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program java

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package proiect1;import java.util.Scanner;public class program {public static void main(String[] args) {Scanner introducere = new Scanner(System.in);System.out.println("introduceti sirul de caractere:");String sir = introducere.nextLine();System.out.println("meniu");System.out.println("1.Sa se aiseze lungimea sirului de caractere");System.out.println("2.Sa se returneze ultima pozitie pe care se intalneste caracterul 'a' ");System.out.println("3.De cate ori apare secventa 'abc'");System.out.println("4.Sa se verifice daca sirul de caractere este palindrom");System.out.println("5.sa se sterga toate caracterele de pe pozitie para");System.out.println("Alegeti o optiune");int optiune = introducere.nextInt();switch(optiune) { case 1: System.out.println(lungimea(sir)); break; case 2:System.out.println( ultpoz(sir));break; case 3: System.out.println( aparitie(sir));break; case 4: System.out.println(palindrom(sir));break; case 5: System.out.println( textnou(sir));break; default: System.out.println("Optiune nepermisa."); }}public static int lungimea(String text) { return text.length(); } public static int ultpoz(String text) { int poz=0; for(int i=0;i