Java.lang Class - General Questions

What is the output of the following program?

public class Main {
    public static void main(String[] args) {
        Integer a = 127, b = 127;
        Integer c = 128, d = 128;
        System.out.println((a == b) + " " + (c == d));
    }
}

What is the output of the following program?

public class Main {
    public static void main(String[] args) {
        System.out.println(Math.max(3, 7) + " " + Math.abs(-2.5) + " " + Math.round(2.5) + " " + Math.round(-2.5));
    }
}

Which class is the root of the Java class hierarchy?

What is the output of the following program?

public class Main {
    public static void main(String[] args) {
        System.out.println(Math.abs(-7.5));
    }
}

What is the output of the following program?

public class Main {
    public static void main(String[] args) {
        System.out.println(Integer.MAX_VALUE + 1);
    }
}