在Java中正确声明int类型的多维数组

Question

I've looked all around stackoverflow, and have found multiple answers to defining a multiple dimensional array in Java. Heck I even looked back some of my older code and found similar examples with doubles, but for some reason when utilizing the code out of those examples as well as my own code, I'm getting errors in both Eclipse and IntelliJ like the following:

The following does not give me the above error:

public class foo
{
    private int[][] bar()
    {
        int[][] test = new int[10][];
        test[0] = new int[100];
        test[1] = new int[500];
    }  
}

The following gives me the above error:

public class foo
{
   int[][] test = new int[10][];
   test[0] = new int[100];
   test[1] = new int[500];
}




Syntax error on token ";", { expected after this token (for the first line)
Syntax error on token(s), misplaced construct(s) (for the second line)

I'm using this to solve problem 28 on Project Euler.

Answer 1

I guess you placed your code directly in a class. You need to put it inside a method of a class, like this:

public class Snippet {
    public static void main(String[] args) {
        int[][] test = new int[10][];
        test[0] = new int[100];
        test[1] = new int[500];
    }
}

Or you could use a static initializer:

public class Snippet {
    static int[][] test = new int[10][];
    static {
        test[0] = new int[100];
        test[1] = new int[500];
    }
}

Answer 2

如果它表示“ {”预期，则您的错误在于此之前的行中。

Answer 3

try these declarations.. I don't know if I got ur point.

int[][] test = new int[][]{
 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
 { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
 };
 //change zeroes with your values

or

int[][] test= new int[3][10];