YOU SAID:

public boolean shareDigit(int a, int b) { if(a%10==b%10||a%10==b/10||a/10==b%10||a/10==b/10){ return true; }else{ return false; } }

INTO JAPANESE

public boolean shareDigit（int a、int b）{if（a％10 == b％10 || a％10 == b / 10 || a / 10 == b％10 || a / 10 == b / 10）{trueを返す; } else {return false; }}

BACK INTO ENGLISH

public boolean shareDigit (int a, int b) {if (a% 10 == b% 10 || a% 10 == b / 10 || a / 10 == b% 10 || a / 10 == b / 10) {return true;} else {return false;}}

INTO JAPANESE

public boolean shareDigit（int a、int b）{if（a％10 == b％10 || a％10 == b / 10 || a / 10 == b％10 || a / 10 == b / 10）{trueを返す;} else {falseを返す;}}

BACK INTO ENGLISH

public boolean shareDigit (int a, int b) {if (a% 10 == b% 10 || a% 10 == b / 10 || a / 10 == b% 10 || a / 10 == b / 10) {return true;} else {return false;}}