java - 如何将 arraylist 与数组一起使用？

Question

我让它遍历一个数组并从数组列表中为其赋值。我在尝试编写一个可以查看数组列表名称中的设置值是否有足够的行和列的东西时遇到了麻烦。每次打印时，它都只打印为一行，而不是打印为带有相应数字的行和列。我不知道我做错了什么。

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Scanner;

class SeatingChart {
    public static void main(String[] args) {
        // instanced variables
        Scanner kb = new Scanner(System.in);
        String name = "";
        int r = 0;
        int c = 0;
        int k = 0;
        String row = "";
        String column = "";
        ArrayList<String> names = new ArrayList<String>();
        while (!name.equals("quit")) {
            System.out.print("Enter first name of student: ");
            // takes the name of kb and sets it to name
            name = kb.nextLine();
            // if the ArrayList names isEmpty then it adds the value at index
            if (names.isEmpty()) {
                names.add(name);
            } else if (name.compareTo(names.get(names.size() - 1)) > 0) {
                names.add(name);
            } else {
                // for loop going through the list of names to insert where it belongs
                for (int i = 0; i < names.size(); i++) {
                    if (name.compareTo(names.get(i)) < 0) {
                        names.add(i, name);
                        i = names.size();
                    }
                }
            }
            if (names.contains("quit")) {
                names.remove("quit");
            }
        }
        System.out.println(names);
        // System.out.println(names);
        System.out.println("how many rows do you have: ");
        r = kb.nextInt();
        System.out.println();
        System.out.println("how many columns do you have: ");
        c = kb.nextInt();
        System.out.println();
        System.out.println("Should students be seated row major(1) or column major(0)?");
        if (kb.nextInt() == 1) {
            // String arr[] = new String[names.size()];
            String[][] chart = new String[r][c];
            for (int i = 0; i < chart.length; i++) {
                for (int j = 0; j < chart[0].length; j++) {
                    if (k < names.size()) {
                        chart[i][j] = names.get(k);
                        k += 1;
                    }
                    System.out.printf("%10s ", chart[i][j]);
                }
            }

        } else if (kb.nextInt() == 2) {
            String arr[] = new String[names.size()];
            String[][] chart = new String[r][c];
            for (int i = 0; i < names.size(); i++) {
                arr[i] = names.get(i);
            }
            System.out.println(Arrays.toString(arr));
            for (int i = 0; i < r; i++) {
                for (int j = 0; j < c; j++) {
                    arr[i] = chart[r][c];
                    k++;
                }
            }
            for (int i = 0; i < chart[0].length; i++) {
                for (int j = 0; j < chart.length; j++) {
                    System.out.printf("%10s ", chart[i][j]);
                }
            }
            System.out.println("Column order!");
        }
    }
}

Answer 1

我已经修复了一个主要的IF block

    if (kb.nextInt() == 1) {
        // String arr[] = new String[names.size()];
        String[][] chart = new String[r][c];
        for (int i = 0; i < chart.length; i++) {
            for (int j = 0; j < chart[0].length; j++) {
                if (k < names.size()) {
                    chart[i][j] = names.get(k);
                    k += 1;
                }
                System.out.printf("%10s ", chart[i][j]);
            }
            System.out.println(""); // ADD THIS
        }

    }