Question

以下程序交换数组中的两个元素。但它似乎没有运行，但我确信我没有做错任何事。

public class swap {

    public static String[] swap(int first, int second, String[] A) {
        String hold = A[first];
        A[first] = A[second];
        A[second] = hold;
        return A;
    }

    public static void main(String[] args) {
        String[] B = {"Dawn", "Justice", "Of"};
        String[] c = swap.swap(1, 2, B);
        System.out.print(c);
    }
}

Answer 1

1。）需要创建swap class的对象，或者因为static不需要创建对象，只需使用swap(1, 2, B);

2。）打印Arrays.toString(c)

修改后的代码

public static String[] swap(int first, int second, String[] A) {
        String hold = A[first];
        A[first] = A[second];
        A[second] = hold;
        return A;

    }

    public static void main(String[] args) {
        String[] B = { "Dawn", "Justice", "Of" };
        String[] c = swap(1, 2, B);
        System.out.print(Arrays.toString(c));

    }

<强>输出

[Dawn, Of, Justice]

Answer 2

import java.util.Arrays; 公共班级交换{

public static String[] swap(int first, int second, String[] A) {
    String hold = A[first];
    A[first] = A[second];
    A[second] = hold;
    return A;
}

public static void main(String[] args) {
    String[] B = {"Dawn", "Justice", "Of"};
    String[] c = swap.swap(1, 2, B);
    System.out.print(Arrays.toString(c));
}

}

为什么我的Java程序没有运行？

2 个答案: