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Pass value and get return value from script

import javax.script.ScriptEngine; import javax.script.ScriptEngineManager; import javax.script.ScriptException; public class MonthlyPayment {   public static void main(String[] args) throws Exception {     ScriptEngineManager manager = new ScriptEngineManager();     ScriptEngine engine = manager.getEngineByExtension("js");     String calcMonthlyPaymentScript = "intrate = intrate/1200.0;"         + "payment = principal*intrate*(Math.pow (1+intrate, months)/"         + "                            (Math.pow (1+intrate,months)-1));";     engine.put("principal", 20000.0);     System.out.println("Principal = " + engine.get("principal"));     engine.put("intrate", 6.0);     System.out.println("Interest Rate = " + engine.get("intrate") + "%");     engine.put("months", 360);     System.out.println("Months = " + engine.get("months"));     engine.eval(calcMonthlyPaymentScript);     System.out.printf("Monthly Payment = %.2f\n", engine.get("payment"));   } }