convert java type object to string fail for some java types

Question

Im using the following code to convert type object to string, fieldValue defined as is type object .

keyl.put(fieldName, (String) fieldValue);

the values of the type object can be only java types such as

java decimal ,byte,float, calendar ,date etc ...

when i got in fieldValue value of java.util.date I got an exception since the casting is not success. how can i overcome this issue?

If fieldValue is Object type then maybe instead of casting use fieldValue.toString(), or if it can be primitive type then String.valueOf(fieldValue). — Pshemo
– Pshemo, Commented Jun 19, 2013 at 15:36
If fieldValue is possibly null then String.valueOf(fieldValue) will prevent NullPointerException — selig
– selig, Commented Jun 19, 2013 at 15:38
@Pshemo Exactly :). OP gets an efficient answer,If he clarifies what is field-value. — Suresh Atta
– Suresh Atta, Commented Jun 19, 2013 at 15:42

Pshemo · Accepted Answer · 2013-11-28 11:36:26Z

5

If you want to get String representation of Object you can use fieldValue.toString() method. In case fieldValue can be primitive type (it wont have any methods) you can use String.valueOf(fieldValue).

edited Nov 28, 2013 at 11:36

answered Jun 19, 2013 at 15:46

Pshemo

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Suresh Atta · Accepted Answer · 2013-06-19 15:40:20Z

2

String is an Object but all the Objects are not Strings.

The cast can be to its own class type or to one of its subclass or superclass types or interfaces.

There are some rules of Object type casting in Java id it's a primitive type you can do

String.valueOf(fieldValue)

edited Jun 19, 2013 at 15:40

answered Jun 19, 2013 at 15:34

Suresh Atta

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