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Hutool是一个小而全的Java工具类库，通过静态方法封装，降低相关API的学习成本，提高工作效率，使Java拥有函数式语言般的优雅，让Java语言也可以“甜甜的”。

There is a newer version: 5.8.34

package cn.hutool.core.map;

import java.util.Comparator;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;

/**
 * 忽略大小写的{@link TreeMap}

 * 对KEY忽略大小写，get("Value")和get("value")获得的值相同，put进入的值也会被覆盖
 *
 * @author Looly
 *
 * @param  键类型
 * @param  值类型
 * @since 3.3.1
 */
public class CaseInsensitiveTreeMap extends CaseInsensitiveMap {
	private static final long serialVersionUID = 4043263744224569870L;

	// ------------------------------------------------------------------------- Constructor start
	/**
	 * 构造
	 */
	public CaseInsensitiveTreeMap() {
		this((Comparator) null);
	}

	/**
	 * 构造
	 *
	 * @param m Map
	 * @since 3.1.2
	 */
	public CaseInsensitiveTreeMap(Map m) {
		this();
		this.putAll(m);
	}

	/**
	 * 构造
	 *
	 * @param m Map，初始Map，键值对会被复制到新的TreeMap中
	 * @since 3.1.2
	 */
	public CaseInsensitiveTreeMap(SortedMap m) {
		super(new TreeMap(m));
	}

	/**
	 * 构造
	 *
	 * @param comparator 比较器，{@code null}表示使用默认比较器
	 */
	public CaseInsensitiveTreeMap(Comparator comparator) {
		super(new TreeMap<>(comparator));
	}
	// ------------------------------------------------------------------------- Constructor end
}