java - 性能有什么大的区别吗？？当使用 TCP Socket I/O 代码时

Question

当使用 TCP Socket I/O 代码时..下面两个代码之间的性能是否有很大差异..？两者的结果是一样的~~

        // -------- 1 -------- //
        OutputStream out = sock.getOutputStream();
        PrintWriter pw = new PrintWriter(new OutputStreamWriter(out));

        // -------- 2 -------- //
        OutputStream out = sock.getOutputStream();
        PrintWriter pw = new PrintWriter(out);

Answer 1

不，不应该。引用the doc :

public PrintWriter(OutputStream out, boolean autoFlush)

Creates a new PrintWriter from an existing OutputStream. This convenience constructor creates the necessary intermediate OutputStreamWriter, which will convertcharacters into bytes using the default character encoding.

换句话说，在您的两种情况下都会创建一个新的 OutputStreamWriter 对象。