有這麼一個需求當伺服器返回的資料中包含中文和英文的時候，只顯示把中文顯示出來(只獲取中文內容)。

看程式碼：

public static String checkString(String str) {
    StringBuilder res = new StringBuilder();
    if (str != null) {
        for (int i = 0; i < str.length(); i++) {
            //只要字串中有中文則為中文
if (isChinese(str.charAt(i))) {
                res.append(str.charAt(i));
            }
        }
    }
    return 
 
res.toString();
}

//判斷是不是中文
public static boolean isChinese(char c) {
    Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);
    if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS
|| ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS
|| ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A
 
|| ub == Character.UnicodeBlock.GENERAL_PUNCTUATION
|| ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION
|| ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS) {
        return true;
    }
    return false;
}