一,
1,内部类可以直接访问外部类的成员,包括私有。
2,外部类要访问内部类,必须建立内部类对象。
class Outer { int x = 3; class Inner{ void function(){ System.out.println("inner : " + x); } } void method(){ Inner in = new Inner(); in.function(); } } class InnerClassDome { public static void main (String[] args) { Outer out = new Outer(); out.method(); } }
二,
1,直接访问内部类的中的成员
class Outer { int x = 3; class Inner{ void function(){ System.out.println("inner : " + x); } } void method(){ Inner in = new Inner(); in.function(); } } class InnerClassDome { public static void main (String[] args) { //Outer out = new Outer(); //out.method(); Outer.Inner in = new Outer().new Inner(); in.function(); } }2,访问成员
之所以可以直接访问外部类的成员,是因为内部类中持有了一个外部类的引用,格式: 外部类名.this
class Outer { int x = 3; class Inner{ int x = 4; void function(){ int x = 6; System.out.println("inner : " + x); System.out.println("inner : " + this.x); System.out.println("inner : " + Outer.this.x); } } void method(){ Inner in = new Inner(); in.function(); } } class InnerClassDome { public static void main (String[] args) { //Outer out = new Outer(); //out.method(); Outer.Inner in = new Outer().new Inner(); in.function(); } }