text: Generate a string whose all K | Java program to generate a string whose substrings of length K concatenates to form given strings ; Function to return the required required string ; Iterate the given string ; Append the first character of every substring of length K ; Consider all characters from the last substring ; Driver code
code: class GFG { public static void decode_String ( String str , int K ) { String ans = " " ; for ( int i = 0 ; i < str . length ( ) ; i += K ) ans += str . charAt ( i ) ; for ( int i = str . length ( ) - ( K - 1 ) ; i < str . length ( ) ; i ++ ) ans += str . charAt ( i ) ; System . out . println ( ans ) ; } public static void main ( String [ ] args ) { int K = 3 ; String str = " abcbcscsesesesd " ; decode_String ( str , K ) ; } }