JuniorTheoryCommon

What happens when this program is compiled and run?

JAVA

public class Main {
    public static void main(String[] args) {
        Point a = new Point(5);
        Point b = new Point();
        System.out.println("end");
    }
}
class Point {
    Point(int x) {
        System.out.print(x + " ");
    }
}

It does not compile

Expecting 5 end: once a class declares any constructor, Java adds no default one, so new Point() does not compile.
Expecting 5 0 end or a run-time error: Java does not fill in missing arguments, and the compiler rejects the call before anything runs.

How would you change Point so that new Point() compiles and builds a point with x equal to 0?
Which constructor does Java add to a class that declares none?

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JuniorTheoryCommon

What happens when this program is compiled and run?

JAVA

public class Main {
    public static void main(String[] args) {
        Point a = new Point(5);
        Point b = new Point();
        System.out.println("end");
    }
}
class Point {
    Point(int x) {
        System.out.print(x + " ");
    }
}

It does not compile

Expecting 5 end: once a class declares any constructor, Java adds no default one, so new Point() does not compile.
Expecting 5 0 end or a run-time error: Java does not fill in missing arguments, and the compiler rejects the call before anything runs.

How would you change Point so that new Point() compiles and builds a point with x equal to 0?
Which constructor does Java add to a class that declares none?

Back to questions Open topic in roadmap →Answer it yourself — Quiz