JEP--字符串表达式计算结果最强工具，3.3FINAL

输入字符串表达式，即可运算出结果，不必依靠慢吞吞的JSENGINE

import com.singularsys.jep.*;

/**
 * An example class to test custom functions with Jep.
 */
class CustFunc {
	
	/**
	 * Constructor.
	 */
	public CustFunc（） {

	}

	/**
	 * Main method. Create a new Jep object and parse an example expression
	 * that uses the SquareRoot function.
	 */
	public static void main（String args[]） {
		
		Jep parser = new Jep（）;        // Create a new parser
		String expr = “1 + half（2）“;
		object value;
		
		System.out.println（“Starting CustFunc...“）;
		// Add the custom function
		parser.getFunctionTable（）.addFunction（“half“ new Half（））;
		
		try {
			parser.parse（expr）;                 // Parse the expression
		} catch （ParseException e） {
			System.out.println（“Error while parsing“）;
			System.out.println（e.getMessage（））;
			return;
		}
		
		try {
			value = parser.evaluate（）;                    // Get the value
		} catch （EvaluationException e） {
			System.out.println（“Error during evaluation“）;
			System.out.println（e.getMessage（））;
			return;
		}
		
		System.out.println（expr + “ = “ + value）; // Print value
	}
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\bin\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jep\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jep\bigdecimal\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jep\bigdecimal\functions\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jep\configurableparser\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jep\configurableparser\matchers\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jep\configurableparser\tokens\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jep\functions\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jep\functions\strings\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jep\misc\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jep\misc\bitwise\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jep\misc\functions\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jep\misc\javaops\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jep\parser\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jep\reals\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jep\standard\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jep\walkers\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jepexamples\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jepexamples\applets\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jepexamples\consoles\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jepexamples\diagnostics\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jeptests\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jeptests\bigdecimal\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jeptests\bigdecimal\functions\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jeptests\functions\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jeptests\perf\
     目录           0  2008-11-30 15:45  jep-3.3.0-trial\build\com\singularsys\jeptests\perf\tests\
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