史上最全Java面试题整理（附参考答案）

<span class="hljs-keyword"&gt;private <span class="hljs-keyword"&gt;static <span class="hljs-keyword"&gt;final <span class="hljs-keyword"&gt;int ECHO_SERVER_PORT = <span class="hljs-number"&gt;6789;

<span class="hljs-function"&gt;<span class="hljs-keyword"&gt;public <span class="hljs-keyword"&gt;static <span class="hljs-keyword"&gt;void <span class="hljs-title"&gt;main<span class="hljs-params"&gt;(String[] args) {        
    <span class="hljs-keyword"&gt;try(ServerSocket server = <span class="hljs-keyword"&gt;new ServerSocket(ECHO_SERVER_PORT)) {
        System.out.println(<span class="hljs-string"&gt;"服务器已经启动...");
        <span class="hljs-keyword"&gt;while(<span class="hljs-keyword"&gt;true) {
            Socket client = server.accept();
            <span class="hljs-keyword"&gt;new Thread(<span class="hljs-keyword"&gt;new ClientHandler(client)).start();
        }
    } <span class="hljs-keyword"&gt;catch (IOException e) {
        e.printStackTrace();
    }
}

<span class="hljs-keyword"&gt;private <span class="hljs-keyword"&gt;static <span class="hljs-class"&gt;<span class="hljs-keyword"&gt;class <span class="hljs-title"&gt;ClientHandler <span class="hljs-keyword"&gt;implements <span class="hljs-title"&gt;Runnable {
    <span class="hljs-keyword"&gt;private Socket client;

    <span class="hljs-function"&gt;<span class="hljs-keyword"&gt;public <span class="hljs-title"&gt;ClientHandler<span class="hljs-params"&gt;(Socket client) {
        <span class="hljs-keyword"&gt;this.client = client;
    }

    <span class="hljs-meta"&gt;@Override
    <span class="hljs-function"&gt;<span class="hljs-keyword"&gt;public <span class="hljs-keyword"&gt;void <span class="hljs-title"&gt;run<span class="hljs-params"&gt;() {
        <span class="hljs-keyword"&gt;try(BufferedReader br = <span class="hljs-keyword"&gt;new BufferedReader(<span class="hljs-keyword"&gt;new InputStreamReader(client.getInputStream()));
                PrintWriter pw = <span class="hljs-keyword"&gt;new PrintWriter(client.getOutputStream())) {
            String msg = br.readLine();
            System.out.println(<span class="hljs-string"&gt;"收到" + client.getInetAddress() + <span class="hljs-string"&gt;"发送的: " + msg);
            pw.println(msg);
            pw.flush();
        } <span class="hljs-keyword"&gt;catch(Exception ex) {
            ex.printStackTrace();
        } <span class="hljs-keyword"&gt;finally {
            <span class="hljs-keyword"&gt;try {
                client.close();
            } <span class="hljs-keyword"&gt;catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

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