java-SringBuilder线程不安全-StrngBuffer线程安全

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java-SringBuilder线程不安全-StrngBuffer线程安全，主要就是看看源码上有没有加锁

查看源码可知
StringBuffer

    public synchronized StringBuffer append(CharSequence s) {
        toStringCache = null;
        super.append(s);
        return this;
    }

StringBuilder

    @Override
    public StringBuilder append(CharSequence s) {
        super.append(s);
        return this;
    }