Variable Storage and Global Variables in Java

hi
i had two querys..so please answer me if u have time

1. why a single value can be stored in a variable ? why cant we store two values ? i mean int a=5 means 5 is stored in a variable a...why cant we store 2 values..i want to know the exact reason.. ?

2.Why global varaibles concept is not present in java ? Is there any security problem or referrential transparency problem ? if not how can we implement that functionality ?

Quote:

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why cant we store two values

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That is true of many things. Either it has one value or another value. What things can you think of that can have more than one value?

You can store 32 bit values in an int. And appoximately infinitely many in a BigDecimal (*).

public class Global {static int answer = 42;}

(*) nyah, nyah

You can have globally accessible variables as shown by pbrockway, but they're frowned upon as bad coding practice.
Constants, no problem, but variables aren't generally a good idea.