blocks|key|265580|text|如果选择不使用String.format，则另一个选项是%2B二元运算符|type|unstyled|depth|inlineStyleRanges|entityRanges|data|265581|String+str+=+"Step+"+%2B+a+%2B+"+of+"+%2B+b;|code-block|syntax|javascript|265582|这相当于|265583|new+StringBuilder("Step+").append(String.valueOf(1)).append("+of+").append(String.valueOf(2));|offset|length|style|CODE|265584|无论使用哪一个，都是您的选择。StringBuilder更快，但速度差异很小。我更喜欢使用%2B运算符(它执行StringBuilder.append(String.valueOf(X)))并发现它更容易阅读。|265585|entityMap^0|0|0|0|0|2M|0|19|1|1H|14|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|V|8|@$K|W|L|X|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|Y|8|@$K|Z|L|10|M|N]|$K|11|L|12|M|N]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|R|$]]

If you choose not to use String.format, the other option is the + binary operator

<pre><code>String str = "Step " + a + " of " + b;
</code></pre>

This is the equivalent of

<code>new StringBuilder("Step ").append(String.valueOf(1)).append(" of ").append(String.valueOf(2));</code>

Whichever you use is your choice. StringBuilder is faster, but the speed difference is marginal. I prefer to use the <code>+</code> operator (which does a <code>StringBuilder.append(String.valueOf(X)))</code> and find it easier to read.

blocks|key|2957023|text|除了String.format之外，还可以看看java.text.MessageFormat。这种格式不那么简洁，更接近于您提供的C#示例，您也可以将其用于解析。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2957024|例如：|2957025|int+someNumber+=+42;
String+someString+=+"foobar";
Object[]+args+=+{new+Long(someNumber),+someString};
MessageFormat+fmt+=+new+MessageFormat("String+is+\"{1}\",+number+is+{0}.");
System.out.println(fmt.format(args));|code-block|syntax|javascript|2957026|一个更好的示例利用了Java+1.5中的varargs和自动装箱改进，并将上面的代码转换为一行代码：|2957027|MessageFormat.format("String+is+\"{1}\",+number+is+{0}.",+42,+"foobar");|2957028|在使用i18nized修饰符做选择复数时，MessageFormat稍微好一点。要指定在变量为1时正确使用单数形式的消息，否则指定为复数形式的消息，可以这样做：|2957029|String+formatString+=+"there+were+{0}+{0,choice,0#objects%7C1#object%7C1<objects}";
MessageFormat+fmt+=+new+MessageFormat(formatString);
fmt.format(new+Object[]+{+new+Long(numberOfObjects)+});|2957030|entityMap|0|LINK|mutability|MUTABLE|url|http://download.oracle.com/javase/6/docs/api/java/text/MessageFormat.html^0|N|N|N|N|0|0|0|0|0|0|L|D|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]]|D|@$9|15|A|16|1|17]]|E|$]]|$1|F|3|G|5|6|7|18|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|19|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1A|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|1B|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|1C|8|@$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|S|3|T|5|J|7|1F|8|@]|D|@]|E|$K|L]]|$1|U|3|-4|5|6|7|1G|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11]]]]

In addition to String.format, also take a look <a href="http://download.oracle.com/javase/6/docs/api/java/text/MessageFormat.html"><code>java.text.MessageFormat</code></a>. The format less terse and a bit closer to the C# example you've provided and you can use it for parsing as well.

For example: 

<pre><code>int someNumber = 42;
String someString = "foobar";
Object[] args = {new Long(someNumber), someString};
MessageFormat fmt = new MessageFormat("String is \"{1}\", number is {0}.");
System.out.println(fmt.format(args));
</code></pre>

A nicer example takes advantage of the varargs and autoboxing improvements in Java 1.5 and turns the above into a one-liner:

<pre><code>MessageFormat.format("String is \"{1}\", number is {0}.", 42, "foobar");
</code></pre>

<code>MessageFormat</code> is a little bit nicer for doing i18nized plurals with the choice modifier. To specify a message that correctly uses the singular form when a variable is 1 and plural otherwise, you can do something like this:

<pre><code>String formatString = "there were {0} {0,choice,0#objects|1#object|1&lt;objects}";
MessageFormat fmt = new MessageFormat(formatString);
fmt.format(new Object[] { new Long(numberOfObjects) });
</code></pre>

blocks|key|2957062|text|public+class+StringFormat+{

++++public+static+void+main(String[]+args)+{
++++++++++++Scanner+sc=new+Scanner(System.in);
++++++++++++System.out.println("================================");
++++++++++++for(int+i=0;i<3;i%2B%2B){
++++++++++++++++String+s1=sc.next();
++++++++++++++++int+x=sc.nextInt();
++++++++++++++++System.out.println(String.format("%25-15s%2503d",s1,x));
++++++++++++}
++++++++++++System.out.println("================================");

