class return [D@15db9742

Question

我有一个简单的 class 名为 "Trida"

public class Trida {
    public double[] append(double[] pole1, double[] pole2){
        int length = pole1.length + pole2.length;
        double[] pole3 = new double[length];
        for (int i = 0; i < pole1.length; i++){
            pole3[i] = pole1[i];
            pole3[i + 1] = pole2[i];
        }
        return pole3;
    }

public static void main(String[] args) {
        Trida trida = new Trida();

        double[] pole1 = {1.0, 3.0};
        double[] pole2 = {2.0, 4.0};
        System.out.println(trida.append(pole1, pole2));
    }

当我运行此代码时，终端显示 [D@15db9742，但我想要这样的打印字段 - [1.0, 2.0, 3.0, 4.0] 你能帮助我吗？

Answer 1

Arrays.toString(trida.append(pole1, pole2))

也看看here。

In Java, arrays don't override toString(), so if you try to print one directly, you get weird output including the memory location.

class return [D@15db9742

class return [D@15db9742

java

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