为什么这段代码在我的netbeans中显示错误？

Question

I use this code in my class. but its shows the error. why we cant assign long value in the String array declaration? It showing possible loss converstion.

long n=10000000;
String ar[]=new String[n];

Answer 1

This is correct declaration. Use int instead of long . The Java JVM does not allow creating array in the size, range of long data type, so it is producing the warning (error) at the compile time.

int n=10000000;
String ar[]=new String[n];

I tried the following code:

public class Array {
  public static void main(String args[]) {
    int a[] = new int[Integer.MAX_VALUE];
  }
}

Got the following exception: Requested array size exceeds VM limit

Exception in thread "main" java.lang.OutOfMemoryError: Requested array size exceeds VM limit
    at gen2dArray.main(Array.java:7)

Answer 2

This question is likely the same as this

create an array of long

It is related to memory allocation. But we can use multi dimensional array to handle this.

On maximum integer array of string will take a huge amount of Memory.

Try use HashMap if you need to use large of array.