
|
| 7.3 |
What will be the result of attempting to compile and run the following code?
public class MyClass {
public static void main(String[] args) {
State st = new State();
System.out.println(st.getValue());
State.Memento mem = st.memento();
st.alterValue();
System.out.println(st.getValue());
mem.restore();
System.out.println(st.getValue());
}
public static class State {
protected int val = 11;
int getValue() { return val; }
void alterValue() { val = (val + 7) % 31; }
Memento memento() { return new Memento(); }
class Memento {
int val;
Memento() { this.val = State.this.val; }
void restore() { ((State) this).val = this.val; }
}
}
}
Select the one correct answer.
|
| 7.4 |
What will be the result of attempting to compile and run the following program?
public class Nesting {
public static void main(String[] args) {
B.C obj = new B().new C();
}
}
class A {
int val;
A(int v) { val = v; }
}
class B extends A {
int val = 1;
B() { super(2); }
class C extends A {
int val = 3;
C() {
super(4);
System.out.println(B.this.val);
System.out.println(C.this.val);
System.out.println(super.val);
}
}
}
Select the one correct answer.
|
| 7.5 |
Which statements are true about the following program?
public class Outer {
public void doIt() {
}
public class Inner {
public void doIt() {
}
}
public static void main(String[] args) {
new Outer().new Inner().doIt();
}
}
Select the two correct answers.
|
