Preview:
public class PJJJeden {
    public static void main(String[] args) {
        int[][] tab = {{1, 0, 0, 0, 0}, {0, 1, 0, 0}, {0, 0, 1}};
        int ile = 0;
        for (int i = 0; i < tab.length; i++)
            ile += tab[i].length; //to to samo co inaczej ile=ile+tab[i].length
        
        int[] tab2 = new int[ile];
        ile = 0;
        for (int i = 0; i < tab.length; i++) {
            for (int j = 0; j < tab[i].length; j++) {
                tab2[ile] = tab[i][j];
                ile++;
            }
        }

        for (int i = 0; i < tab2.length; i++) {
            System.out.println(tab2[i]);
        }
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