Method for evaluating math expressions in Java

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There’s also exp4j, an expression evaluator based on Dijkstra's Shunting Yard. It’s freely available and redistributable under the Apache License 2.0, only about 25KB in size, and quite easy to use:

Calculable calc = new ExpressionBuilder("3 * sin(y) - 2 / (x - 2)")
        .withVariable("x", varX)
        .withVariable("y", varY)
        .build()
double result1=calc.calculate();

When using a newer API version like 0.4.8:

Expression calc = new ExpressionBuilder("3 * sin(y) - 2 / (x - 2)")
    .variable("x", x)
    .variable("y", y)
    .build();
double result1 = calc.evaluate();

There’s also a facility to use custom functions in exp4j.

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