JAVA学习第十六课（内部类及其特点）

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简单体现：

import out.in;

class out
{
	private int num  = 3;
	class in
	{
		public void showou()
		{
			System.out.println(num);
		}
	}
	public void showin()
	{
		in BLF = new in();
		BLF.showou();
	}
}
public class Main
{
	public static void main(String[] args)
	{
		out BLF = new out();
		BLF.showin();
	}
}

class out
{
	private static int num  = 3;
	static class in
	{
		public void showou()
		{
			System.out.println(num);//静态类中访问外部类的成员变量也必须是静态的
		}
		public static void showsta()
		{
			System.out.println("sta show"+num);
		}
	}
	public void showin()
	{
		in BLF = new in();
		BLF.showou();
	}
}
public class Main
{
	public static void main(String[] args)
	{
		//内部类是静态的，成员是非静态的
		out.in BLF = new out.in();
		BLF.showou();
		//如果内部类是静态的，成员也是静态的情况
		out.in.showsta();
	}
}

class out
{
	 int num  = 3;
	class in
	{
		int num = 4;
		public void showou()
		{
			int num = 5;
			System.out.println(num);//如果想打印4，this.num
			System.out.println(this.num);
			//也可以
			System.out.println(in.this.num);
			//如果想打印3
			System.out.println(out.this.num);
		}
		
	}
	public void showin()
	{
		in BLF = new in();
		BLF.showou();
	}
}
public class Main
{
	public static void main(String[] args)
	{
		out.in BLF = new out().new in();
		BLF.showou();
	}
}

class out
{
	int num = 3;
	void show1()
	{
		class in
		{
			void show()
			{
				System.out.print(num);
			}
		}
		
		in blf = new in();//创建对象，但是不能在外部类中创建
		blf.show();
	}

}
public class Main
{
	public static void main(String[] args)
	{
		out blfOut = new out();
		blfOut.show1();
	}
}

class out
{
	int num = 3;
	void show1()
	{
		final int x = 5;
		class in
		{
			void show()
			{
				System.out.println(x);
			}
		}
		
		in blf = new in();
		blf.show();
		
	}
}
public class Main
{
	public static void main(String[] args)
	{
		out blfOut = new out();
		blfOut.show1();
		
	}
}

class out
{
	int num = 3;
	Object show1()//如果这个方法是一个返回对象的方法
	{
		 int x = 5;
		class in
		{
			void show()
			{
				System.out.println(x);
			}
		}
		
		Object blf = new in();
		//blf.show();
		return blf;
	}
}
public class Main
{
	public static void main(String[] args)
	{
		out blfOut = new out();
		Object blfObject = blfOut.show1();//blfObject接受这个对象，那么blfOut的show1方法就执行完了
                 //那么就意味着show1的x就没了，所以必须加final，final修饰的x是终身为5，不会变化的
		
	}
}

JAVA学习第十六课（内部类及其特点）

标签：style   color   java   ar   strong   sp   on   c   代码   

原文地址：http://blog.csdn.net/wjw0130/article/details/39510999