Java——内部类

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public class Cow {private double weight;public Cow(){}public Cow(double weight){this.weight=weight;}private class Cowleg{private double length;private String color;public Cowleg(){}public Cowleg(double length,String color){this.length=length;this.color=color;}public void setlength(double length){ this.length=length;}public double getlength(){return this.length;}public void setcolor(String color){this.color=color;}public String getcolor(){return this.color;}public void info(){System.out.println("当前牛的颜色"+color+",高"+length);System.out.println("重"+weight);}}public void test(){Cowleg c1=new Cowleg(1.12,"黑白相间");c1.info();}public static void main(String[] args) {Cow cow=new Cow(378.9);cow.test();}}<pre name="code" class="java">public class Dis {private String prop="外部类的实例变量";private class Inclass{private String prop="内部类的实例变量";//private表示只能在外部类内使用public void info(){String prop="局部变量";System.out.println("外部类的实例变量"+Dis.this.prop);//内部类的作用就是可直接访问外部类的私有变量。System.out.println("内部类的实例变量"+this.prop);System.out.println("局部变量"+prop);}}public void test(){Inclass in=new Inclass();in.info();}/*非静态内部类的成员只在非静态内部类范围可知，并不能被外部类直接使用。如果外部类需要访问内部类成员，必须创建非静态内部类对象来访问所有可以通过函数或者，new Inclass.prop来访问*/public static void main(String[] args) {new Dis().test();}}

public class Out {class In{public In(String msg){System.out.println(msg);}}}

public class Out {class In{public In(String msg){System.out.println(msg);}}}public class Fuck {public static void main(String[] args) {Out.In a=new Out().new In("hello world");//在外部类以外调用非静态内部类//如果是静态内部类， Out.In a=new Out().new In(),不需要对象。}}

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