動態調用動態語言，第 2 部分: 在運行時尋找、執行和修改腳本

    /**
     * Reads all script files in the scriptDirectory and runs them with this borrower's
     * information to see if he/she qualifies for each mortgage product.
     */
    private static void runQualifications(
        ScriptMortgageQualifier mortgageQualifier,
        Borrower borrower,
        Loan loan,
        Property property
    ) {
        for (File scriptFile : getScriptFiles(scriptDirectory)) {
            // Print info about the borrower, loan and property.
            System.out.println("Processing file: " + scriptFile.getName());
            System.out.println("  Borrower: " + borrower.getName());
            System.out.println("  Credit score: " + borrower.getCreditScore());
            System.out.println("  Sales price: " + property.getSalesPrice());
            System.out.println("  Down payment: " + loan.getDownPayment());

            MortgageQualificationResult result = null;
            try {
                // Run the script rules for this borrower on the loan product.
                result = mortgageQualifier.qualifyMortgage(
                    borrower, property, loan, scriptFile
                );
            } catch (FileNotFoundException fnfe) {
                System.out.println(
                    "Can't read script file: " + fnfe.getMessage()
                );
            } catch (IllegalArgumentException e) {
                System.out.println(
                    "No script engine available to handle file: " +
                    scriptFile.getName()
                );
            } catch (ScriptException e) {
                System.out.println(
                    "Script '" + scriptFile.getName() +
                    "' encountered an error: " + e.getMessage()
                );
            }

            if (result == null) continue; // Must have hit exception.

            // Print results.
            System.out.println(
                "* Mortgage product: " + result.getProductName() +
                ", Qualified? " + result.isQualified() +
                "\n* Interest rate: " + result.getInterestRate() +
                "\n* Message: " + result.getMessage()
            );
            System.out.println();
        }
    }

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