print?public class Test { 
 
    public static void main(String[] args) { 
        String date1="2013-06-24 12:30:30"; //  
        String date2="2013-06-26 12:30:31";   
        try { 
         if(jisuan(date1,date2)){ 
             System.out.println("可用");  
              
         }else{ 
             System.out.println("已过期"); 
         } 
        } catch (Exception e) { 
            // TODO: handle exception  
        } 
    } 
     
    //判断是否超过24小时  
    public static boolean jisuan(String date1, String date2) throws Exception { 
        java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("yyyy-M-d HH:mm:ss"); 
        java.util.Date start = sdf.parse(date1); 
        java.util.Date end = sdf.parse(date2); 
        long cha = end.getTime() - start.getTime(); 
        double result = cha * 1.0 / (1000 * 60 * 60); 
        if(result<=24){ 
             //System.out.println("可用");   
             return true; 
        }else{ 
             //System.out.println("已过期");  
             return false; 
        } 
    } 
     
}

判断两个日期是否超过24小时!