I have a problem with Java inner classes which I can't figure out. Suppose you have
class Outer
{
int outer = 0;
class Inner
{
int inner = Outer.this.outer; //(or just outer as it is not shadowed)
inner = 3; //or whatever, even outer = 3
}
}
Well, when I write the last assignment I get the compilation error
Syntax error on token ";", , expected
on the precedent line.
Why I cannot modify inner?
Thank you!
You cannot have a statement outside a method. One technique would be to use an instance initializer block:
class Outer
{
int outer = 0;
class Inner
{
int inner = Outer.this.outer; //(or just outer as it is not shadowed)
// instance initializer block:
{
inner = 3; //or whatever, even outer = 3
}
}
}
Alternatively, define a constructor:
class Outer
{
int outer = 0;
class Inner
{
int inner = Outer.this.outer; //(or just outer as it is not shadowed)
Inner() {
inner = 3; //or whatever, even outer = 3
}
}
}
You have to place the code in a method or in the constructor:
class Outer
{
int outer = 0;
class Inner
{
int inner = Outer.this.outer;
public Inner() {
inner = 3;
}
public increment() {
inner++;
}
}
}
Your assignment to inner must be inside a method or constructor, not "loose" in the class.
You need to include the line:
inner=3;
in a method in the inner class.
Yuo can not directly initialize inner = 3; outside method.Make sure that inner = 3; inside any method or constructor.
public Inner()
{
inner = 3;
}
