Finding minimum and maximum in Java 2D array

I have been trying to figure this out for a while and need some help. I need to find the min/max values and print them out for a multidimensional array. Here are the two ways that I have tried.

import java.util.*;

class MinMax {
    public static void main(String[] args) {
        int[][] data = {{3, 2, 5},
                {1, 4, 4, 8, 13},
                {9, 1, 0, 2},
                {0, 2, 6, 3, -1, -8}};
        Arrays.sort(data);
        System.out.println("Minimum = " + data[0]);
        System.out.println("Maximum = " + data[data.length - 1]);
    }
}

This version complies but doesn't run.

import java.util.*;

class MinMax {
    public static void main(String[] args) {
        int[][] data = {{3, 2, 5},
                {1, 4, 4, 8, 13},
                {9, 1, 0, 2},
                {0, 2, 6, 3, -1, -8}};

    public static int getMaxValue(int[] numbers) {
        int maxValue = numbers[0];
        for (int i = 1; i < numbers.length; i++) {
            if (numbers[i] > maxValue) {
                maxValue = numbers[i];
            }
            return maxValue;
            {
                public static int getMinValue (int[] numbers) {
                    int minValue = numbers[0];
                    for (int i = 1; i < numbers.length; i++) {
                        if (numbers[i] < minValue) {
                            minValue = numbers[i];
                        }
                    }
                return minValue;
            }

This version just throws me a bunch of errors in compiling. Any help is greatly appreciated.

Ok, I've kinda fixed your code. Actually your mistake was that you have not been traversing all the cells of your multidimensional array.

So, I've added additional loop into getMinValue/getMinValue methods and fixed array elements addressing.

import java.util.*;

class MinMax {
    public static void main(String[] args) {
        int[][] data = {
                {3, 2, 5},
                {1, 4, 4, 8, 13},
                {9, 1, 0, 2},
                {0, 2, 6, 3, -1, -8}
        };
        System.out.println(getMaxValue(data));
        System.out.println(getMinValue(data));
    }


    public static int getMaxValue(int[][] numbers) {
        int maxValue = numbers[0][0];
        for (int j = 0; j < numbers.length; j++) {
            for (int i = 0; i < numbers[j].length; i++) {
                if (numbers[j][i] > maxValue) {
                    maxValue = numbers[j][i];
                }
            }
        }
        return maxValue;
    }

    public static int getMinValue(int[][] numbers) {
        int minValue = numbers[0][0];
        for (int j = 0; j < numbers.length; j++) {
            for (int i = 0; i < numbers[j].length; i++) {
                if (numbers[j][i] < minValue ) {
                    minValue = numbers[j][i];
                }
            }
        }
        return minValue ;
    }
}