误区：大家都说StringBuilder在单线程下比StringBuffer效率高解决思路

误区：大家都说StringBuilder在单线程下比StringBuffer效率高
大家都说StringBuilder在单线程下比StringBuffer效率高，但我的运行结果怎么相反呢？？请大家测试一下，并指正。
我的程序如下：

Java code

public class StringTest{    public static void main(String args[]){        long startTime1 = System.currentTimeMillis();        String text = "";        for(int i=0;i<10000;i++){            text+=i;        }        System.out.println(System.currentTimeMillis()-startTime1);                long startTime2 = System.currentTimeMillis();        StringBuffer textBuffer = new StringBuffer("");        for(int i=0;i<10000;i++){            textBuffer.append(i);        }        System.out.println((System.currentTimeMillis()-startTime2));                long startTime3 = System.currentTimeMillis();        StringBuilder textBuilder = new StringBuilder("");        for(int i=0;i<10000;i++){            textBuilder.append(i);        }                System.out.println((System.currentTimeMillis()-startTime3));            }}

Java code

public class StringTest{    public static void main(String args[]){        int max = 1000000; //如果内存足够大，可以改成 max = Integer.MAX_VALUE;//        long startTime1 = System.currentTimeMillis();//        String text = "";//        for(int i=0;i<10000;i++){//            text+=i; //这个就不用测了，大家都知道这种是效率最低的//        }//        System.out.println(System.currentTimeMillis()-startTime1);                long startTime2 = System.currentTimeMillis();        StringBuffer textBuffer = new StringBuffer("");        for(int i=0;i<max;i++){            textBuffer.append(i);        }        System.out.println((System.currentTimeMillis()-startTime2));                long startTime3 = System.currentTimeMillis();        StringBuilder textBuilder = new StringBuilder("");        for(int i=0;i<max;i++){            textBuilder.append(i);        }                System.out.println((System.currentTimeMillis()-startTime3));            }}