Java二维数组初始化

错误❌的方法:

1. 
String[] A = new String[7]{"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

2. 
private int[][] m = new int[2][13]{
    {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
    {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
};

array creation with both dimension expression and initialization is illegal: ...

也就是，要么new int[][] ...之后赋值；要么直接赋值。

正确✅的方法:

private int[][] m = {
    {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
    {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
};

String[] A = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};