BigDecimal don't understand, doesn't add up right

[epicwinter]

I don't understand how I am suppose to use the bigdecimal class. If i
do this:
BigDecimal total = new BigDecimal(0);
total.add(new BigDecimal(100));
total.add(new BigDecimal(112.222));
System.err.println("total: " +new Double(total.setScale(2,
java.math.BigDecimal.ROUND_HALF_UP).doubleValue()));

The output is zero. Why? Everytime you intialize the big decimal to
zero it won't function?

 

[Oliver Wong]

I don't understand how I am suppose to use the bigdecimal class. If i
do this:
BigDecimal total = new BigDecimal(0);
total.add(new BigDecimal(100));
total.add(new BigDecimal(112.222));
System.err.println("total: " +new Double(total.setScale(2,
java.math.BigDecimal.ROUND_HALF_UP).doubleValue()));

The output is zero. Why? Everytime you intialize the big decimal to
zero it won't function?

BigDecimal is immutable. When you do total.add(new BigDecimal(100)),
you're not changing the value. Rather, a new BigDecimal object is created
and returned, but you're throwing away this new object. You should write
your code as:

total = total.add(new BigDecimal(100));

for example.

- Oliver

 

[Mike Schilling]

I don't understand how I am suppose to use the bigdecimal class. If i
do this:
BigDecimal total = new BigDecimal(0);
total.add(new BigDecimal(100));
total.add(new BigDecimal(112.222));
System.err.println("total: " +new Double(total.setScale(2,
java.math.BigDecimal.ROUND_HALF_UP).doubleValue()));

The output is zero. Why? Everytime you intialize the big decimal to
zero it won't function?

BigDecimals are immutable, like strings.

Try::

total = total.add(new BigDecimal(100));
etc.

 

[epicwinter]

banging head against wall...
thanks

BigDecimals are immutable, like strings.

Try::

total = total.add(new BigDecimal(100));
etc.