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  • java 小知识

    public static void main(String[] args) {

    System.out.println( getMonthStart());
    System.out.println( getNextMonthStart());
    System.out.println( getMonthEnd());

    }

    //月初时间
    public static String getMonthStart() {
    Calendar cal = Calendar.getInstance();
    SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");

    cal.set(Calendar.DAY_OF_MONTH,1);
    return df.format(cal.getTime());
    }

    下月月初时间

    public static String getNextMonthStart() {
    Calendar cal = Calendar.getInstance();
    SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
    cal.add(Calendar.MONTH, 1);
    cal.set(Calendar.DAY_OF_MONTH,1);
    return df.format(cal.getTime());
    }
    月末时间
    public static String getMonthEnd() {
    Calendar cal = Calendar.getInstance();
    SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
    cal.add(Calendar.MONTH, 1);
    cal.set(Calendar.DAY_OF_MONTH,0);
    return df.format(cal.getTime());
    }

    //周一
    public static String getMonday(int i) {
    Calendar cal = Calendar.getInstance();
    SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");

    cal.add(Calendar.DATE, -i*7);
    cal.set(Calendar.DAY_OF_WEEK,Calendar.MONDAY);
    return df.format(cal.getTime());
    }
    //周末
    public static String getSunday(int i) {
    Calendar cal = Calendar.getInstance();
    SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
    cal.add(Calendar.DATE, (-i+1)*7);
    cal.set(Calendar.DAY_OF_WEEK,Calendar.SUNDAY);
    return df.format(cal.getTime());
    }

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  • 原文地址:https://www.cnblogs.com/santian/p/4976909.html
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