НЛ Лаб5 Зад1

import java.util.LinkedList;
import java.util.Scanner;

class SuperString{
    LinkedList<String> list;

    public SuperString(){
        list = new LinkedList<String>();
    }

    public void append(String s){
        list.add(s);
    }

    public void insert(String s){
        list.addFirst(s);
    }

    public boolean contains(String s){
        String sega = "";
        for(int i=0;i<list.size();i++){
            sega += list.get(i);
        }
        if(sega.contains(s)) return true;
        return false;
    }

    public String toString(){
        String sega = "";
        for(int i=0;i<list.size();i++){
            sega += list.get(i);
        }
        return sega;
    }

    public void removeLast(int k){
        if((k<10)&&(k<=list.size())){
            for(int i = 0; i<k; i++){
                list.removeLast();
            }
        }
    }

    public void reverse(){
        LinkedList<String> tmp = new LinkedList<String>();
        for(int i=list.size()-1;i>=0;i--){
            tmp.add(revercePodstring(list.get(i)));
        }
        list = tmp;
    }

    public String revercePodstring(String s){
        String nov = "";
        for(int i=s.length()-1;i>=0;i--){
            nov+= s.charAt(i);
        }
        return nov;
    }

}

public class SuperStringTest {
    public static void main(String[] args) {
        Scanner jin = new Scanner(System.in);
        int k = jin.nextInt();
        if (  k == 0 ) {
            SuperString s = new SuperString();
            while ( true ) {
                int command = jin.nextInt();
                if ( command == 0 ) {//append(String s)
                    s.append(jin.next());
                }
                if ( command == 1 ) {//insert(String s)
                    s.insert(jin.next());
                }
                if ( command == 2 ) {//contains(String s)
                    System.out.println(s.contains(jin.next()));
                }
                if ( command == 3 ) {//reverse()
                    s.reverse();
                }
                if ( command == 4 ) {//toString()
                    System.out.println(s);
                }
                if ( command == 5 ) {//removeLast(int k)
                    s.removeLast(jin.nextInt());
                }
                if ( command == 6 ) {//end
                    break;
                }
            }
        }}
}