[Solved] Need help understanding the output of this code. [closed]

Alright let’s see.

First you call Circle9()

that starts the constructor:

/** No-arg constructor */
public Circle9() {
this(1.0);
System.out.print("C");
}

As you can see the constructor first calls this(1.0)

This means that another constructor is opened and afterwards we print “C”

Alright the next Constructor is:

public Circle9(double radius) {
this(radius, "white", false);
System.out.print("D");
}

The same thing happens, first another constructor is called with this, and then D is printed

The next called constructor is:

public Circle9(double radius, String color, boolean filled) {
super(color, filled);
System.out.print("E");
}

This calls a super constructor. Since Circle9 extends GeometricObject it can use GeometricObject functions. So super(color,filled) calls

protected GeometricObject(String color, boolean filled) {
System.out.print("B");
}

And prints B, then E from before, then D and lastly C

output should be BEDC