StringBuilder,StringBuffer

最新推荐文章于 2025-04-17 08:27:28 发布

那句曾经

最新推荐文章于 2025-04-17 08:27:28 发布

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分类专栏： java 文章标签： stringbuffer stringbuilder 线程安全多线程

本文链接：https://blog.youkuaiyun.com/u014671811/article/details/78823190

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StringBuilder效率高,线程不安全
StringBuffer效率相对StringBuilder较低,线程安全
多线程中StringBuilder执行.insert(index,*);方法可能会出错

测试代码

public static class TestRunable implements Runnable
    {
        private int num=0;
        private StringBuffer sBuffer;
        private StringBuilder stringBuilder;
        private Random random;
        public TestRunable(int i,StringBuffer sBuffer,StringBuilder stringBuilder) {
            num=i;
            this.sBuffer=sBuffer;
            this.stringBuilder=stringBuilder;
            random=new Random();
        }
        @Override
        public void run() {
            // TODO Auto-generated method stub
            try {
                Thread.sleep(random.nextInt(5)+5);
                sBuffer.append(num+"\t");
                sBuffer.insert(num-1,num);
                stringBuilder.append(num+"\t");
                stringBuilder.insert(num-1,num);
                System.out.println("----------------线程"+num+"执行中----------------");
                System.out.println("sBuffer="+sBuffer);
                System.out.println("stringBuilder="+stringBuilder);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

        }

    }
//测试代码如下
  StringBuffer sBuffer=new StringBuffer();
        StringBuilder stringBuilder=new StringBuilder();
        Random random=new Random();


        Thread[] ts=new Thread[20];
        for(int i=0;i<ts.length;i++)
        {
            ts[i]=new Thread(new TestRunable(i+1, sBuffer, stringBuilder));
            ts[i].start();
        }