public static void main(String[] args) { String word="天地玄黃宇宙洪荒" + "日月盈昃辰宿列張" + "寒來暑往秋收冬藏" + "閏余成歲律呂調陽" + "雲騰致雨露結為霜" + "金生麗水玉出昆岡" + "劍號巨闕珠稱夜光" + "果珍李柰菜重芥姜" + "海咸河淡鱗潛羽翔" + "龍師火帝鳥官人皇" + "始制文字乃服衣裳" + "推位讓國有虞陶唐" + "吊民伐罪周發殷湯" + "坐朝問道垂拱平章" + "愛育黎首臣伏戎羌" + "遐邇一體率賓歸王" + "鳴鳳在竹白駒食場" + "化被草木賴及萬方" + "蓋此身發四大五常" + "恭惟鞠養豈敢毀傷" + "女慕貞潔男效才良" + "知過必改得能莫忘" + "罔談彼短靡恃己長" + "信使可覆器欲難量" + "墨悲絲染詩贊羔羊" + "景行維賢克念作聖" + "德建名立形端表正" + "空谷傳聲虛堂習聽" + "禍因惡積福緣善慶" + "尺璧非寶寸陰是競" + "資父事君曰嚴與敬" + "孝當竭力忠則盡命" + "臨深履薄夙興溫凊" + "似蘭斯馨如松之盛" + "川流不息淵澄取映" + "容止若思言辭安定" + "篤初誠美慎終宜令" + "榮業所基籍甚無竟" + "學優登仕攝職從政" + "存以甘棠去而益詠" + "樂殊貴賤禮別尊卑" + "上和下睦夫唱婦隨" + "外受傅訓入奉母儀" + "諸姑伯叔猶子比兒" + "孔懷兄弟同氣連枝" + "交友投分切磨箴規" + "仁慈隱惻造次弗離" + "節義廉退顛沛匪虧" + "性靜情逸心動神疲" + "守真志滿逐物意移" + "堅持雅操好爵自縻" + "都邑華夏東西二京" + "背邙面洛浮渭據涇" + "宮殿盤郁樓觀飛驚" + "圖寫禽獸畫彩仙靈" + "丙舍旁啟甲帳對楹" + "肆筵設席鼓瑟吹笙" + "升階納陛弁轉疑星" + "右通廣內左達承明" + "既集墳典亦聚群英" + "杜稿鍾隸漆書壁經" + "府羅將相路俠槐卿" + "戶封八縣家給千兵" + "高冠陪輦驅轂振纓" + "世祿侈富車駕肥輕" + "策功茂實勒碑刻銘" + "盤溪伊尹佐時阿衡" + "奄宅曲阜微旦孰營" + "桓公匡合濟弱扶傾" + "綺回漢惠說感武丁" + "俊義密勿多士實寧" + "晉楚更霸趙魏困橫" + "假途滅虢踐土會盟" + "何遵約法韓弊煩刑" + "起翦頗牧用軍最精" + "宣威沙漠馳譽丹青" + "九州禹跡百郡秦並" + "岳宗泰岱禪主雲亭" + "雁門紫塞雞田赤誠" + "昆池碣石鉅野洞庭" + "曠遠綿邈岩岫杳冥" + "治本於農務茲稼穡" + "俶載南畝我藝黍稷" + "稅熟貢新勸賞黜陟" + "孟軻敦素史魚秉直" + "庶幾中庸勞謙謹敕" + "聆音察理鑒貌辨色" + "貽厥嘉猷勉其祗植" + "省躬譏誡寵增抗極" + "殆辱近恥林皋幸即" + "兩疏見機解組誰逼" + "索居閑處沉默寂寥" + "求古尋論散慮逍遙" + "欣奏累遣戚謝歡招" + "渠荷的歷園莽抽條" + "枇杷晚翠梧桐蚤凋" + "陳根委翳落葉飄搖" + "游鵾獨運凌摩絳霄" + "耽讀玩市寓目囊箱" + "易輶攸畏屬耳垣牆" + "具膳餐飯適口充腸" + "飽飫烹宰飢厭糟糠" + "親戚故舊老少異糧" + "妾御績紡侍巾帷房" + "紈扇圓潔銀燭煒煌" + "晝眠夕寐藍筍象床" + "弦歌酒宴接杯舉殤" + "矯手頓足悅豫且康" + "嫡后嗣續祭祀烝嘗" + "稽顙再拜悚懼恐惶" + "箋牒簡要顧答審詳" + "骸垢想浴執熱願涼" + "驢騾犢特駭躍超驤" + "誅斬賊盜捕獲叛亡" + "布射僚丸嵇琴阮簫" + "恬筆倫紙鈞巧任釣" + "釋紛利俗並皆佳妙" + "毛施淑姿工顰妍笑" + "年矢每催曦暉朗曜" + "璇璣懸斡晦魄環照" + "指薪修祜永綏吉劭" + "矩步引領俯仰廊廟" + "束帶矜庄徘徊瞻眺" + "孤陋寡聞愚蒙等誚" + "謂語助者焉哉乎也" ; char[] ch1 = word.toCharArray(); List<Character> list = new ArrayList<>(); for(char ch : ch1) { if (list.contains(ch)) { System.out.println(ch); list.clear(); } list.add(ch); //System.out.println(ch); } System.out.println(ch1.length); }