Multiplying long values?

Question

class Main {  
   public static void main (String[] args){  
     long value = 1024 * 1024 * 1024 * 80;  
     System.out.println(Long.MAX_VALUE);  
     System.out.         


        

Answer 1

This code:

long value = 1024 * 1024 * 1024 * 80; 

multiplies some integers together, converts it to a long and then assigns the result to a variable. The actual multiplication will be done by javac rather than when it runs.

Since int is 32 bits, the value is wrapped and results in a zero.

As you say, using long values in the right hand side will give a result which only wraps if it exceeds 64 bits.