Java 获取树映射

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//package com.nowjava;//from n o w    j a v a  . c o m

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import java.util.Comparator;

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import java.util.TreeMap;

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public class Main {

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    public static void main(String[] argv) throws Exception {

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        System.out.println(getTreeMap());

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    }

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    public static TreeMap<Object, Object> getTreeMap() {

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        return new TreeMap<Object, Object>(getComparator());

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    }/* 来自 NowJava.com - 时  代  Java*/

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    private static Comparator<Object> getComparator() {

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        return new Comparator<Object>() {

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            @SuppressWarnings("unchecked")

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            @Override

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            public int compare(final Object o1, final Object o2) {

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                final Comparable<Object> c1 = (Comparable<Object>) o1;

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                final Comparable<Object> c2 = (Comparable<Object>) o2;

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                if (o1.getClass().equals(o2.getClass())) {

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                    return c1.compareTo(c2);

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                } else {

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