史上最全Java面试题整理（附参考答案）

<span class="hljs-function"&gt;<span class="hljs-keyword"&gt;private <span class="hljs-title"&gt;MyUtil<span class="hljs-params"&gt;() {
    <span class="hljs-keyword"&gt;throw <span class="hljs-keyword"&gt;new AssertionError();
}

<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;fileCopy<span class="hljs-params"&gt;(String source,String target) <span class="hljs-keyword"&gt;throws IOException {
    <span class="hljs-keyword"&gt;try (InputStream in = <span class="hljs-keyword"&gt;new FileInputStream(source)) {
        <span class="hljs-keyword"&gt;try (OutputStream out = <span class="hljs-keyword"&gt;new FileOutputStream(target)) {
            <span class="hljs-keyword"&gt;byte[] buffer = <span class="hljs-keyword"&gt;new <span class="hljs-keyword"&gt;byte[<span class="hljs-number"&gt;4096];
            <span class="hljs-keyword"&gt;int bytesToRead;
            <span class="hljs-keyword"&gt;while((bytesToRead = in.read(buffer)) != -<span class="hljs-number"&gt;1) {
                out.write(buffer,<span class="hljs-number"&gt;0,bytesToRead);
            }
        }
    }
}

<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;fileCopyNIO<span class="hljs-params"&gt;(String source,String target) <span class="hljs-keyword"&gt;throws IOException {
    <span class="hljs-keyword"&gt;try (FileInputStream in = <span class="hljs-keyword"&gt;new FileInputStream(source)) {
        <span class="hljs-keyword"&gt;try (FileOutputStream out = <span class="hljs-keyword"&gt;new FileOutputStream(target)) {
            FileChannel inChannel = in.getChannel();
            FileChannel outChannel = out.getChannel();
            ByteBuffer buffer = ByteBuffer.allocate(<span class="hljs-number"&gt;4096);
            <span class="hljs-keyword"&gt;while(inChannel.read(buffer) != -<span class="hljs-number"&gt;1) {
                buffer.flip();
                outChannel.write(buffer);
                buffer.clear();
            }
        }
    }
}

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