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  • Static

    1.统计产生对象的数量。

      class Book{
        private String title ;
        private static int num = 0 ;

       public Book (String book){
        num ++ ;
        System.out.println("This is the num" + num + "book" ) ;
        }
    }
    public class Static{
        public static void main(String args[]){
            Book b1 = new Book ("..") ;
            Book b2 = new Book ("..") ;
            Book b3 = new Book ("..") ;
            Book b4 = new Book ("..") ;
            Book b5 = new Book ("..") ;
        }   
    }

    2.自动获得编号

    class Book{
        private String title ;
        private static int num = 0 ;
        
        public Book(){
            this("NOTITL" + num++ ) ;
        }
        public Book(String title){
            this.title = title ;
        }
        public String getTitle(){
            return this.title ;
        }
         
    }
    public class Static{
        public static void main(String args[]){
            System.out.println(new Book().getTitle()) ;
            System.out.println(new Book().getTitle()) ;
            System.out.println(new Book().getTitle()) ;
            System.out.println(new Book().getTitle()) ;
            System.out.println(new Book().getTitle()) ;
        }   
    }

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  • 原文地址:https://www.cnblogs.com/da-peng/p/5119032.html
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