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JavaForm

JavaForm(expr)

: returns the Symja Java form of the expr. In Java you can use the created Symja expressions by declaring import static org.matheclipse.core.expression.F.*;

>>> JavaForm[I/2*E^((-I)*x)-I/2*E^(I*x)]
"Plus(Times(CC(0L,1L,1L,2L),Power(E,Times(CNI,x))),Times(CC(0L,1L,-1L,2L),Power(E,Times(CI,x))))"

JavaForm evaluates its argument before creating the Java form:

>>> JavaForm(D(sin(x)*cos(x),x))
"Plus(Sqr(Cos(x)),Negate(Sqr(Sin(x))))"

You can use Hold to suppress the evaluation:

>>> JavaForm(Hold(D(sin(x)*cos(x),x)))
"D(Times(Sin(x),Cos(x)),x)"