| A Java expression.
Unlike most of CodeModel, JExpressions are built bottom-up (
meaning you start from leaves and then gradually build compliated expressions
by combining them.)
JExpression defines a series of composer methods,
which returns a complicated expression (by often taking other
JExpression s
as parameters.
For example, you can build "5+2" by
JExpr.lit(5).add(JExpr.lit(2))
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