初始化JButton引用类型的2D数组

Question

How to initialize/declare a 2D array of reference type in Java? In particular I want to initialize a 2d array of JButton type (3x3) and then add them to a frame inside the constructor. How do i go about it?

Answer 1

MadProgrammer is correct, but in order to use them, you will need to initialize every JButton individually thereafter.

JButton[][] buttons = new JButton[3][3];
for(int i = 0; i <= 2; i++){
    for(int x = 0; x <= 2; x++){
        buttons[i][x] = new JButton();
    }
}

Answer 2

JButton[][] myButtons = JButton[3][3];

creates the array you need. It declares and initializes the array. If you want to declare and initialize it separately, then you can do it this way:

JButton[][] myButtons;
//...
myButtons = JButton[3][3];