StringBuffer与StringBuilder的demo案例判断线程是否安全

最新推荐文章于 2024-10-09 08:00:00 发布

原创最新推荐文章于 2024-10-09 08:00:00 发布 · 3.5k 阅读

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#安全 #java #线程安全

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本文通过实战对比分析，探讨了在10次外部循环和100次内部循环中，StringBuffer与StringBuilder在并发环境下的线程安全性差异，观察到非预期的结果并解析其原因。

//main方法测试StringBuffer与StringBuilder的线程
public static void main(String[] args) {
StringBuffer buffer = new StringBuffer();
StringBuilder builder = new StringBuilder();
//遍历循环10次
for (int i = 0; i < 10; i++) {
new CustomThread(buffer, builder).start();
}
}
-------------------------------------------------------------------------------------
/**
*集成线程Thread方法
*遍历循环：给的是100
*/

public class CustomThread extends Thread {
private StringBuffer buffer;
private StringBuilder builder;

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

@Override
public void run() {
    for (int i = 0; i < 100; i++) {
        buffer.append("A");
        builder.append("Z");
        try {
            Thread.sleep(10);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
    System.out.println("StringBuffer Size:" + buffer.length()
            + " | "
            + "StringBuilder Size:" + builder.length());
}}