java - 为什么编译器禁止数组初始化？

Question

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为什么编译器禁止数组初始化？

class Matrix {
    public int[] arr = null;
}

public class Main {
    public static void main(String[] args) {
        Matrix matrix = new Matrix();
        matrix.arr = {1, 2}; // compile error
        System.out.println(matrix.arr[0]);
    }
}

Answer 1

当你创建一个数组时，你需要做

matrix.arr = new int[]{1,2};