java converted into Chinese pinyin tools

package com.app.util;

import net.sourceforge.pinyin4j.PinyinHelper;
import net.sourceforge.pinyin4j.format.HanyuPinyinCaseType;
import net.sourceforge.pinyin4j.format.HanyuPinyinOutputFormat;
import net.sourceforge.pinyin4j.format.HanyuPinyinToneType;
import net.sourceforge.pinyin4j.format.exception.BadHanyuPinyinOutputFormatCombination;

/**
 * @ClassName:  ChineseToPinYinUtil   
 * @Description:TODO(中文转化成拼音工具类)   
 * @author: wd
 * @date:  2019年12月9日  下午5:10:52
 */
public class ChineseToPinYinUtil {

    public static void main(String[] args) {
        // 中文字符串首字母大写
        System.out.println("东哥（中文字符串首字母大写）:" + toFirstCharUpCase("东哥"));
        // 中文字符串首字母小写
        System.out.println("东哥（中文字符串首字母小写）:" + toFirstCharLowCase("东哥"));
        // 中文字符串拼音大写
        System.out.println("东哥（中文字符串拼音大写）:" + toPinyinUpCase("东哥"));
        // 中文字符串拼音小写
        System.out.println("东哥（中文字符串拼音小写）:" + toPinyinLowCase("东哥"));
    }

    /**
     * 获取中文字符串相应的拼音首字母小写
     */
    public static String toFirstCharLowCase(String chinese) {
        if (null == chinese) {
            return null;
        }
        String pinyinStr = "";
        // 将字符串转为字符数组
        char[] newChar = chinese.toCharArray();
        HanyuPinyinOutputFormat defaultFormat = new HanyuPinyinOutputFormat();
        // 设置小写
        defaultFormat.setCaseType(HanyuPinyinCaseType.LOWERCASE);
        defaultFormat.setToneType(HanyuPinyinToneType.WITHOUT_TONE);
        for (int i = 0; i < newChar.length; i++) {
            if (newChar[i] > 128) {
                try {
                    pinyinStr += PinyinHelper.toHanyuPinyinStringArray(newChar[i], defaultFormat)[0].charAt(0);
                } catch (BadHanyuPinyinOutputFormatCombination e) {
                    e.printStackTrace();
                }
            } else {
                pinyinStr += newChar[i];
            }
        }
        return pinyinStr;
    }

    /**
     * 获取中文字符串相应的拼音首字母大写
     */
    public static String toFirstCharUpCase(String chinese) {
        if (null == chinese) {
            return null;
        }
        String pinyinStr = "";
        // 将字符串转为字符数组
        char[] newChar = chinese.toCharArray();
        HanyuPinyinOutputFormat defaultFormat = new HanyuPinyinOutputFormat();
        // 设置大写
        defaultFormat.setCaseType(HanyuPinyinCaseType.UPPERCASE);
        defaultFormat.setToneType(HanyuPinyinToneType.WITHOUT_TONE);
        for (int i = 0; i < newChar.length; i++) {
            if (newChar[i] > 128) {
                try {
                    pinyinStr += PinyinHelper.toHanyuPinyinStringArray(newChar[i], defaultFormat)[0].charAt(0);
                } catch (BadHanyuPinyinOutputFormatCombination e) {
                    e.printStackTrace();
                }
            } else {
                pinyinStr += newChar[i];
            }
        }
        return pinyinStr;
    }

    /**
     * 将中文字符串转换成拼音小写
     */
    public static String toPinyinLowCase(String chinese) {
        if (null == chinese) {
            return null;
        }
        String pinyinStr = "";
        // 将字符串转为字符数组
        char[] newChar = chinese.toCharArray();
        HanyuPinyinOutputFormat defaultFormat = new HanyuPinyinOutputFormat();
        // 设置小写
        defaultFormat.setCaseType(HanyuPinyinCaseType.LOWERCASE);
        defaultFormat.setToneType(HanyuPinyinToneType.WITHOUT_TONE);
        for (int i = 0; i < newChar.length; i++) {
            if (newChar[i] > 128) {
                try {
                    pinyinStr += PinyinHelper.toHanyuPinyinStringArray(newChar[i], defaultFormat)[0];
                } catch (BadHanyuPinyinOutputFormatCombination e) {
                    e.printStackTrace();
                }
            } else {
                pinyinStr += newChar[i];
            }
        }
        return pinyinStr;
    }

    /**
     * 将中文字符串转换成拼音大写
     */
    public static String toPinyinUpCase(String chinese) {
        if (null == chinese) {
            return null;
        }
        String pinyinStr = "";
        // 将字符串转为字符数组
        char[] newChar = chinese.toCharArray();
        HanyuPinyinOutputFormat defaultFormat = new HanyuPinyinOutputFormat();
        // 设置大写
        defaultFormat.setCaseType(HanyuPinyinCaseType.UPPERCASE);
        defaultFormat.setToneType(HanyuPinyinToneType.WITHOUT_TONE);
        for (int i = 0; i < newChar.length; i++) {
            if (newChar[i] > 128) {
                try {
                    pinyinStr += PinyinHelper.toHanyuPinyinStringArray(newChar[i], defaultFormat)[0];
                } catch (BadHanyuPinyinOutputFormatCombination e) {
                    e.printStackTrace();
                }
            } else {
                pinyinStr += newChar[i];
            }
        }
        return pinyinStr;
    }
}