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一 根据输入的日期组装指定的时间点

public class DateDmeo{
    private final static String STRING_FORMAT = "yyyy-MM-dd";
    private final static String INTACT_FORMAT = "yyyy-MM-dd HH:mm:ss";

    public static void main(String[] args) throws Exception{
        DateDmeo de = new DateDmeo();
        Date res = de.assembleDate(new Date(), "22:34");
        System.out.println("date=" + res);
    }

    // 组装特定日期
    public Date assembleDate(Date date, String time){
        String stringDate = null;
        try {
            stringDate = getStringDate(date, STRING_FORMAT);
            System.out.println("stringDate=" + stringDate);
        } catch (Exception e) {
            e.printStackTrace();
        }

        // 拼装成需要的string结果
        String result = stringDate +" " + time +":00";

        // 将string类型的日期转化成date类型
        Date dateResult = null;
        try {
            dateResult = stringToDate(result, INTACT_FORMAT);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return dateResult;
    }

    // 将Date类型的转化成指定样式的string类型
    public String getStringDate(Date date, String format) throws Exception {
        DateFormat df = new SimpleDateFormat(format);
        if(date == null || format == null){
            throw new Exception("输入日期字符不能为空");
        }
        return df.format(date);
    }

    // 将string类型的日期转化成date类型
    public Date stringToDate(String str, String format) throws Exception {
        Date date = new Date();
        try{
            date = new SimpleDateFormat(format).parse(str);
        }catch(Exception e){
            throw new Exception("输入日期不合法");
        }
        return date;
    }
}