Question

我试图创建一个带有字符串和整数的（2）2d数组，以便以后能够在代码中对它们进行排序。这是我的代码到目前为止，我在尝试编译时不断出错，我不知道该怎么做：

public class SchoolBus {

    public static void main(String[] args) {
        Student[][] students = new Student[6][3];
        students[0][0] = "Mabel";
        students[0][1] = new int[1];
        students[0][2] = new Integer(2);
        students[1][0] = "Dipper";
        students[1][1] = new Integer(1);
        students[1][2] = new Integer(4);
        students[2][0] = "Sam";
        students[2][1] = new Integer(1);
        students[2][2] = new Integer(7);
        students[3][0] = "Ian";
        students[3][1] = new Integer(2);
        students[3][2] = new Integer(3);
        students[4][0] = "Jordan";
        students[4][1] = new Integer(2);
        students[4][2] = new Integer(6);
        students[5][0] = "Steven";
        students[5][1] = new Integer(2);
        students[5][2] = new Integer(9);
        System.out.println(student);
    }
}

Answer 1

对于其他数据结构，请考虑使用例如List之类的Collection。集合允许您轻松排序。

以下是一个例子：

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Objects;

public final class SchoolBus {
    private SchoolBus() {

    }

    public static void main(final String[] args) {
        final List<Student> students = new ArrayList<>();

        students.add(new Student("Mabel", 1, 2));
        students.add(new Student("Dipper", 1, 4));
        students.add(new Student("Sam", 1, 7));
        students.add(new Student("Ian", 2, 3));
        students.add(new Student("Jordan", 2, 6));
        students.add(new Student("Steven", 2, 9));

        System.out.println(students);

        Collections.sort(students, SchoolBus::compare);

        System.out.println(students);
    }

    public static int compare(final Student a, final Student b) {
        return a.getName().compareTo(b.getName());
    }

    private static final class Student {
        private final int a;
        private final int b;
        private final String name;

        public Student(final String name, final int a, final int b) {
            this.name = Objects.requireNonNull(name, "name == null");
            this.a = a;
            this.b = b;
        }

        public int getA() {
            return this.a;
        }

        public int getB() {
            return this.b;
        }

        public String getName() {
            return this.name;
        }

        @Override
        public String toString() {
            return String.format("Student: [Name=%s], [A=%s], [B=%s]", this.name, Integer.toString(this.a), Integer.toString(this.b));
        }
    }
}

如何创建一个6乘3的2d数组，可以保存字符串和整数

1 个答案: