Efficient Math Expression Evaluation in Java
Evaluating mathematical expressions is a common task in Java development. This can be achieved using various methods, each with its advantages and disadvantages.
Introducing exp4j
exp4j is a popular expression evaluator library for Java that utilizes Dijkstra's Shunting Yard algorithm. Its lightweight (around 25KB) and intuitive API make it a suitable choice for many applications.
Using exp4j for Expression Evaluation
To evaluate math expressions using exp4j:
Example Code:
<code class="java">// Version 0.4.7 and below Calculable calc = new ExpressionBuilder("3 * sin(y) - 2 / (x - 2)") .withVariable("x", varX) .withVariable("y", varY) .build() double result1=calc.calculate(); // Version 0.4.8 and above Expression calc = new ExpressionBuilder("3 * sin(y) - 2 / (x - 2)") .variable("x", x) .variable("y", y) .build(); double result1 = calc.evaluate();</code>
exp4j also supports custom function definition and evaluation, providing further flexibility.
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