选择某种Map集合保存学号从1到15的学员的学号(键)和姓名(值)................

Posted 2020-10-17 呓亿

 

import java.util.Comparator;
import java.util.Iterator;
import java.util.Set;
import java.util.TreeMap;

public class MapTest {

public static void main(String[] args) {
// TODO 自动生成的方法存根
TreeMap map = new TreeMap( new MyComparator());
map.put("003", "代1");
map.put("006", "代2");
map.put("009", "代");
map.put("011", "代4");
map.put("015", "代5");
map.put("013", "代6");
map.put("012", "代7");
map.put("014", "代8");
map.put("010", "代9");
map.put("008", "代10");
map.put("007", "代11");
map.put("002", "代12");
map.put("005", "代13");
map.put("004", "代14");
map.put("001", "代15");

Set keySet = map.keySet();
Iterator it = keySet.iterator();
while(it.hasNext())
{
Object key = it.next();
Object value = map.get(key);
System.out.println(key + ":"+value);
}
}

}

class MyComparator implements Comparator{
public int compare(Object obj1, Object obj2) {

String l1=(String)obj1;
String l2=(String)obj2;
return l1.compareTo(l2);
}

}