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1. Introduction to HDFS 1.1. HDFS Concepts 1.1.1. Blocks l HDFS too has the concept of a block, but it is a much larger unit 64 MB by default. l Like in a filesystem for a single disk, files in HDFS are broken into block-sized chunks, which are stored as independent units. l Unlike a filesystem for. 阅读全文
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问题1. public static void append(String str){ str += " Append!"; } public static void append(StringBuffer sBuffer){ sBuffer.append(" Append!"); } public void test(){ String str = "Nothing"; append(str); System.out.println(str); StringBuffer sBuffer = new StringBuffer(&quo 阅读全文