证明StringBuffer比StringBuilder线程安全的

最新推荐文章于 2021-06-20 10:53:27 发布

原创最新推荐文章于 2021-06-20 10:53:27 发布 · 165 阅读

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本文通过创建多个线程同时对StringBuilder和StringBuffer进行操作，比较了两者在并发环境下的性能差异。实验中，每个线程分别对StringBuilder和StringBuffer追加10000次字符，共启动10个线程。最后输出了两个对象的长度及长度差，以直观展示两者的效率。

AlphaThread.java

package com.company.stringbuffer;

public class AlphaThread extends Thread {

    StringBuilder builder;
    StringBuffer buffer;
    AlphaThread(StringBuilder builder, StringBuffer buffer){
        this.builder = builder;
        this.buffer = buffer;
    }

    @Override
    public void run() {
        super.run();
        for (int i = 0; i < 10000; i++)
        {
            buffer.append("1");
            builder.append("1");
        }

        System.out.println("buffer:"+buffer.length()+" builder:"+builder.length()+" xx:"+(buffer.length()-builder.length()));
    }
}

MainTest.java

package com.company.stringbuffer;

public class MainTest {
    public static void main(String[] args)
    {
        StringBuilder builder = new StringBuilder();
        StringBuffer buffer = new StringBuffer();
        for (int i = 0; i < 10; i++)
        {
            new AlphaThread(builder, buffer).start();
        }
    }
}