}
}
class InnerClassDemo {
public static void main(String args[]) {
Outer outer = new Outer();
outer.test();
}
}
Here, y is declared as an instance variable of Inner. Thus, it is not known outside of that
class and it cannot be used by showy( ).
Although we have been focusing on inner classes declared as members within an outer
class scope, it is possible to define inner classes within any block scope. For example, you
can define a nested class within the block defined by a method or even within the body of a
for loop, as this next program shows.
// Define an inner class within a for loop.
class Outer {
int outer_x = 100;
void test() {
for(int i=0; i<10; i++) {
class Inner {
void display() {
System.out.println("display: outer_x = " + outer_x);
}
}
Inner inner = new Inner();
inner.display();
}
}
}
class InnerClassDemo {
public static void main(String args[]) {
Outer outer = new Outer();
outer.test();
}
}
The output from this version of the program is shown here.
display:
outer_x
=
100
display:
outer_x
=
100
display:
outer_x
=
100
display:
outer_x
=
100
display:
outer_x
=
100
display:
outer_x
=
100
display:
outer_x
=
100
display:
outer_x
=
100
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