Java: why don't these variables initialize?

Question

I'm working on an example from Bruce Eckel's book and i was wondering why the initialized values don't stick when I output them?

class InitialValues2 { 
    boolean t = true;
    char c = 'x';
    byte b = 47;
    short s = 0xff;
    int i =999; 
    long l =1;
    float f = 3.14f;
    double d =3.14159;
    InitialValues reference; 



    void printInitialValues() { 
     System.out.println("data type  Initial values");
     System.out.println("boolean  " + t); 
     System.out.println("char   [" + c + "]"); 
     System.out.println("byte  " + b); 
     System.out.println("short  " + s); 
     System.out.println("int   " + i); 
     System.out.println("long  " + l); 
     System.out.println("float  " + f); 
     System.out.println("double  " + d);
     System.out.println("reference  " + reference);

    } //end printinitialvalues

    public static void main(String args[]) { 
     InitialValues iv = new InitialValues(); 
     iv.printInitialValues();

     //new InitialValues().printInitialValues();

    } //end main 

}

All the variables output 0 and null values.

Answer 1

I see one problem. The variables are declared in a class called InitialValues2, yet you are calling the printInitialValues() method on an object that is of the type InitialValues. It appears that you are never calling your printInitialValues() method.

Answer 2

Your class name is InitialValues2 but you're creating an InitialValues object. Replace "InitialValues iv = new InitialValues()" with "InitialValues2 iv = new InitialValues2()"

Answer 3

In the main method you are creating a new InitialValues, not an InitialValues2 (the class posted).

Answer 4

class InitialValues { 
    boolean t = true;
    char c = 'x';
    byte b = 47;
    short s = 0xff;
    int i =999; 
    long l =1;
    float f = 3.14f;
    double d =3.14159;
    InitialValues reference; 



    void printInitialValues() { 
        System.out.println("data type           Initial values");
        System.out.println("boolean             " + t); 
        System.out.println("char                [" + c + "]"); 
        System.out.println("byte                " + b); 
        System.out.println("short               " + s); 
        System.out.println("int                 " + i); 
        System.out.println("long                " + l); 
        System.out.println("float               " + f); 
        System.out.println("double              " + d);
        System.out.println("reference           " + reference);

    } //end printinitialvalues

    public static void main(String args[]) { 
        InitialValues iv = new InitialValues(); 
        iv.printInitialValues();

        //new InitialValues().printInitialValues();

    } //end main 
}

You're class is called InitialValues2 You should rename it to InitialValues.