Peter Penzov - 4 years ago 144
Java Question

# How to calculate BigDecimal

I created this JUnit test in order to test how to calculate all values from Objects with value BigDecimal.

import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.junit.Test;

public class BigDecimalTest
{
private BigDecimal sumAmounts(List<ExpressCheckout> myList)
{
BigDecimal total = new BigDecimal(BigInteger.ZERO);
for (ExpressCheckout item : myList)
{
}
}

@Test
public void testBigDecimalTest()
{
try
{
List<ExpressCheckout> list = new ArrayList<>();
for (int i = 0; i < 12; i++)
{
ExpressCheckout obj = new ExpressCheckout();
obj.setCurrency("USD");

Random rand = new Random();

int n = rand.nextInt(50) + 1;
obj.setAmount(new BigDecimal(n));
obj.setQuantity(1);
obj.setName("test name");
obj.setDescription("test description");
}

BigDecimal sumAmounts = sumAmounts(list);

System.out.println(">>>>>>>>>>>>>>>>>>>> sumAmounts " + sumAmounts.toString());

}
catch (Exception ex)
{
Logger.getLogger(BigDecimalTest.class.getName()).log(Level.SEVERE, null, ex);
}
}

public class ExpressCheckout
{
String currency;
BigDecimal amount;
int quantity;
String name;
String description;

public ExpressCheckout()
{
}

public ExpressCheckout(String currency, BigDecimal amount, int quantity, String name, String description)
{
this.currency = currency;
this.amount = amount;
this.quantity = quantity;
this.name = name;
this.description = description;
}

public String getCurrency()
{
return currency;
}

public void setCurrency(String currency)
{
this.currency = currency;
}

public BigDecimal getAmount()
{
return amount;
}

public void setAmount(BigDecimal amount)
{
this.amount = amount;
}

public int getQuantity()
{
return quantity;
}

public void setQuantity(int quantity)
{
this.quantity = quantity;
}

public String getName()
{
return name;
}

public void setName(String name)
{
this.name = name;
}

public String getDescription()
{
return description;
}

public void setDescription(String description)
{
this.description = description;
}
}

}

For some reason I get result
sumAmounts 0
Any idea why I get this result and how I can fix it?
The result should be calculated from all BigDecimal values from the Java List.