html - 为什么这不起作用？我在正确的轨道上吗？

Question

为什么这不起作用？这是我的程序“getTutorNames”方法。完整的问题在链接中。这只是该计划的一部分。有人可以帮忙吗？我已经被困了好几个小时了。例如，我的错误消息之一：PeerTutoringReport.java:30: error: variable nameList is already defined in method getTutorNames() Return nameList; ^

Answer 1

就像我在评论部分所说的那样，该方法存在多个问题

import javax.swing.JOptionPane;
import java.util.ArrayList;

public class PeerTutoringReport {

    public static void main(String[] args) {

        ArrayList<String> tutorNames = getTutorNames();
        // sortTutorNames();
        // getTutorDegree();
        // getAmountOfStudentsForTutors();
        // calculateStipend();
        // displayResults();
    }

    private static boolean isNullorEmpty(String s) {
        return s == null || s.matches("\\s*");
    }

    public static ArrayList<String> getTutorNames() {

        ArrayList<String> nameList = new ArrayList<String>();

        while (nameList.size() < 9) {
            String firstName = JOptionPane
                    .showInputDialog("Enter Tutor First Name: ");
            String lastName = JOptionPane
                    .showInputDialog("Enter Tutor Last Name: ");

            if (isNullorEmpty(firstName) && isNullorEmpty(lastName)) {
                continue;
            }
            nameList.add(lastName + "," + firstName);
        }
        return nameList;

    }
}