Public class Test { public static void main(String[] args) {
new Circle9();
}
}
public abstract class GeometricObject {
protected GeometricObject() {
System. out. print("A");
}
protected GeometricObject(String color, boolean filled) {
System. out. print("B");
}
}
public class Circle9 extends GeometricObject {
/** Default constructor */
public Circle9() {
this(1.0);
System. out. print("C");
}
/** Construct circle with a specified radius */
public Circle9(double radius) {
this(radius, "white", false);
System. out. print("D");
}
/** Construct a circle with specified radius, filled, and color */
public Circle9(double radius, String color, boolean filled) {
super(color, filled);
System. out. print("E");
}
}
The answer is BEDC but how did it come about?

| Circle9(), System.out.print("C");

| Circle9(double radius), System.out.print("D");

| Circle9(double radius, String color, boolean filled) System.out.print("E");

| GeometricObject(String color, boolean filled) System.out.print("B");

Starting From The Bottom

Explanation:

Just debug it.

But you'll get BEDC due to the code arrangement.

In your main: new Circle9();

So, let's go to Circle9()

public class Circle9 extends GeometricObject {  

public Circle9() {

this(1.0);

System.out.print("C");

}

We need to head to Circle9(double radius) because this(1.0) was called, System.out.print("C"); will not be processed just yet

So, let's go to Circle9(double radius)

public Circle9(double radius) {

this(radius, "white", false);

System.out.print("D");

}

Again, we need to leave this call and head to another, Circle9(double radius, String color, boolean filled), because of this(radius, "white", false); was called System.out.print("D"); will not be processed just yet

So, let's go to Circle9(double radius, String color, boolean filled)

public Circle9(double radius, String color, boolean filled) {

super(color, filled);

System.out.print("E");

}

So here super is called which just calls the "parent"  GeometricObject(String color, boolean filled).

After that, B is outputted to Console

We then print out E

We then print out D

We then print out C

So more concise:

Run Through This Backwards

| Circle9(), System.out.print("C");

| Circle9(double radius), System.out.print("D");

| Circle9(double radius, String color, boolean filled) System.out.print("E");

| GeometricObject(String color, boolean filled) System.out.print("B");

The constructor calls create this chain

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