Java Map 中获取最大值 Value 和对应的 Key
Java Map 中获取最大值 Value 和对应的 Key
案例如下
import java.util.*; public class MaxMapDemo { public static void main(String[] args) { Map<String, Object> map = new HashMap(); map.put("张三", 28); map.put("李四", 18); map.put("王五", 8); System.out.println("Map中Value(值)的最大值的Key:" + getMaxStr(map)); } public static String getMaxStr(Map<String, Object> map) { int maxV = 0; String maxK = null; //临时值,保存每次最大值键,下个值比他大就将他替掉,换成新值 String maxKRemove = null; Map<String, Object> map2 = new TreeMap(); Iterator keys = map.keySet().iterator(); while (keys.hasNext()) { Object key = keys.next(); maxK = key.toString(); int value = Integer.parseInt(map.get(key).toString()); if (value > maxV) { if (null != maxKRemove) { map2.clear(); } maxV = value; map2.put(maxK, maxV); maxKRemove = maxK; } else if (value == maxV) { map2.put(maxK, maxV); } } Iterator keys2 = map2.keySet().iterator(); String strKey = ""; int value = 0; while (keys2.hasNext()) { Object key = keys2.next(); maxK = key.toString(); value = Integer.parseInt(map.get(key).toString()); String[] maxKey = maxK.split("_"); strKey = maxKey[0]; } System.out.println("Key:" + strKey + ",Value:" + value); return strKey; }
输出的结果
Key:张三,Value:28
Map中Value(值)的最大值的Key:张三