java中Introspector.decapitalize方法的功能是什么呢？

Introspector.decapitalize方法的功能:
     如果字符串的第二个字符非大写，则将字符串的第一个字符转换为小写
	 并返回转换后的字符

Introspector.decapitalize方法的源码

public static String decapitalize(String name) {
        if (name == null || name.length() == 0) {
            return name;
        }
        if (name.length() > 1 && Character.isUpperCase(name.charAt(1)) &&
                        Character.isUpperCase(name.charAt(0))){
            return name;
        }
        char[] chars = name.toCharArray();
        chars[0] = Character.toLowerCase(chars[0]);
        return new String(chars);
    }

package com.java265;

import java.beans.Introspector;
public class TestClass {

	public static void main(String[] args) {
		String str1 = "UserInfoClass";
		String str2 = "UUserInfoClass";
		String str3 = "userInfoClass";
		String str4 = "uTserInfoClass";

		System.out.println(Introspector.decapitalize(str1));
		System.out.println(Introspector.decapitalize(str2));
		System.out.println(Introspector.decapitalize(str3));
		System.out.println(Introspector.decapitalize(str4));
	}
}

------运行以上代码,将输出以下信息-----
userInfoClass
UUserInfoClass
userInfoClass
uTserInfoClass