package hello;  
interface competer{  //定义接口 
  void set_compt(int com); 
  void print_compt_information(); 
} 
 
 
class bj implements competer{ //接口实现 
   
  int com ;  
  public void set_compt(int com) 
  { 
    this.com = com ; 
  // System.out.println("端口" + com); 
  } 
  public void print_compt_information() 
  { 
    System.out.println("端口" + com); 
    System.out.println("笔记本"); 
  } 
} 
 
class taishi implements competer{ 
   
  int com ; 
  public void set_compt(int com) 
  { 
    this.com = com ; 
    //System.out.println("端口" + com); 
  } 
  public void print_compt_information() 
  { 
    System.out.println("端口" + com); 
    System.out.println("台式机"); 
  } 
   
} 
 
public class inter { 
  public static void main(String[] args) 
  { 
    taishi com = new taishi(); 
    bj bjj = new bj(); 
    com.set_compt(100); 
    bjj.set_compt(120); 
    com.print_compt_information(); 
    bjj.print_compt_information(); 
  } 
} 

端口100
台式机
端口120
笔记本