JAVA Calendar日期加1

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");  
try{  
    Date d = sdf.parse("2018-01-31");  
    Calendar cld = Calendar.getInstance();  
    cld.setTime(d);  
    cld.add(Calendar.MONTH, 1);  
    Date d2 = cld.getTime();  
    System.out.println(sdf.format(d)+"加一月："+sdf.format(d2));  
      
    //闰年的情况  
    d = sdf.parse("2016-01-31");  
    cld = Calendar.getInstance();  
    cld.setTime(d);  
    cld.add(Calendar.MONTH, 1);  
    d2 = cld.getTime();  
    System.out.println(sdf.format(d)+"加一月："+sdf.format(d2));  
      
}catch(Exception e){  
    e.printStackTrace();  
}