String StringBuffer StringBuilder性能比较

最新推荐文章于 2024-03-14 01:50:34 发布

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本文提供了一个Java程序示例，通过对比String、StringBuffer与StringBuilder在循环追加字符串时的性能表现，展示了不同字符串操作方式的效率差异。

public class Huhu {
    public static void main(String[] args) {
        Integer s0 = 0;
        long startTime0 = System.currentTimeMillis();

        while (true) {
            s0 += 1;
            if (s0 == 100000) {
                long endTime0 = System.currentTimeMillis();
                System.out.println(endTime0 - startTime0);
                break;
            }
        }

        String s1 = "";
        long startTime1 = System.currentTimeMillis();
        for (int i = 0; i < 10000; i++) {
            s1 +='a';
        }
        long endTime1 = System.currentTimeMillis();
        System.out.println(endTime1 - startTime1);
        
        StringBuffer s2 = new StringBuffer();
        long startTime2 = System.currentTimeMillis();
        for (int i = 0; i < 10000; i++) {
            s2 = s2.append("a");
        }
        long endTime2 = System.currentTimeMillis();
        System.out.println(endTime2 - startTime2);

        StringBuilder s3 = new StringBuilder();
        long startTime3 = System.currentTimeMillis();
        for (int i = 0; i < 10000; i++) {
            s3 = s3.append("a");
        }
        long endTime3 = System.currentTimeMillis();
        System.out.println(endTime3 - startTime3);
    }

}