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This exercise is already available in your IntelliJ as a project. What you need to do is described in the comments at the top of the file in src/main/java/.

package basics;

public class CommonElements {
    /**
     *
     * @param tab1 is a non null array
     * @param tab2 is a non null array
     * @return the number of elements that are the same at the same index
     *         more exactly the size of set {i such that tab1[i] == tab2[i]}
     *         for instance count([1,3,5,5],[1,2,5,5,6]) = 3
     */
    public static int count(int [] tab1, int [] tab2) {
         return -1;
    }

    /**
     *
     * @param tab1 is a non null 2D array
     * @param tab2 is a non null 2D array
     * @return the number of elements that are the same at the same index
     *         more exactly the size of set {(i,j) such that tab1[i][j] == tab2[i][j]}
     */
    public static int count(int [][] tab1, int [][] tab2) {
         return -1;
    }
}