New modification problem(Array)

Question

OK I had a previous code here a while back and it worked,.then i had to modify it to hold data,so i hit the books hard trying to figure it out.The program, Netbeans is wanting the Merch constructor to have a class of its own and i know that it is incorrect. I have switched the data entered to all double except the string and still error comes up. Please help me understand whats going on thanks.
package inventory2;
public class Merch
public static void main(String args [])
    double total;
    Merch prodArray[];
prodArray = new Merch[4];
prodArray[0] = new Merch("Computer",(double)8.0,(double)86.0,(double)79.95);
prodArray[1] = new Merch("Printer",(double)9.0,(double)68.0,(double)355.00);
prodArray[2] = new Merch("Apple",(double)1234.0,(double)10.0,(double)32.32);
prodArray[3] = new Merch("Baseball",(double)12345.0,(double)11.0,(double)20.32);
      for (int counter = 0; counter < 4; counter++)
         System.out.printf(Merch[counter].toString());
      total = (Merch[ 0 ].getTValue() +
               Merch[ 1 ].getTValue() +
               Merch[ 2 ].getTValue() +
               Merch[ 3 ].getTValue());
      System.out.printf( "The total value of the inventory is: $%.2f\n\n", total );
package inventory2;
public class Inventory2 {
    public class inventory2
          private String name;
          private double cost;
          private double amount;
          private double id;
          public double total;
          public inventory2(String name, double cost,double amount, double id)
                    this.name = name;
                    this.cost = cost;
                    this.amount = amount;
                    this.id = id;
          public String getName()
                    return this.name;
          public double getCost()
                     return this.cost;                 
          public double getAmount()
                     return this.amount;
          public double getId()
                     return this.id;
          public double getTValue()
              total = cost * amount;
              return amount;
   @Override
   public String toString ()   
        String formatString    = "Product Name : %s\n";
        formatString          += "ID Number : %d\n";
        formatString          += "Amount of units on hand : %d\n";
        formatString          += "Price per unit : $%.2f\n";
        formatString          += "Total value of  : $%.2f\n\n";
        return (String.format ( formatString, name, id, amount, cost, getTValue()) );
}

Answer 1

Error
Compiling 2 source files to C:\Documents and Settings\\My Documents\NetBeansProjects\Inventory2\build\classes
C:\Documents and Settings\\My Documents\NetBeansProjects\Inventory2\src\inventory2\Merch.java:15: cannot find symbol
symbol  : constructor Merch(java.lang.String,double,double,double)
location: class inventory2.Merch
prodArray[0] = new Merch("Computer",8.0,86.0,79.95);
C:\Documents and Settings\\My Documents\NetBeansProjects\Inventory2\src\inventory2\Merch.java:16: cannot find symbol
symbol  : constructor Merch(java.lang.String,double,double,double)
location: class inventory2.Merch
prodArray[1] = new Merch("Printer",9.0,68.0,355.00);
C:\Documents and Settings\\My Documents\NetBeansProjects\Inventory2\src\inventory2\Merch.java:17: cannot find symbol
symbol  : constructor Merch(java.lang.String,double,double,double)
location: class inventory2.Merch
prodArray[2] = new Merch("Apple",1234.0,10.0,32.32);
C:\Documents and Settings\\My Documents\NetBeansProjects\Inventory2\src\inventory2\Merch.java:18: cannot find symbol
symbol  : constructor Merch(java.lang.String,double,double,double)
location: class inventory2.Merch
prodArray[3] = new Merch("Baseball",12345.0,11.0,20.32);
C:\Documents and Settings\\My Documents\NetBeansProjects\Inventory2\src\inventory2\Merch.java:22: cannot find symbol
symbol  : variable Merch
location: class inventory2.Merch
         System.out.printf(Merch[counter].toString());
C:\Documents and Settings\\My Documents\NetBeansProjects\Inventory2\src\inventory2\Merch.java:25: cannot find symbol
symbol  : variable Merch
location: class inventory2.Merch
      total = (Merch[ 0 ].getTValue() +
C:\Documents and Settings\\My Documents\NetBeansProjects\Inventory2\src\inventory2\Merch.java:26: cannot find symbol
symbol  : variable Merch
location: class inventory2.Merch
               Merch[ 1 ].getTValue() +
C:\Documents and Settings\\My Documents\NetBeansProjects\Inventory2\src\inventory2\Merch.java:27: cannot find symbol
symbol  : variable Merch
location: class inventory2.Merch
               Merch[ 2 ].getTValue() +
C:\Documents and Settings\\My Documents\NetBeansProjects\Inventory2\src\inventory2\Merch.java:28: cannot find symbol
symbol  : variable Merch
location: class inventory2.Merch
               Merch[ 3 ].getTValue());
C:\Documents and Settings\\My Documents\NetBeansProjects\Inventory2\src\inventory2\Merch.java:27: incompatible types
found   : java.lang.String
required: double
               Merch[ 2 ].getTValue() +
10 errors
BUILD FAILED (total time: 0 seconds)