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public class Jb34_InnerClass2
{
public static void main ( String [ ] args )
{
new Outer ( ) . method ( ) ;
new Outer2 ( ) . method ( ) ;
}
}
/*
为什么内部类可以直接访问外部类中的成员
内部类持有外部类的引用。 外部类名.this
*/
class Outer
{
int num = 1 ;
class Inner
{
int num = 2 ;
void show ( )
{
int num = 3 ;
System . out . println ( num ) ; //打印show方法内的成员
System . out . println ( this . num ) ; //打印内部中的成员
System . out . println ( Outer . this . num ) ; //打印外部类中的成员
}
}
void method ( )
{
new Inner ( ) . show ( ) ;
}
}
//JDK1.7之前，
//JDK1.8时，内部类在局部位置上可以直接访问局部变量
class Outer2
{
int num = 1 ;
void method ( )
{
int x = 2 ; //局部变量x
class Inner2
{
void show ( )
{
System . out . println ( "show" + x ) ;
}
}
Inner2 in = new Inner2 ( ) ;
in . show ( ) ;
}
}
