public class PeopleCount				//外部類PeopleCount
{
private String Name;
    	private int ID;               		//外部類的私有成員變量
    	private static int count = 0;       //外部類的static私有成員變量    
    	public class People             		//內部類People
    	{
     	public People()					//內部類的構造方法
        	{
         		count++; 					//訪問外部類的成員變量
            	ID = count;					//訪問外部類的成員變量
        	}
        	public void output()			//內部類的方法
        	{
         		System.out.println(Name + "的ID為：" + ID);
        	}
    	}
    	public PeopleCount(String sn)		//外部類的構造方法
    	{
    		Name = sn;	
    	}

    	public void output()            		//外部類的方法
    	{
     	People p = new People();   		//建立內部類對象p
        	p.output();                 		//通過p調用內部類的方法
    	}
    	public static void main (String args[])
    	{
     	PeopleCount p1 = new PeopleCount("張三");
        	p1.output();
        	PeopleCount p2 = new PeopleCount("李四");
        	p2.output();        
    	}
}