import java.util.Random;

import bsh.EvalError;
import bsh.Interpreter;

public class Test2 {
    
    public static void main(String[] args) throws EvalError {        
        final int count = 5000;
        final int paramCount = 4;
        
        double[][] datas = new double[paramCount][count];
        Random ran = new Random();
        for(int i = 0; i < datas.length; i++) {
            for(int j = 0; j < datas[i].length; j++) {
                datas[i][j] = ran.nextDouble() * count;
            }
        }
        double[] results = new double[count];
        
        long t0, t1;
        t0 = System.currentTimeMillis();
        
        String exp = "$0 + $1 * $2 + $3";
        eval(exp, results, datas);
        
        t1 = System.currentTimeMillis();
        System.out.println(t1 - t0);
        
        // 测试正确性
        double[] res = new double[count];
        for(int j = 0; j < datas[0].length; j++) {
           for(int i = 0; i < datas.length; i++) {
               res[j] = datas[0][j] + datas[1][j] * datas[2][j] + datas[3][j]; 
           }
        }
        
        for(int i = 0; i < count; i++) {
            if(results[i] != res[i]) {
                System.out.printf("error! %.6f --> %.6f%n", results[i], res[i]);
            }
        }
    }
    
    public static void eval(String expression, double[] results, double[]... datas) throws EvalError {
        
        String ep = expression.replaceAll("\\$(\\d+)", "datas[$1][j]");
        
        String exp =
            " for(int j = 0; j < datas[0].length; j++) {" +
            "   for(int i = 0; i < datas.length; i++) {" +
            "     results[j] = " + ep + ";" +
            "   } " +
            " }";
        Interpreter bsh = new Interpreter();
        bsh.set("datas", datas);
        bsh.set("results", results);
        bsh.eval(exp);
        results = (double[])bsh.get("results");
    }
}

------解决方案--------------------
xuexi

------解决方案--------------------
BeanShell 支持的是 Java 语言

------解决方案--------------------

哈哈，我终于知道前面为什么要 600ms 了，因为我多做了几次循环，哎，真粗心！