Java Reference
In-Depth Information
When you run this program, you will see the following output:
This program introduces several new concepts. First, the statement
declares a variable called var1 of type integer. In Java, all variables must be declared before
they are used. Further, the type of values that the variable can hold must also be specified.
This is called the type of the variable. In this case, var1 can hold integer values. These are
whole number values. In Java, to declare a variable to be of type integer, precede its name
with the keyword int . Thus, the preceding statement declares a variable called var1 of type
int .
The next line declares a second variable called var2 :
Notice that this line uses the same format as the first line except that the name of the vari-
able is different.
In general, to declare a variable you will use a statement like this:
type var-name;
Here, type specifies the type of variable being declared, and var-name is the name of the
variable. In addition to int , Java supports several other data types.
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