StringConversion.java

public class StringConversion {
    public static void main(String[] args) {
        System.out.println("Creating...\n" + new StringConversion() +"\nDone!");
        System.out.println("null: " + null);
        System.out.println("nullObj: " + nullObj());
        System.out.println("nullStr: " + nullStr());
        System.out.println("nullToString: " + new NullToString());
        System.out.println("byte: " + (byte) 0);
        System.out.println("short: " + (short) 0);
        System.out.println("char: " + 'a');
        System.out.println("int: " + 0);
        System.out.println("long: " + 0L);
        // System.out.println("float: " + 0.0f); Not implemented yet
        // System.out.println("double: " + 0.0); Not implemented yet
        System.out.println("bool: " + true);
        System.out.println("bool: " + false);
    }

    public static Object nullObj() {
        return null;
    }

    public static String nullStr() {
        return null;
    }

    public String toString() {
        return "StringConversion";
    }

    public static class NullToString {
        public String toString() {
            return null;
        }
    }
}