Problem on converting between different variable types

Question

I have a Basket Class and a Customer Class
The following is the way I declare the variable "basketID" in the type of Basket. How to initialise this variable in this case?
public class Customer{
private Basket basketID;
public Customer()
   basketID = 0; // This is not working because I cannot assign the int type value to a Basket type variable.
     .Also How do I write this type of data into the *.txt file? The basketID cannot be written into the *.txt file...
Any way to solve this problem?
public void writeInfo()
    try {
      PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(
          "C:\\Documents and Settings\\Charles\\My Documents\\customerDetail.txt", true)));
      out.println();
      out.write(customerID);
      out.write("  ");
      out.write(basketID); // This is not working because incompatible type between the variable and the write() method.
         .

Answer 1

Charles_Wong wrote:
I have a Basket Class and a Customer Class
The following is the way I declare the variable "basketID" in the type of Basket. How to initialise this variable in this case?
public class Customer{
private Basket basketID;
public Customer()
basketID = 0; // This is not working because I cannot assign the int type value to a Basket type variable.
You need to start with a basic Java tutorial. You're trying to assign the integer value 0 to an object reference. Do you understand why that will never work?
>
>
Also How do I write this type of data into the *.txt file? The basketID cannot be written into the *.txt file...
Any way to solve this problem?
public void writeInfo()
try {
PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(
"C:\\Documents and Settings\\Charles\\My Documents\\customerDetail.txt", true)));
out.println();
out.write(customerID);
out.write("  ");
out.write(basketID); // This is not working because incompatible type between the variable and the write() method.
Have you read the API docs for PrintWriter? Do you understand why you cannot pass an object into that method?