java数据类型的相互转换

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public class zhuanhuan {    //整形，小数，字符串，时间相互转换    public static void main(String[] args) throws ParseException    {        //数字和字符串相互转换        Integer i= 100;        String str = i.toString();        System.out.println(str);        int j = 200;        str = String.valueOf(j);        System.out.println(str);        String strNum = "789";        Integer n = Integer.parseInt(strNum);        n++;        System.out.println(n);        int t = (int) n;        System.out.println(t);        //时间和字符串相互转换        Date d = new Date();        SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd:HH:mm:ss");        String strDate = sdf.format(d);        System.out.println(strDate);        String strDate2 = "2005-06-5";        SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd");        Date date = sdf2.parse(strDate2);        System.out.println(date);        //日期的加减，使用日历对象Calendar        Calendar cal = Calendar.getInstance();        cal.setTime(date);        cal.add(Calendar.MONTH,2);        cal.add(Calendar.DATE,5);        cal.add(Calendar.DATE,-2);        Date date2 = cal.getTime();        SimpleDateFormat sdf3 = new SimpleDateFormat("yyyy-MM-dd");        String strdate2 = sdf3.format(date2);        System.out.println(strdate2);    }}
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