Language Fundamentals - General Questions

JDK, JRE and JVM: which one contains the compiler javac?

Who is known as the father of Java?

What is the output of the following program?

public class Main {
    public static void main(String[] args) {
        System.out.println(1 + 2 + "3" + 4 + 5);
    }
}

What is the output of the following program?

public class Main {
    public static void main(String[] args) {
        var list = new java.util.ArrayList<String>();
        list.add("x");
        System.out.println(list.size());
    }
}

What is the default value of an int field (instance variable)?