Question

This is my code snippet.I want to return 2D Object type array from the file data.txt
But i am getting error in the line labeled (1).
How can i achieve this.

Object data[][]=new Object[200][3];
try {
    ObjectInputStream ois=new ObjectInputStream(new FileInputStream("data.txt"));
    data=ois.readObject();  // error line!!!(1)
} catch(Exception exc) {
    System.out.println("error reading data.txt");
}  

Answer 1

readObject() returns an Object. If you know that the object is infact a Object[][], then you can cast it:

data = (Object[][]) ois.readObject();

Also: you don’t need create the 2D array in the first line, as that object will be discarded when you replace it with the one read from the file.