Java 如何使用Calendar类在当前日期和时间值中加减周。

// 来 自 n o w j a v a . c o m

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import java.util.Calendar;

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public class Main {

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  public static void main(String[] args) {

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    //create Calendar instance

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    Calendar now = Calendar.getInstance();

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    System.out.println("Current date : " + (now.get(Calendar.MONTH) + 1)

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                        + "-"

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                        + now.get(Calendar.DATE)

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                        + "-"

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                        + now.get(Calendar.YEAR));// 来自 时   代    Java - nowjava.com

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    System.out.println("Current week of month is : " +

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                now.get(Calendar.WEEK_OF_MONTH));

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    System.out.println("Current week of year is : " +

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                now.get(Calendar.WEEK_OF_YEAR));

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    //add week to current date using Calendar.add method

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    now.add(Calendar.WEEK_OF_YEAR,1);

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    System.out.println("date after one week : " + (now.get(Calendar.MONTH) + 1)

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                        + "-"

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                        + now.get(Calendar.DATE)

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                        + "-"

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                        + now.get(Calendar.YEAR));

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    //subtract week from current date

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    now =Calendar.getInstance();

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    now.add(Calendar.WEEK_OF_YEAR,-50);

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