java - Increase string value -

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java question here: if have string "a", how can "add" value string, "b" , on? "a++"

string str = "abcde"; system.out.println(getincrementedstring(str));

output

bcdef

//this code give next char in unicode sequence

public static string getincrementedstring(string str){         stringbuilder sb = new stringbuilder();         for(char c:str.tochararray()){             sb.append(++c);         }         return sb.tostring();     }

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