TreeMap中文排序,TreeMap倒序輸出排列
阿新 • • 發佈:2018-09-05
entry color 處理文本 接口 info ima import @override imp
1、TreeMap集合倒序排列
import java.util.Comparator; /** * 比較算法的類,比較器 * @author Administrator * */ public class MyCmp implements Comparator<Object> { // 實現倒序 @Override public int compare(Object o1, Object o2) { int x = o2.toString().compareTo(o1.toString()); return x; } }
import java.util.Iterator; import java.util.TreeMap; public class TestMap { public static void main(String[] args) { TreeMap<String,String> map = new TreeMap<String,String> (new MyCmp()); map.put("10001","張某"); map.put("10005","孫某"); map.put("10003","方某"); map.put("10004","譚某"); map.put("10002","李某"); Iterator<String> it = map.keySet().iterator(); while(it.hasNext()){ String key = it.next(); System.out.println(key+"="+map.get(key)); } } }
2、TreeMap中文排序
import java.text.CollationKey; import java.text.Collator;import java.util.Comparator; /** * 處理中文排序 * @author Administrator * */ public class MyCmp1 implements Comparator<Object> { Collator collator = Collator.getInstance(); /** * 提供以與自然語言無關的方式來處理文本,日期,數字和消息的類和接口 * 獲取當前默認語言環境的Collator */ @Override public int compare(Object o1, Object o2) { // TODO Auto-generated method stub CollationKey key1 = collator.getCollationKey(o1.toString()); CollationKey key2 = collator.getCollationKey(o2.toString()); return key1.compareTo(key2); } }
import java.util.Iterator; import java.util.Map.Entry; import java.util.Set; import java.util.TreeMap; public class TestMap1 { public static void main(String[] args) { TreeMap<String,String> map = new TreeMap<String,String>(new MyCmp1()); map.put("艾倫", "1001"); map.put("過去", "1002"); map.put("以後", "1003"); map.put("明天", "1004"); map.put("未來", "1005"); Set<Entry<String,String>> set = map.entrySet(); Iterator<Entry<String,String>> it = set.iterator(); while(it.hasNext()){ Entry<String, String> e = it.next(); System.out.println(e.getKey()+"="+e.getValue()); } } }
TreeMap中文排序,TreeMap倒序輸出排列