public static void main(String[] args) { String word="天地玄黄宇宙洪荒" + "日月盈昃辰宿列张" + "寒来暑往秋收冬藏" + "闰余成岁律吕调阳" + "云腾致雨露结为霜" + "金生丽水玉出昆冈" + "剑号巨阙珠称夜光" + "果珍李柰菜重芥姜" + "海咸河淡鳞潜羽翔" + "龙师火帝鸟官人皇" + "始制文字乃服衣裳" + "推位让国有虞陶唐" + "吊民伐罪周发殷汤" + "坐朝问道垂拱平章" + "爱育黎首臣伏戎羌" + "遐迩一体率宾归王" + "鸣凤在竹白驹食场" + "化被草木赖及万方" + "盖此身发四大五常" + "恭惟鞠养岂敢毁伤" + "女慕贞洁男效才良" + "知过必改得能莫忘" + "罔谈彼短靡恃己长" + "信使可覆器欲难量" + "墨悲丝染诗赞羔羊" + "景行维贤克念作圣" + "德建名立形端表正" + "空谷传声虚堂习听" + "祸因恶积福缘善庆" + "尺璧非宝寸阴是竞" + "资父事君曰严与敬" + "孝当竭力忠则尽命" + "临深履薄夙兴温凊" + "似兰斯馨如松之盛" + "川流不息渊澄取映" + "容止若思言辞安定" + "笃初诚美慎终宜令" + "荣业所基籍甚无竟" + "学优登仕摄职从政" + "存以甘棠去而益咏" + "乐殊贵贱礼别尊卑" + "上和下睦夫唱妇随" + "外受傅训入奉母仪" + "诸姑伯叔犹子比儿" + "孔怀兄弟同气连枝" + "交友投分切磨箴规" + "仁慈隐恻造次弗离" + "节义廉退颠沛匪亏" + "性静情逸心动神疲" + "守真志满逐物意移" + "坚持雅操好爵自縻" + "都邑华夏东西二京" + "背邙面洛浮渭据泾" + "宫殿盘郁楼观飞惊" + "图写禽兽画彩仙灵" + "丙舍旁启甲帐对楹" + "肆筵设席鼓瑟吹笙" + "升阶纳陛弁转疑星" + "右通广内左达承明" + "既集坟典亦聚群英" + "杜稿钟隶漆书壁经" + "府罗将相路侠槐卿" + "户封八县家给千兵" + "高冠陪辇驱毂振缨" + "世禄侈富车驾肥轻" + "策功茂实勒碑刻铭" + "盘溪伊尹佐时阿衡" + "奄宅曲阜微旦孰营" + "桓公匡合济弱扶倾" + "绮回汉惠说感武丁" + "俊义密勿多士实宁" + "晋楚更霸赵魏困横" + "假途灭虢践土会盟" + "何遵约法韩弊烦刑" + "起翦颇牧用军最精" + "宣威沙漠驰誉丹青" + "九州禹迹百郡秦并" + "岳宗泰岱禅主云亭" + "雁门紫塞鸡田赤诚" + "昆池碣石钜野洞庭" + "旷远绵邈岩岫杳冥" + "治本于农务兹稼穑" + "俶载南亩我艺黍稷" + "税熟贡新劝赏黜陟" + "孟轲敦素史鱼秉直" + "庶几中庸劳谦谨敕" + "聆音察理鉴貌辨色" + "贻厥嘉猷勉其祗植" + "省躬讥诫宠增抗极" + "殆辱近耻林皋幸即" + "两疏见机解组谁逼" + "索居闲处沉默寂寥" + "求古寻论散虑逍遥" + "欣奏累遣戚谢欢招" + "渠荷的历园莽抽条" + "枇杷晚翠梧桐蚤凋" + "陈根委翳落叶飘摇" + "游鹍独运凌摩绛霄" + "耽读玩市寓目囊箱" + "易輶攸畏属耳垣墙" + "具膳餐饭适口充肠" + "饱饫烹宰饥厌糟糠" + "亲戚故旧老少异粮" + "妾御绩纺侍巾帷房" + "纨扇圆洁银烛炜煌" + "昼眠夕寐蓝笋象床" + "弦歌酒宴接杯举殇" + "矫手顿足悦豫且康" + "嫡后嗣续祭祀烝尝" + "稽颡再拜悚惧恐惶" + "笺牒简要顾答审详" + "骸垢想浴执热愿凉" + "驴骡犊特骇跃超骧" + "诛斩贼盗捕获叛亡" + "布射僚丸嵇琴阮箫" + "恬笔伦纸钧巧任钓" + "释纷利俗并皆佳妙" + "毛施淑姿工颦妍笑" + "年矢每催曦晖朗曜" + "璇玑悬斡晦魄环照" + "指薪修祜永绥吉劭" + "矩步引领俯仰廊庙" + "束带矜庄徘徊瞻眺" + "孤陋寡闻愚蒙等诮" + "谓语助者焉哉乎也" ; 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); }