How do I pass information to a constructor?

How do I pass information to a constructor?

Help! I am trying to complete my homework, but since I am taking an online course, I do not have the same resources for help that I might otherwise. I have been trying to do this for hours with no success. I know that the answer is probably simple – any hints available?
Here are the two existing classes that I am working with:

package c2;

public class Item {

String itemNum, itemName, itemUPC, itemQty, itemUM;

public Item(String iNum, String iName, String iUPC, String iQty, String iUM) {
itemNum = iNum;
itemName = iName;
itemUPC = iUPC;
itemQty = iQty;
itemUM = iUM;
}

public void show() {
System.out.println(itemNum);
System.out.println(itemName);
System.out.println(itemUPC);
System.out.println(itemQty);
System.out.println(itemUM);
}


public static void main(String []args) {
}
}


package c2;

public class ItemApp {
}

public static void main(String[] args) {
String itemNum = new String("99");
String itemName = new String("Cheerios 32oz");
String itemUPC = new String("4321");
String itemQty = new String("1");
String itemUM = new String("Gross");
System.out.println(itemNum);
System.out.println(itemName);
System.out.println(itemUPC);
System.out.println(itemQty);
System.out.println(itemUM);


}

}

I am asked to Comment out the code in ItemApp’s main method and then to add code that will:
1. Create an Item object and assign it to a variable called ItemObj
2. Pass the following 5 bits of information to the new Item object’s constructor:
44
Crest
6543
1
Half dozen
(I am told that these parameters must be separated by commas.
3. Finally, I am asked to invoke the Item object’s show method.
I am lost! The following is as far as I can get…and it is WRONG…any help please?

package c2;

public class ItemApp {

String Item;

public ItemApp(String itemObj) {
Item = itemObj;

}

public ItemApp() {
Item("44","Crest Tartar Ctrl 17 oz","5432","1","Dozen");
Item = new Item();
Item.show();
}


public static void main(String[] args) {
/* String itemNum = new String("99");
String itemName = new String("Cheerios 32oz");
String itemUPC = new String("4321");
String itemQty = new String("1");
String itemUM = new String("Gross");
System.out.println(itemNum);
System.out.println(itemName);
System.out.println(itemUPC);
System.out.println(itemQty);
System.out.println(itemUM);
*/

}




}

First, please wrap all java code in code tags. It's very difficult to read otherwise.

Now, I'll explain some of these concepts in a general sense so that you can apply them to your assignment.

A constructor does just that - it constructs the object. They are declared like this in their classes. Similarly, we'll define a simple show() method as well:

Code:

---

public class SomeClass
{
        //We'll save the values we get from the
        //constructor in variables called a and b
        private int a, b;
       
        //This is the constructor
        public SomeClass(int param1, int param2)
        {
                a = param1;
                b = param2;
        }
       
        //The show method simply prints the values
        public void show()
        {
                System.out.println(a + ", " + b);
        }
}

---

Now, if you want to create an object of type SomeClass, you simply use the new keyword like this:

Code:

---

public static void main(String[] args)
{
        //notice the parameters 1 and 2 (both int)
        //match the parameter types from the
        //constructor we defined earlier.
        SomeClass some = new SomeClass(1, 2);
       
        //Now, to invoke the show() method, simply
        //use dot notation like so:
       
        some.show();
}

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Hope this was helpful.

Quote:

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Originally Posted by AndrewM16921

Hope this was helpful.

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Yes, I think so...thanks!