blocks|key|72322|text|如果您可以更改占位符的格式，则可以使用String.format()。如果没有，您也可以将其替换为预处理。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|72323|String.format("hello+%25s!",+"world");|code-block|syntax|javascript|72324|有关更多信息，请访问this+other+thread。|72325|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/3695230/how-to-use-java-string-format^0|J|F|0|0|A|H|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

If you can change the format of your placeholder, you could use <code>String.format()</code>. If not, you could also replace it as pre-processing.

<pre><code>String.format("hello %s!", "world");
</code></pre>

More information in <a href="https://stackoverflow.com/questions/3695230/how-to-use-java-string-format">this other thread</a>.

blocks|key|289656|text|如果您可以容忍不同类型的占位符(即用%25s代替{})，则可以使用String.format方法：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|289657|String+s+=+"hello+%25s!";
s+=+String.format(s,+"world"+);
assertEquals(s,+"hello+world!");+//+true|code-block|syntax|javascript|289658|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.oracle.com/javase/6/docs/api/java/lang/String.html#format%2528java.lang.String,%2520java.lang.Object...%2529^0|I|2|M|2|V|D|V|D|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

If you can tolerate a different kind of placeholder (i.e. <code>%s</code> in place of <code>{}</code>) you can use <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html#format%28java.lang.String,%20java.lang.Object...%29" rel="noreferrer"><code>String.format</code></a> method for that:

<pre><code>String s = "hello %s!";
s = String.format(s, "world" );
assertEquals(s, "hello world!"); // true
</code></pre>

blocks|key|289682|text|您不需要库；如果您使用的是最新版本的Java，那么可以看看String.format|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|289683|String.format("Hello+%25s!",+"world");|code-block|syntax|javascript|289684|entityMap^0|T|D|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

You won't need a library; if you are using a recent version of Java, have a look at <code>String.format</code>:

<pre><code>String.format("Hello %s!", "world");
</code></pre>

blocks|key|289689|text|请参见String.format方法。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|289690|String+s+=+"hello+%25s!";
s+=+String.format(s,+"world");
assertEquals(s,+"hello+world!");+//+should+be+true|code-block|syntax|javascript|289691|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.oracle.com/javase/8/docs/api/java/lang/String.html#format-java.lang.String-java.lang.Object...-^0|3|D|3|D|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@$9|V|A|W|1|X]]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

See <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html#format-java.lang.String-java.lang.Object...-"><code>String.format</code></a> method.

<pre><code>String s = "hello %s!";
s = String.format(s, "world");
assertEquals(s, "hello world!"); // should be true
</code></pre>

blocks|key|289743|text|这可以在不使用库的情况下在一行中完成。请检查java.text.MessageFormat类。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|289744|示例|289745|String+stringWithPlaceHolder+=+"test+String+with+placeholders+{0}+{1}+{2}+{3}";
String+formattedStrin+=+java.text.MessageFormat.format(stringWithPlaceHolder,+"place-holder-1",+"place-holder-2",+"place-holder-3",+"place-holder-4");|code-block|syntax|javascript|289746|输出将是|289747|test+String+with+placeholders+place-holder-1+place-holder-2+place-holder-3+place-holder-4|289748|entityMap^0|M|N|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|W|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|X|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|Y|8|@]|D|@]|E|$K|L]]|$1|Q|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|R|$]]

This can be done in a single line without the use of library. Please check <code>java.text.MessageFormat</code> class.

Example

<pre><code>String stringWithPlaceHolder = "test String with placeholders {0} {1} {2} {3}";
String formattedStrin = java.text.MessageFormat.format(stringWithPlaceHolder, "place-holder-1", "place-holder-2", "place-holder-3", "place-holder-4");
</code></pre>

Output will be 

<pre><code>test String with placeholders place-holder-1 place-holder-2 place-holder-3 place-holder-4
</code></pre>

blocks|key|289766|text|https://stackoverflow.com/users/4290127/himanshu-chaudhary的建议效果很好：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|289767|String+str+=+"Hello+this+is+{}+string+{}";+++++
str+=+MessageFormatter.format(str,+"hello",+"world").getMessage();|code-block|syntax|javascript|289768|
<dependency>
++++<groupId>org.slf4j</groupId>
++++<artifactId>slf4j-api</artifactId>
++++<version>1.8.0-beta4</version>
</dependency>|289769|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/users/4290127/himanshu-chaudhary^0|0|1M|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|F|7|X|8|@]|9|@]|C|$G|H]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

The suggestion by <a href="https://stackoverflow.com/users/4290127/himanshu-chaudhary">https://stackoverflow.com/users/4290127/himanshu-chaudhary</a> works quite well:
<pre><code>String str = &quot;Hello this is {} string {}&quot;; 
str = MessageFormatter.format(str, &quot;hello&quot;, &quot;world&quot;).getMessage();
</code></pre>
<pre><code>&lt;!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api --&gt;
&lt;dependency&gt;
 &lt;groupId&gt;org.slf4j&lt;/groupId&gt;
 &lt;artifactId&gt;slf4j-api&lt;/artifactId&gt;
 &lt;version&gt;1.8.0-beta4&lt;/version&gt;
&lt;/dependency&gt;
</code></pre>

blocks|key|72460|text|如果你想使用一些字符串来表示不同的占位符，你可以使用这样的指针：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|72461|String.format("%251$s+%252$s+%251$s",+"startAndEndText",+"middleText");|code-block|syntax|javascript|72462|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you want to use some string to different placeholders, you could use pointers like this:
<pre><code>String.format(&quot;%1$s %2$s %1$s&quot;, &quot;startAndEndText&quot;, &quot;middleText&quot;);
</code></pre>

I'm looking for something to achieve the following:

<pre><code>String s = "hello {}!";
s = generate(s, new Object[]{ "world" });
assertEquals(s, "hello world!"); // should be true
</code></pre>

I could write it myself, but It seems to me that I saw a library once which did this, probably it was the slf4j logger, but i don't want to write log messages. I just want to generate strings.

Do you know about a library which does this?

Java generating Strings with placeholders

Java

我正在寻找一些东西来实现以下目标：String s = "hello {}!";s = generate(s, new Object[]{ "world" });assertEquals(s, "hello world!"); // should be true我可以自己写，但我似乎曾经见过这样的库，可能是slf4j记...

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