Przejdź do głównej zawartości

String-2 > repeatFront

Given a string and an int n, return a string made of the first n characters of the string, followed by the first n-1 characters of the string, and so on. You may assume that n is between 0 and the length of the string, inclusive (i.e. n >= 0 and n <= str.length()).

repeatFront("Chocolate", 4) → "ChocChoChC"
repeatFront("Chocolate", 3) → "ChoChC"
repeatFront("Ice Cream", 2) → "IcI"

Definiujemy zmienna newStr , loop reverse schodzimy od n do 0 i kazdy substring dodajemy do nwoego newStr



public String repeatFront(String str, int n) {
  String newStr = "";
  for (int i=n; i>=0; i--){
    newStr+=str.substring(0,i);
  }return newStr;
}
Etykiety:

Komentarze

Prześlij komentarz

Popularne posty z tego bloga

Stored Procedures - JDBC Java SQL

Stored Procedures: group of SQL statements that perform a particular task  Normally created by DBA Can have any combination of input, output, and input/output parameters Benefits: Performance  - compiled once but executable more times Productivity and Ease of Use  - avoid redundant code, extend SQL Database functionality  Scalability   Maintainability Interoperability Replication Security To call stored procedure from Java The JDBC API provides the CallableStatement CallableStatement myCall = myConn.prepareCall("{ call some_stored_procedure() }"); ... myCall.execute(); JDBC API parameter types IN default INOUT OUT Stored Procedure can return result sets EXAMPLE: Created stored procedure on MySQL side - NAME:  increase_salaries_for_department DELIMITER $$ DROP PROCEDURE IF EXISTS ` increase_salaries_for_department `$$ CREATE DEFINER=`student`@`localhost` PROCEDURE `increase_salaries_for_departme...
Prześlij komentarz
Czytaj więcej

Java - variables , data types

Data Types Data types in Java are classified in to types: Primitive - which include Integer, Character, Boolean and Floating Point Non-primitive - which includes Classes, Interfaces and Arrays Integer : byte 1 byte short 2 bytes int 4 bytes long 8 bytes Floating Point : number + fractional parts  float double Character : stores character Boolean : hold true false value Variables  Instance Variables (non-Static Fields) -  Objects store their individual states in “non-static fields”, that is, fields declared without the static keyword. Class Variables - Static Fields - any field with static modifier says that there is only one copy of this variable in existence static int myClassVariable = 6;  Local Variables - a method stores it's temporary state of local variables int count=0; Parameters - variables which will be passed to the methods of a class
Prześlij komentarz
Czytaj więcej

Inserting Data into SQL Database with Java

Inserting Data into SQL Database with Java Java Documentation - Processing SQL statements with JDBC  Process: Get connection to database Create a statement Execute SQL query import java.sql.*; /**  *  * @author www.luv2code.com  *  */ public class JdbcTest { public static void main(String[] args) throws SQLException { Connection myConn = null; Statement myStmt = null; ResultSet myRs = null; String dbUrl = "jdbc:mysql://localhost:3306/demo ?autoReconnect=true&useSSL=false "; String user = "root"; String pass = "Sasanka01"; try { // 1. Get a connection to database myConn = DriverManager.getConnection(dbUrl, user, pass); System.out.println("Database connection successfully created"); // 2. Create a statement myStmt = myConn.createStatement(); int rowsAffected = myStmt.executeUpdate(                          "...
Prześlij komentarz
Czytaj więcej