java取得昨天和明天的格式化日期

java.text.SimpleDateFormat df=new java.text.SimpleDateFormat( "yyyy-MM-dd ");

java.util.Calendar calendar=java.util.Calendar.getInstance();

calendar.roll(java.util.Calendar.DAY_OF_YEAR,-1);

System.out.println( "昨天： "+df.format(calendar.getTime()));

calendar=java.util.Calendar.getInstance();

System.out.println( "今天： "+df.format(calendar.getTime()));

calendar.roll(java.util.Calendar.DAY_OF_YEAR,1);

System.out.println( "明天： "+df.format(calendar.getTime()));