public class TreeMapDemo { public static void main(String[]

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public class TreeMapDemo { public static void main(String[] args) {
TreeMap tr=new TreeMap(new Mycomparator()); tr.put("A", 12); tr.put("B", 13); tr.put("C", 14); tr.put("D", 15); System.out.println(tr); } } class Mycomparator implements Comparator{ @Override public int compare(Object o,Object oo) { String s1=(String)o; String s2=(String)oo; return s2.compareTo(s1); } } 我问下,这加入 new Mycomparator() 的作用在哪边?我把他删除了.照样可以输出这些数啊!求解

比较器多用来排序

public class TreeMapDemo { public static void main(String[] public class SystemTest { public static void main(String[] a public class Foo { public static void main(String[] args) { public class Test { public static void main(String[] agrs) { public class Test{ public static void main(String args[]){ i java 九九乘法表public class s99{public static void main(String[] public static void main(String[] args) { 求告诉我错在哪里,public class zhishu {public static void main(String 阅读下面的程序,public class Student{public static void main(String class Demo{public static void main (String[]args){int x = 6; 各位前辈们来看看：class monthcounter{ public static void main(String 计算机转换问题class convert {\x05 public static void main(String ar