Java Reference
In-Depth Information
int credit1=100, credit2=150;
int credit=credit1+credit2;
int debit1=50, debit2=25, debit3=100;
int debit=debit1+debit2+debit3;
int balance=credit-debit;
System.out.print("Balance:");
System.out.println(balance);
This example illustrates two constructions:
- Variable declaration and assignment to a constant (a basic expression —see
for example, variable credit1 )
- Variable declaration and assignment to an arithmetic expression (see for
example, variable debit1 ).
As we have formerly seen, variables are useful for storing initial values. Thus
these variables play an important role in the initialization of programs. For
example, the former program for computing the volume of a 3D box can be
rewritten as:
Program 1.9 Volume of a 3D box using double type variables
class VerboseVolumeBox2
{
public static void main ( String [ ] args )
double width=0.5, height =1.0, depth=0.2;
System . out . print ( "Volume of the box (in cubic meter):" );
System . out . println ( width height depth) ;
}
}
Java distinguishes upper from lower case in variable names, as exemplified
below:
Program 1.10 Java distinguishes upper/lower cases
class UpperLowerCase
{ public static void main ( String arguments [ ] )
int MyVar ;
// myvar variable is different from MyVar
int myvar ;
// Generate a syntax error at compile time:
// cannot find symbol variable myVar
System . out . println (myVar) ;
}
}
That is, Java is case-sensitive .
 
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