import java.util.*;

public class convert {

    String finished;
    String[] operatorsToCheckFor = {"+", "/", "-", "*"};
    List<String> list = Arrays.asList(operatorsToCheckFor);

    public void setToConvert(String x)
    {
        if(x.isEmpty())
        {
            finished = "";
        }
        else
        {
            finished = x;
    doConvert();
        }
    }

    private void doConvert()
    {
        //lets see what the string contains
        if(finished.equals(list))
        {
            finished = "true";
        }
        else
        {
            finished = "false";
        }
    }

    public void returnTransformed()
    {
        if(finished.isEmpty())
        {
            System.out.println("There is no data to return. You didn't enter in a line of code to convert.");
        }
        else
        {
            System.out.println(finished);
        }
    }
}