blocks|key|1139602|text|10美分的答案是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1139603|C#的|1139604|String.Format("{0}+--+{1}+--+{2}",+ob1,+ob2,+ob3)|code-block|syntax|javascript|1139605|相当于Java的|1139606|String.format("%251$s+--+%252$s+--+%253$s",+ob1,+ob2,+ob3)|1139607|注意从1开始的索引，"s“表示使用.toString()转换为字符串。还有许多其他可用的转换和格式选项：|1139608|http://download.oracle.com/javase/1.5.0/docs/api/java/util/Formatter.html#syntax|offset|length|1139609|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|0|0|0|0|28|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|11|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|12|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|13|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|14|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|15|8|@]|9|@$Q|16|R|17|1|18]]|A|$]]|$1|S|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|P]]]]

The 10 cent answer to this is:

C#'s

<pre><code>
String.Format("{0} -- {1} -- {2}", ob1, ob2, ob3)
</code></pre>

is equivalent to Java's

<pre><code>
String.format("%1$s -- %2$s -- %3$s", ob1, ob2, ob3)
</code></pre>

Note the 1-based index, and the "s" means to convert to string using .toString(). There are many other conversions available and formatting options:

<a href="http://download.oracle.com/javase/1.5.0/docs/api/java/util/Formatter.html#syntax">http://download.oracle.com/javase/1.5.0/docs/api/java/util/Formatter.html#syntax</a>

blocks|key|1139707|text|有一个使用.net表示法的MessageFormat.format()。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1139708|entityMap^0|D|M|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

There is <code>MessageFormat.format()</code> which uses the .net notation.

blocks|key|924984|text|虽然语法与.NET略有不同，但Java中有一个String.format。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|924985|entityMap|0|LINK|mutability|MUTABLE|url|http://download.oracle.com/javase/1.5.0/docs/api/java/lang/String.html#format%2528java.util.Locale,%2520java.lang.String,%2520java.lang.Object...%2529^0|N|D|N|D|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

There is a <a href="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/String.html#format%28java.util.Locale,%20java.lang.String,%20java.lang.Object...%29" rel="noreferrer"><code>String.format</code></a> in Java, although the syntax is a little different from in .NET.

blocks|key|1139803|text|这并不是对OP问题的真正回答，但对于正在寻找一种简单的方法将字符串替换为包含C#样式的“格式项”的字符串的其他人来说，这可能是有帮助的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1139804|+++/**
++++*+Method+to+"format"+an+array+of+objects+as+a+single+string,+performing+two+possible+kinds+of
++++*+formatting:
++++*
++++*+1.+If+the+first+object+in+the+array+is+a+String,+and+depending+on+the+number+of+objects+in+the
++++*++++array,+then+a+very+simplified+and+simple-minded+C#-style+formatting+is+done.+Format+items
++++*++++"{0}",+"{1}",+etc.,+are+replaced+by+the+corresponding+following+object,+converted+to+string
++++*++++(of+course).+These+format+items+must+be+as+shown,+with+no+fancy+formatting+tags,+and+only
++++*++++simple+string+substitution+is+done.
++++*
++++*+2.+For+the+objects+in+the+array+that+do+not+get+processed+by+point+1+(perhaps+all+of+them,
++++*++++perhaps+none)+they+are+converted+to+String+and+concatenated+together+with+"+-+"+in+between.
++++*
++++*+@param+objectsToFormat++Number+of+objects+in+the+array+to+process/format.
++++*+@param+arrayOfObjects++Objects+to+be+formatted,+or+at+least+the+first+objectsToFormat+of+them.
++++*+@return++Formatted+string,+as+described+above.
++++*/
+++public+static+String+formatArrayOfObjects(int+objectsToFormat,+Object...+arrayOfObjects)+{

++++++//+Make+a+preliminary+pass+to+avoid+problems+with+nulls
++++++for+(int+i+=+0;+i+<+objectsToFormat;+i%2B%2B)+{
+++++++++if+(arrayOfObjects[i]+==+null)+{
++++++++++++arrayOfObjects[i]+=+"null";
+++++++++}
++++++}

