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public class Invoice
{
public double amount;
public Date date = new Date(); public string customer;
public string specification;
public string administrator = ¡°unspecified¡±; static private int number_of_invoices()=0; public invoice£¨£©£» {
number_of_invoices++£» }
public void print£¨£© {
System.out.println(\number of invoices is¡±+ int number_of_invoices); } }
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