Array of Objects Java

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I'm in my first JAVA class and I got this far with my code. I'm trying to use the for loop to print off the properties.

This is the main.

public class PostOffice {

    public static void main(String[] args) {
        MailBox[] PostOffice = new MailBox[5];

        PostOffice [0] = MailBox(123,"Bob");
        PostOffice [1] = MailBox(456,"John";
        PostOffice [2] = MailBox(789,"Mark");
        PostOffice [3] = MailBox(200,"Bill");
        PostOffice [4] = MailBox(444,"Sam"); 

        for (int i = 0; i < 5; i++) {
            System.out.println (PostOffice[i]. getMailboxNumber());
            System.out.println (PostOffice[i].getOwnerName());  
        }
    }
}

public class MailBox {
    private int mailboxNumber;
    private String owerName;
    private boolean mailDelivered;
    public static  int totalNumberOFMailboxes;

    public MailBox(){
    }
    public MailBox(int theNumber, String theOwner){
        mailboxNumber = theNumber;
        owerName = theOwner;
    }
    public int getMailboxNumber(){
       return mailboxNumber;
    }
    public String getOwnerName(){
        return owerName;
    }
    public void setOwnerName(String someName){
        owerName = someName; 
    }
    public  boolean getMailDelivered(){
        return mailDelivered;
    }
    public void setMailDelivered(boolean ismail){
        mailDelivered = ismail; 
    }
}

I don't think Im setting the properties in the array correct.My complier keeps giving me this error

error: cannot find symbol PostOffice [0] = MailBox(123,"Bob"); symbol: method MailBox(int,String) location: class PostOffice

You are not creating a new object, try the following

PostOffice [0] = new MailBox(123,"Bob");

Arrays in Java, Since arrays are objects in Java, we can find their length using member length. This is different from C/C++ where we find length using sizeof. A Java array  Array of Objects Declaration With Size We can also declare an array of objects with an initial size, let's say 4. Object[] objectArray = new Object[4]; objectArray[0] = "Java Programming"; objectArray[1] = new Integer(8); objectArray[2] = new Character('z'); objectArray[3] = new Integer(4);

You need to create object in Java using new operator. So, the following line:

PostOffice [0] = MailBox(123,"Bob");
PostOffice [1] = MailBox(456,"John";
PostOffice [2] = MailBox(789,"Mark");
PostOffice [3] = MailBox(200,"Bill");
PostOffice [4] = MailBox(444,"Sam"); 

Need to changed to:

PostOffice [0] = new MailBox(123,"Bob");
PostOffice [1] = new MailBox(456,"John";
PostOffice [2] = new MailBox(789,"Mark");
PostOffice [3] = new MailBox(200,"Bill");
PostOffice [4] = new MailBox(444,"Sam"); 

Array Of Objects In Java | Java Object Arrays, The array of objects, as defined by its name, stores an array of objects. An object represents a single record in memory, and thus for multiple  Array Of Objects In Java The array of objects, as defined by its name, stores an array of objects. An object represents a single record in memory, and thus for multiple records, an array of objects must be created. It must be noted, that the arrays can hold only references to the objects, and not the objects themselves.

Rookie mistake, don't worry I got you!

Whenever you create a new object, make sure to use the new keyword. That way, space is allocated for your new object. So put this in replacement of creating your object.

PostOffice [0] = new MailBox(123,"Bob");

Oh, and when you're creating your other MailBox objects, make sure to add the new keyword as well ;-)

Happy Coding!

Day 5 -- Arrays, Conditionals, and Loops, How do you create an array of classes in Java? Array of Objects in Java After having good command over the class and objects, you must have understood how useful the concept of class and objects can be. Now, imagine you are making a task scheduler application and you have made a 'Task' class having elements like date, time and title. Now, you have to store hundreds of tasks.

Arrays of objects | Think Java, Java Arrays of Objects. ArrayList and LinkedList are list classes in the Java library​. They both take care of allowing the list to grow to any size, and they provide  An array in Java can be created either with any data type or with any object like Student objects, Employee objects, Integer, Date etc. Following example on Array of Objects creates Student array and Integer array.

Java Arrays of Objects, In the Java programming language, arrays are objects (§4.3.1), are dynamically created, and may be All methods of class Object may be invoked on an array. Java Array of Object An object of class represents a single record in memory, if we want more than one record of class type, we have to create an array of class or object. As we know, an array is a collection of similar type, therefore an array can be a collection of class type.

Chapter 10. Arrays, This is correct. A[] a = new A[4]; creates 4 A references, similar to doing this: A a1; A a2; A a3; A a4;. Now you couldn't do a1.someMethod() without allocating  In the Java programming language, arrays are objects , are dynamically created, and may be assigned to variables of type Object . All methods of class Object may be invoked on an array. An array object contains a number of variables.

Comments
  • It is highly recommended to figure out the name of the language you're trying to write code in. Java is not Javascript.
  • You are using the same name PostOffice for the name of a class and also for a method-local variable. This is highly discouraged, and you should follow standard Java naming conventions (initial caps for class names, initial lower-case for variables).