package A14;

public class BigAndSmall extends Dekorierer {
    BigAndSmall(ChConv c){
        super (c);
    }
    @Override
    char fetch() {
        char c = ch.fetch();
        if(c>='A'&&c<='Z')return (char)(c+'a'-'A');
        else if(c>='a'&&c<='z')return (char) (c+'A'-'a');
        else return c;
    }
}
package A14;

abstract class ChConv {
    abstract char fetch();
}
package A14;

public class ConstString extends ChConv{
    String text = "keep cool";
    int x = 0;
    char fetch(){
        if(x<text.length()){
            return text.charAt(x++);
        }
        return ' ';
    }
}
package A14;

abstract class Dekorierer extends ChConv{
    ChConv ch;
    Dekorierer(ChConv c){
        ch = c;
    }
}
package A14;

public class MainA14 {
    public static void main(String args[]){
        ChConv c = new BigAndSmall(new ParaString("Hallo"));
        for(int i = 0; i<15; i++)System.out.println(c.fetch());
    }
}
package A14;

public class ParaString extends ChConv {
    ParaString(String s){
        text = s;
    }
    String text;
    int x = 0;
    char fetch(){
        if(x<text.length()){
            return text.charAt(x++);
        }
        return ' ';
    }
}