You will write an Average Word Length program that uses a Boolean parameter called caseSensitive to determine whether the Mapper class should treat upper and lower case letters as different (case-sensitive) or whether all letters should be converted to lower case (case-insensitive).
Write down the Mapper output, Reducer input, and Reducer output using the case- insensitive version of your program for the test input provided above.
Java 统计字符串的长度,忽略字母的大小写
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- threenewbee 2018-09-25 03:49关注
import java.util.HashMap; import java.util.Set; class Untitled { public static double foo(String s, Boolean caseSensitive) { HashMap map = new HashMap(); String[] words = s.split("[\\,\\(\\)\\.\\s\\r\\n\\-]"); for (String item : words) { if (item.trim().equals("")) continue; if (!caseSensitive) item = item.toLowerCase(); if (!map.containsKey(item)) map.put(item, item.length()); } double r = 0.0; Set<String> wl = map.keySet(); for (String w : wl) r += (double)w.length(); r /= (double)wl.size(); return r; } public static void main(String[] args) { String s = "You will write an Average Word Length program that uses a Boolean parameter called caseSensitive to determine whether the Mapper class should treat upper and lower case letters as different (case-sensitive) or whether all letters should be converted to lower case (case-insensitive).\r\nWrite down the Mapper output, Reducer input, and Reducer output using the case- insensitive version of your program for the test input provided above."; System.out.println(foo(s, true)); System.out.println(foo(s, false)); } }
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