blocks|key|2975674|text|请注意Java+6不再接收公共更新。您应该始终使用最更新的Java版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2975675|但是您可以在Oracle+Java存档上找到一些历史性的Java版本。这一页警告：|2975676|警告：这些旧版本的JRE和JDK是用来帮助开发人员调试旧系统中的问题的。不使用最新的安全修补程序进行更新，也不建议在生产中使用.。|blockquote|style|BOLD|2975677|下面是下载Java旧版本的链接：|2975678|Java+8存档下载|unordered-list-item|2975679|Java+7存档下载|2975680|Java+6存档下载|2975681|Java+5存档下载|2975682|JavaSE1.4存档下载|2975683|Java+1.3存档下载|2975684|Java+1.2存档下载|2975685|JavaSE1.1存档下载|2975686|entityMap|0|LINK|mutability|MUTABLE|url|http://www.oracle.com/technetwork/java/eol-135779.html#Interfaces|1|http://www.oracle.com/technetwork/java/javase/downloads/index-jsp-138363.html|2|http://www.oracle.com/technetwork/java/archive-139210.html|3|http://www.oracle.com/technetwork/java/javase/downloads/java-archive-javase8-2177648.html|4|http://www.oracle.com/technetwork/java/javase/downloads/java-archive-downloads-javase7-521261.html|5|http://www.oracle.com/technetwork/java/javase/downloads/java-archive-downloads-javase6-419409.html|6|http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-javase5-419410.html|7|http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-javase14-419411.html|8|http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-javase13-419413.html|9|http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-javase12-419414.html|10|http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-javase11-419415.html^0|3|E|0|P|A|1|0|6|D|2|0|0|3|10|S|0|0|0|A|3|0|0|A|4|0|0|A|5|0|0|A|6|0|0|D|7|0|0|C|8|0|0|C|9|0|0|D|A|0^^$0|@$1|2|3|4|5|6|7|1V|8|@]|9|@$A|1W|B|1X|1|1Y]|$A|1Z|B|20|1|21]]|C|$]]|$1|D|3|E|5|6|7|22|8|@]|9|@$A|23|B|24|1|25]]|C|$]]|$1|F|3|G|5|H|7|26|8|@$A|27|B|28|I|J]|$A|29|B|2A|I|J]]|9|@]|C|$]]|$1|K|3|L|5|6|7|2B|8|@]|9|@]|C|$]]|$1|M|3|N|5|O|7|2C|8|@]|9|@$A|2D|B|2E|1|2F]]|C|$]]|$1|P|3|Q|5|O|7|2G|8|@]|9|@$A|2H|B|2I|1|2J]]|C|$]]|$1|R|3|S|5|O|7|2K|8|@]|9|@$A|2L|B|2M|1|2N]]|C|$]]|$1|T|3|U|5|O|7|2O|8|@]|9|@$A|2P|B|2Q|1|2R]]|C|$]]|$1|V|3|W|5|O|7|2S|8|@]|9|@$A|2T|B|2U|1|2V]]|C|$]]|$1|X|3|Y|5|O|7|2W|8|@]|9|@$A|2X|B|2Y|1|2Z]]|C|$]]|$1|Z|3|10|5|O|7|30|8|@]|9|@$A|31|B|32|1|33]]|C|$]]|$1|11|3|12|5|O|7|34|8|@]|9|@$A|35|B|36|1|37]]|C|$]]|$1|13|3|-4|5|6|7|38|8|@]|9|@]|C|$]]]|14|$15|$5|16|17|18|C|$19|1A]]|1B|$5|16|17|18|C|$19|1C]]|1D|$5|16|17|18|C|$19|1E]]|1F|$5|16|17|18|C|$19|1G]]|1H|$5|16|17|18|C|$19|1I]]|1J|$5|16|17|18|C|$19|1K]]|1L|$5|16|17|18|C|$19|1M]]|1N|$5|16|17|18|C|$19|1O]]|1P|$5|16|17|18|C|$19|1Q]]|1R|$5|16|17|18|C|$19|1S]]|1T|$5|16|17|18|C|$19|1U]]]]

Please be aware that <a href="http://www.oracle.com/technetwork/java/eol-135779.html#Interfaces" rel="nofollow">Java 6 is no longer receiving public updates</a>. You always should use the <a href="http://www.oracle.com/technetwork/java/javase/downloads/index-jsp-138363.html" rel="nofollow">most updated Java version</a>.

