Question

这是我到目前为止所做的：

import java.util.*;

public class SArray {

    private int[] array;

    public SArray(int a[]) {
        this.array = a;
    }

    public String toString() {
        String arrayString = "";
        int i = 0;
        while (i < array.length) {
            arrayString = arrayString + array[i];
            i++;
        }
        return arrayString;
    }

    public static void main(String[] args) {
        SArray tester = new SArray(new int[] { 23, 17, 5, 90, 12, 44, 38, 84,
                77, 3, 66, 55, 1, 19, 37, 88, 8, 97, 25, 50, 75, 61, 49 });
        tester.toString();
    }
}

我查找了如何通过构造函数传递数组，这就是我提出的但是没有值实际进入数组而我想知道为什么？

Answer 1

这些值会进入数组，但您无法使用它们。您可能希望/需要显示值，因此请使用System.out.println

public static void main(String[] args) {
    SArray tester = new SArray(new int[] {23, 17, 5, 90, 12, 44, 38, 84, 77, 3, 66, 55, 1, 19, 37, 88, 8, 97, 25, 50, 75, 61, 49});
    //now you're doing something with the value of toString
    System.out.println(tester);
}

Answer 2

阵列就在那里......看：

public static void main(String[] args) {
        NewClass tester = new NewClass(new int[]{23, 17, 5, 90, 12, 44, 38, 84,
            77, 3, 66, 55, 1, 19, 37, 88, 8, 97, 25, 50, 75, 61, 49});
        for(int i = 0; i < tester.array.length; i++){
            System.out.println(tester.array[i]);
        }
    }

这是输出：

23, 17, 5, 90, 12, 44, 38, 84, 77, 3, 66, 55, 1, 19, 37, 88, 8, 97, 25, 50, 75, 61, 49,

通过构造函数传递数组

2 个答案: