Boolean Method positive Integers!

I need to make a boolean method that reads a original array and a subarray and determines if it contains any positive integers!

import java.util.*;
import java.util.Random;//for Scanner
public class Assignment4_3 {
  public static final int MIN = -10;
  public static final int MAX = 50;
  public static final int ROW = 15; 
  public static final int COL = 20; 

  public static void main(String[] args) {
    //declarations
    int r, c;
    boolean pos;
    char answer;
    //user input
    Scanner input = new Scanner(System.in);
    
    int[][] a = new int[ROW][COL]; 
    
    randArray(a, ROW, COL, MIN, MAX);
    System.out.println("The original table is: ");
    printArray(a, ROW, COL);
    originalArray(a, ROW, COL);
 
    System.out.println("Do you want to start subarray processing (Y/N)? ");
    answer = input.next().charAt(0);
    while(answer == 'y' || answer == 'Y' ){
      System.out.println("Enter row size: ");
      r=input.nextInt();
      while( r < 0 || r > ROW){
        System.out.println("ERROR! Should be positive and < 15. REENTER: ");
        r=input.nextInt();
      }
      System.out.println("Enter column size: ");
      c=input.nextInt();
      while(c < 0 || c > COL){
        System.out.println("ERROR! Should be positive and < 20. REENTER: ");
        c=input.nextInt();
      }
      
      readArray(a, ROW, COL);
      System.out.println("The subarray is: ");
      printArray(a, r, c);
      pos = allPositive(a, r, c);
      if(pos == true){
        System.out.print("Some elements in the original table are positive. \n");
      }
      else{
        System.out.print("xxxxxxxxx \n");
      }
        
      
      System.out.println("Do you want to continue subarray processing (Y/N)?");
      answer = input.next().charAt(0);
 }
  }
  
public static void randArray(int[][] matrix, int row, int col, int low, int up) { 
    Random rand = new Random(); 
    for (int r = 0; r < row; r++)  
        for (int c = 0; c < col; c++) 
            matrix[r][c] = rand.nextInt(up - low + 1) + low; 
}
public static void readArray(int[][] matrix, int row, int col) { 
    Scanner input = new Scanner(System.in); 
    for (int r = 0; r < r; r++) 
         for (int c = 0; c < c; c++) 
              matrix[r][c] = input.nextInt(); 
}


public static boolean allPositive(int[][] matrix, int row, int col) { 
     
  for (int r = 0; r < matrix.length; r++) 
   for (int c = 0; c < matrix[r].length; c++) 
      matrix[r][c] = r + c;

          if(matrix.length >= 0 && matrix[r].length >= 0){ 
  }
    return true;               
  
 
        


}
  public static void printArray(int[][] matrix, int row, int col) { 
    for (int r = 0; r < row; r++){ 
        for (int c = 0; c < col; c++) 
            System.out.printf("%5d", matrix[r][c]); 
        System.out.println(); 
    }
    }
  }
  

The boolean method i have tried NUMEROUS times is the allPositive method!

I cannot get it to return true if they are all positive with text that says:

"All the elements in this array are positive"

and if not say:

"Some elements in this array are negative"