try blocks in main

[Abigail Decan]

import java.io.*;
import java.util.List;
import java.util.ArrayList;

public class ListOfNumbers {
    try  {
        public static void main(String[] args)
        {
            int[] ar = new int[-1];
        }
    }
        catch(NegativeArraySizeException)
        {
            System.out.println("error!");
        }

}

i tried this code in BlueJ IDE.
it told me i had an illegal beginning for "try".
what did i do wrong?
am i not supposed to use try for main methods?

[Shubham Semwal]

There are multiple errors with the code :

1: try has to be within a block or method i.e {} but you used try inside class. so it'll not be executed..
2: catch should also be within block you've used both try and catch within class (i.e they are not associated with any method or block).
3: catch block isn't catching any exception. Use a variable of exception type to catch it.

Use try and catch inside main and it'll work.

try{
 int[] ar = new int[-1];  
  }  
     
 catch(NegativeArraySizeException e)  
  {  
  System.out.println("error!");  
  }