Casting array to string in Java and python implementation

Question

There is this following code that I am having a problem wrapping my head around what (String) does. I am assuming that it is taking IR which is attached to a java panel(setvalue), casts memoryArray into a string, and sets the value of IR as that string but I am not sure. If yes, how does this differ from doing toString() as it is also used to cast array to string.

Also, I was wondering if this is possible to do in python simply.

 public static final int IR = 1;   
 int address2 = 3;
          
 Object[][] memoryArray = new Object[256][17];
 int memR2 = address2/16;
 int memC2 = address2 % 16 + 1;
 IR.setValue((" "+(String) memoryArray[memoryRow][memoryCol]).trim()); 
 System.out.println(IR);

Nowhere Man · Accepted Answer · 2020-11-01 09:42:06Z

1

Casting (String) memoryArray[memoryRow][memoryCol] would work only if the array contains a String object at [memoryRow][memoryCol], otherwise a runtime ClassCastException is thrown.

It is not the same as calling toString() method of Object which converts the object of any class to String. If object at [memoryRow][memoryCol] happens to be null, call to the toString method will result in NullPointerException.

answered Nov 1, 2020 at 9:42

Nowhere Man

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