But you can find some historical Java releases on <a href="http://www.oracle.com/technetwork/java/archive-139210.html" rel="nofollow">Oracle Java Archive</a>. The page warns:

<blockquote>
 WARNING: These older versions of the JRE and JDK are provided to help developers debug issues in older systems. They are not updated with the latest security patches and are not recommended for use in production.
</blockquote>

These are the links to download old versions of Java SE:

<ul>
<li><a href="http://www.oracle.com/technetwork/java/javase/downloads/java-archive-javase8-2177648.html" rel="nofollow">Java SE 8 Archive Downloads</a></li>
<li><a href="http://www.oracle.com/technetwork/java/javase/downloads/java-archive-downloads-javase7-521261.html" rel="nofollow">Java SE 7 Archive Downloads</a></li>
<li><a href="http://www.oracle.com/technetwork/java/javase/downloads/java-archive-downloads-javase6-419409.html" rel="nofollow">Java SE 6 Archive Downloads</a></li>
<li><a href="http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-javase5-419410.html" rel="nofollow">Java SE 5 Archive Downloads</a></li>
<li><a href="http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-javase14-419411.html" rel="nofollow">Java SE 1.4 Archive Downloads</a></li>
<li><a href="http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-javase13-419413.html" rel="nofollow">Java SE 1.3 Archive Downloads</a></li>
<li><a href="http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-javase12-419414.html" rel="nofollow">Java SE 1.2 Archive Downloads</a></li>
<li><a href="http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-javase11-419415.html" rel="nofollow">Java SE 1.1 Archive Downloads</a></li>
</ul>

blocks|key|1817817|text|这是可能的。许多值得注意的软件可以追溯到第一个版本(用于测试或其他目的)。你实际上可以找到并下载第一个版本的火狐，Chrome，Netbeans，WordPress等。他们只会让挖掘旧版本变得更加困难，而且他们故意为了好的理由而隐藏它。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1817818|提供这些较早版本的JRE和JDK是为了帮助开发人员调试旧系统中的问题。它们不使用最新的安全修补程序更新，也不建议在生产中使用。|blockquote|1817819|和|1817820|在您的系统上保留旧的和不受支持的Java版本会带来严重的安全风险。|1817821|(而且Java在安全性方面已经不太好了)|1817822|您不能“降级”某一版本的Java。您需要安装不同版本的Java，并将项目设置为使用该特定版本构建。在一个系统上，可以同时安装多个Java版本。|1817823|entityMap|0|LINK|mutability|MUTABLE|url|http://www.oracle.com/technetwork/java/archive-139210.html^0|2J|3|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|C|$]]|$1|G|3|H|5|6|7|11|8|@]|9|@]|C|$]]|$1|I|3|J|5|F|7|12|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|13|8|@]|9|@]|C|$]]|$1|M|3|N|5|6|7|14|8|@]|9|@]|C|$]]|$1|O|3|-4|5|6|7|15|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

It's possible. A lot of notable software can be traced to the very first version (for testing or other purposes). You can actually find and download the first version of Firefox, Chrome, Netbeans, WordPress etc. The same with Java. They just make it a little bit more difficult to dig the <a href="http://www.oracle.com/technetwork/java/archive-139210.html" rel="nofollow">old versions</a> up, and they intentionally hide it for good reasons.

<blockquote>
 These older versions of the JRE and JDK are provided to help developers debug issues in older systems. They are not updated with the latest security patches and are not recommended for use in production.
</blockquote>

and

<blockquote>
 Keeping old and unsupported versions of Java on your system presents a serious security risk.
</blockquote>

(and Java is already not really reputable, security-wise)

You cannot "downgrade" a certain version of Java. You install different versions of Java you need, and set your project to be built with that specific version. On a system, there can be several Java versions installed together.

I have Java 8 installed on my computer, before it was Java 7. But I need to work with version 6.

How can I install Java 6? On Oracle website, it is no longer possible to download the old versions.

How can I downgrade Java if it was not installed before?

Downgrade to Java 6

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在Java 7出现之前，我的计算机上已经安装了Java 8，但我需要使用版本6。如何安装Java 6？在Oracle网站上，不再可能下载旧版本。如果Java以前没有安装，我如何降低它的级别？

问降级至Java 6
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