++++++//+If+only+one+object,+just+return+it+as+a+string
++++++if+(objectsToFormat+==+1)+{
+++++++++return+arrayOfObjects[0].toString();
++++++}

++++++int+nextObject+=+0;
++++++StringBuilder+stringBuilder+=+new+StringBuilder();

++++++//+If+first+object+is+a+string+it+is+necessary+to+(maybe)+perform+C#-style+formatting
++++++if+(arrayOfObjects[0]+instanceof+String)+{
+++++++++String+s+=+(String)+arrayOfObjects[0];

+++++++++while+(nextObject+<+objectsToFormat)+{

++++++++++++String+formatItem+=+"{"+%2B+nextObject+%2B+"}";
++++++++++++nextObject%2B%2B;
++++++++++++if+(!s.contains(formatItem))+{
+++++++++++++++break;
++++++++++++}

++++++++++++s+=+s.replace(formatItem,+arrayOfObjects[nextObject].toString());
+++++++++}

+++++++++stringBuilder.append(s);
++++++}

++++++//+Remaining+objects+(maybe+all+of+them,+maybe+none)+are+concatenated+together+with+"+-+"
++++++for+(;+nextObject+<+objectsToFormat;+nextObject%2B%2B)+{
+++++++++if+(nextObject+>+0)+{
++++++++++++stringBuilder.append("+-+");
+++++++++}
+++++++++stringBuilder.append(arrayOfObjects[nextObject].toString());
++++++}

++++++return+stringBuilder.toString();
+++}|code-block|syntax|javascript|1139805|(如果您感兴趣，我将使用这段代码作为Android+Log方法的简单包装器的一部分，以便更容易在一条日志消息中记录多个事件。)|1139806|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This isn't really an answer to the OP's question, but may be helpful to others who are looking for a simple way of performing substitution of strings into a string containing C#-style "format items".

<pre><code> /**
 * Method to "format" an array of objects as a single string, performing two possible kinds of
 * formatting:
 *
 * 1. If the first object in the array is a String, and depending on the number of objects in the
 * array, then a very simplified and simple-minded C#-style formatting is done. Format items
 * "{0}", "{1}", etc., are replaced by the corresponding following object, converted to string
 * (of course). These format items must be as shown, with no fancy formatting tags, and only
 * simple string substitution is done.
 *
 * 2. For the objects in the array that do not get processed by point 1 (perhaps all of them,
 * perhaps none) they are converted to String and concatenated together with " - " in between.
 *
 * @param objectsToFormat Number of objects in the array to process/format.
 * @param arrayOfObjects Objects to be formatted, or at least the first objectsToFormat of them.
 * @return Formatted string, as described above.
 */
 public static String formatArrayOfObjects(int objectsToFormat, Object... arrayOfObjects) {

 // Make a preliminary pass to avoid problems with nulls
 for (int i = 0; i &lt; objectsToFormat; i++) {
 if (arrayOfObjects[i] == null) {
 arrayOfObjects[i] = "null";
 }
 }

 // If only one object, just return it as a string
 if (objectsToFormat == 1) {
 return arrayOfObjects[0].toString();
 }

 int nextObject = 0;
 StringBuilder stringBuilder = new StringBuilder();

 // If first object is a string it is necessary to (maybe) perform C#-style formatting
 if (arrayOfObjects[0] instanceof String) {
 String s = (String) arrayOfObjects[0];

 while (nextObject &lt; objectsToFormat) {

 String formatItem = "{" + nextObject + "}";
 nextObject++;
 if (!s.contains(formatItem)) {
 break;
 }

 s = s.replace(formatItem, arrayOfObjects[nextObject].toString());
 }

 stringBuilder.append(s);
 }

 // Remaining objects (maybe all of them, maybe none) are concatenated together with " - "
 for (; nextObject &lt; objectsToFormat; nextObject++) {
 if (nextObject &gt; 0) {
 stringBuilder.append(" - ");
 }
 stringBuilder.append(arrayOfObjects[nextObject].toString());
 }

 return stringBuilder.toString();
 }
</code></pre>

(And in case you're curious, I'm using this code as part of a simple wrapper for the Android Log methods, to make it easier to log multiple things in a single log message.)

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