How to prevent the value of an array from changing

Question

In my program, I am declaring a static int 2D array and setting it equal to some values. In a different method, I create a local variable and assign it to the 2D array I created. I make some changes to the local variable, however I don't want my initial values in my 2D array to change. The reason I am using static is because I am using a static main method and I figured all other methods and variables had to be static as well.

Here's a simple layout of what I am doing

public static int[][] myArray = {{1,2},{3,4}};

public static void main(String args[]){
    doSomething();
}

public static void doSomething(){
    int[][] newArray = myArray;

    //do Something to newArray

}

I do not want the values of myArray to change is there a way to handle this? Do I have to get rid of a static variable within a static method?

Answer 1

You will have to create deep copy of your array. You can do it manually or use System.arraycopy() to suit your needs.

Answer 2

Arrays are mutable and so you need to use System.arraycopy to make defensive copies. Make the array private and call a public method which hands a copy is the way to prevent mistakes of bugs by sharing a reference when you must not.

Answer 3

深度复制原始数组并保留这两个数组之一（仅更改其中之一）

Answer 4

尝试：

int[][] newArray = Arrays.copyOf(myArray, myArray.length)