二元运算符'&&'的错误操作数类型

Question

Not sure what is wrong here. This line "if (ocean[row][col]==null && ocean2[row][col] = null)". I tried ((ocean[row][col])==null && (ocean2[row][col]) = null). Still it's wrong. Can anyone help me?

public static void deployCompShips(String[][] ocean) {
            Random rand = new Random();
            System.out.println("Computer is deploying ships");
            while (compShips < 5) {
                int col = rand.nextInt(10);
                int row = rand.nextInt(10);
    
                if (ocean[row][col]==null && ocean2[row][col] = null) {
                    System.out.println((compShips+1)+". ship DEPLOYED");
                    ocean2[row][col] = "@";
                    compShips++;
                }
            }
        }

Answer 1

You can't use assignment operator to compare two values.

                                              
if (ocean[row][col]==null && ocean2[row][col] = null) 
                                              ^
                                              |
                                      using assignment operator