java 编译 xlint_java – 使用-Xlint重新编译：弃用以获取详细信息

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我需要知道如何修复这些错误说明：

Note: Summer.java uses or overrides a deprecated API.

Note: Recompile with -Xlint:deprecation for details.

这是我的代码：

import java.util.Calendar;

import java.util.*;

class Summer

{

public static void main(String[] args)

{

Date d1 = new Date();

Date j21 = new Date(d1.getYear(),6,21);

if(d1.before(j21)) {

long diff = j21.getTime() - d1.getTime();

diff = diff / (1000 * 60 * 60 * 24);

System.out.println("There are " + diff + " days until June 21st" );

}

else {

long diff = d1.getTime() - j21.getTime();

diff = diff / (1000 * 60 * 60 * 24);

diff = 365 - diff;

System.out.println("There are " + diff + " days until June 21st" );

}

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