Review Questions

Given the following class, which of these static initializer blocks can be inserted after the comment?

public class MyClass {
    private static int count = 5;
    final static int STEP = 10;
    boolean alive;
    // INSERT STATIC INITIALIZER BLOCK HERE
}

Select the three correct answers.

What will be the result of attempting to compile and run the following code?

public class MyClass {
    public static void main(String[] args) {
        MyClass obj = new MyClass(l);
    }
    static int i = 5;
    static int l;
    int j = 7;
    int k;

    public MyClass(int m) {
        System.out.println(i + ", " + j + ", " + k + ", " + l + ", " + m);
    }
    { j = 70; l = 20; } // Instance Initializer Block
    static { i = 50; }  // Static Initializer Block
}

Select the one correct answer.

Given the following class, which instance initializer block inserted at the indicated location will allow the class to compile without errors?

public class MyClass {
    static int gap = 10;
    double length;
    final boolean active;

    // INSERT CODE HERE
}

Select the one correct answer.

What will be the result of attempting to compile and run the following program?

public class Initialization {
    private static String msg(String msg) {
        System.out.println(msg); return msg;
    }

    public Initialization() { m = msg("1"); }

    { m = msg("2"); }

    String m = msg("3");

    public static void main(String[] args) {
        Object obj = new Initialization();
    }
}

Select the one correct answer.

What will be the result of attempting to compile and run the following program?

public class Initialization {
    private static String msg(String msg) {
        System.out.println(msg); return msg;
    }

    static String m = msg("1");

    { m = msg("2"); }

    static { m = msg("3"); }

    public static void main(String[] args) {
        Object obj = new Initialization();
    }
}

Select the one correct answer.

Which of the labeled lines in the following code can be uncommented by removing the // characters and still allow the code to compile correctly?

class GeomInit {
//  int width = 14;             /* Line A */
    {
//      area = width * height;  /* Line B */
    }
    int width = 37;
    {
//      height = 11;            /* Line C */
    }
    int height, area;
//  area = width * height;      /* Line D */
    {
//      int width = 15;         /* Line E */
        area = 100;
    }
};

Select the two correct answers.