how should I set <PrintWhenExperssion> value true or false from java code

I want to set

<printWhenExpression>![CDATA[Boolean.valueOf(true)]]</printWhenExpressio开发者_StackOverflow中文版n>

to Boolean.valueOf(false) when I fill the report according to some conditions. This means I want to set value 'false' in <printWhenExpression> at run time. Can any one help me for this?

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Instead of having hard coded value Boolean.valueOf(true)/Boolean.valueOf(false) use a variable which is evaluation to a boolean:

Boolean.valueOf(someVariableOfTypeBoolean)

or

Boolean.valueOf(someMethodThatReturnsBoolean())