TreeMap排序Comparator()重写
package map_;
import java.util.Comparator;
import java.util.TreeMap;
/*
* @author YAM
*/
public class TreeMap01 {
public static void main(String[] args) {
TreeMap treeMap = new TreeMap(new Comparator() {
@Override
public int compare(Object o1, Object o2) {
// return ((String) o1).compareTo((String) o2);
return ((String) o1).length() - ((String) o2).length();
// 长度相同 返回0 即认为相等, 会发生覆盖
}
});
treeMap.put("jack","杰克");
treeMap.put("tom", "汤姆");
treeMap.put("kristina", "克瑞斯提诺");
treeMap.put("smith", "斯密斯");
treeMap.put("hsp", "韩顺平");//length=3与tom相同加入不了,覆盖汤姆
System.out.println("treemap="+treeMap);
}
}