获取当前时间的方法 java.util.Calendar类

Calendar now=Calendar.getInstance();
        
        String string =Integer.toString(now.get(Calendar.YEAR))
     +Integer.toString(now.get(Calendar.MONTH)+1)
     +Integer.toString(now.get(Calendar.DAY_OF_MONTH))
     +Integer.toString(now.get(Calendar.HOUR_OF_DAY))
    +Integer.toString(now.get(Calendar.MINUTE))
    +Integer.toString(now.get(Calendar.SECOND));
    
        System.out.println(string);