++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2957063|unstyled|2957064|胜过"================================“|blockquote|2957065|2957066|ved15space123+"================================|2957067|2957068|Java解决方案|offset|length|style|BOLD|2957069|2957070|+"-“用于左缩进|unordered-list-item|2957071|+"15”使字符串的最小长度为15|2957072|+"s“(它是%25之后的几个字符)将被我们的字符串|2957073|替换为0在左侧填充0<|2957074|>H1143使我们的整数最小长度为3|2957075|entityMap^0|0|0|0|0|0|0|0|8|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|17|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|18|8|@]|9|@]|A|$]]|$1|I|3|-4|5|E|7|19|8|@]|9|@]|A|$]]|$1|J|3|K|5|E|7|1A|8|@]|9|@]|A|$]]|$1|L|3|-4|5|E|7|1B|8|@]|9|@]|A|$]]|$1|M|3|N|5|E|7|1C|8|@$O|1D|P|1E|Q|R]]|9|@]|A|$]]|$1|S|3|-4|5|E|7|1F|8|@]|9|@]|A|$]]|$1|T|3|U|5|V|7|1G|8|@]|9|@]|A|$]]|$1|W|3|X|5|V|7|1H|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|V|7|1I|8|@]|9|@]|A|$]]|$1|10|3|11|5|V|7|1J|8|@]|9|@]|A|$]]|$1|12|3|13|5|E|7|1K|8|@]|9|@]|A|$]]|$1|14|3|-4|5|E|7|1L|8|@]|9|@]|A|$]]]|15|$]]

<pre><code>public class StringFormat {

 public static void main(String[] args) {
 Scanner sc=new Scanner(System.in);
 System.out.println("================================");
 for(int i=0;i&lt;3;i++){
 String s1=sc.next();
 int x=sc.nextInt();
 System.out.println(String.format("%-15s%03d",s1,x));
 }
 System.out.println("================================");

 }
}
</code></pre>

<blockquote>
 outpot
 "================================" 
 ved15space123
 ved15space123
 ved15space123
 "================================
</blockquote>

Java solution

<ul>
<li>The "-" is used to left indent</li>
<li>The "15" makes the String's minimum length it takes up be 15</li>
<li>The "s" (which is a few characters after %) will be substituted by our String</li>
<li>The 0 pads our integer with 0s on the left</li>
<li>The 3 makes our integer be a minimum length of 3</li>
</ul>

blocks|key|3171053|text|我已经为它写了一个简单的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3171054|public+class+SomeCommons+{
++++/**+Message+Format+like+'Some+String+{0}+/+{1}'+with+arguments+*/
++++public+static+String+msgFormat(String+s,+Object...+args)+{
++++++++return+new+MessageFormat(s).format(args);
++++}
}|code-block|syntax|javascript|3171055|因此，您可以将其用作：|3171056|SomeCommons.msfgFormat("Step+{1}+of+{2}",+1+,+"two");|3171057|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I've wrote my simple method for it : 

<pre><code>public class SomeCommons {
 /** Message Format like 'Some String {0} / {1}' with arguments */
 public static String msgFormat(String s, Object... args) {
 return new MessageFormat(s).format(args);
 }
}
</code></pre>

so you can use it as: 

<pre><code>SomeCommons.msfgFormat("Step {1} of {2}", 1 , "two");
</code></pre>

blocks|key|2957095|text|这个解决方案对我很有效。我需要为REST客户机动态创建restURL，所以我创建了这个方法，所以您只需像这样传递urls|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2957096|/customer/{0}/user/{1}/order|code-block|syntax|javascript|2957097|并根据需要添加任意数量的参数：|2957098|public+String+createURL+(String+restURL,+Object+...+params)+{+++++++
++++return+new+MessageFormat(restURL).format(params);
}|2957099|你只需要像这样调用这个方法：|2957100|createURL("/customer/{0}/user/{1}/order",+123,+321);|2957101|输出|2957102|2957103|+"/customer/123/user/321/order"|blockquote|2957104|2957105|entityMap^0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Z|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|11|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|13|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|14|8|@]|9|@]|A|$]]|$1|R|3|S|5|T|7|15|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|16|8|@]|9|@]|A|$]]|$1|V|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|W|$]]

This solution worked for me. I needed to create urls for a REST client dynamically so I created this method, so you just have to pass the restURL like this

<pre><code>/customer/{0}/user/{1}/order
</code></pre>

and add as many params as you need:

<pre><code>public String createURL (String restURL, Object ... params) { 
 return new MessageFormat(restURL).format(params);
}
</code></pre>

You just have to call this method like this:

<pre><code>createURL("/customer/{0}/user/{1}/order", 123, 321);
</code></pre>

The output 

<blockquote>
 "/customer/123/user/321/order"
</blockquote>

blocks|key|263993|text|我写了这个函数，它做了正确的事情。使用同名变量的值插入以$开头的单词。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|263994|private+static+String+interpol1(String+x){
++++Field[]+ffield+=++Main.class.getDeclaredFields();
++++String[]+test+=+x.split("+")+;
++++for+(String+v+:+test+)+{
++++++++for+(+Field+n:+ffield+)+{
++++++++++++if(v.startsWith("$")+&&+(+n.getName().equals(v.substring(1))++)){
++++++++++++++++try+{
++++++++++++++++++++x+=+x.replace("$"+%2B+v.substring(1),+String.valueOf(+n.get(null)));
++++++++++++++++}catch+(Exception+e){
++++++++++++++++++++System.out.println("");
++++++++++++++++}
++++++++++++}
++++++++}
++++}
++++return+x;
}|code-block|syntax|javascript|263995|entityMap^0|S|1|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|$]]

I wrote this function it does just the right thing. Interpolate a word starting with <code>$</code> with the value of the variable of the same name.

<pre><code>private static String interpol1(String x){
 Field[] ffield = Main.class.getDeclaredFields();
 String[] test = x.split(" ") ;
 for (String v : test ) {
 for ( Field n: ffield ) {
 if(v.startsWith("$") &amp;&amp; ( n.getName().equals(v.substring(1)) )){
 try {
 x = x.replace("$" + v.substring(1), String.valueOf( n.get(null)));
 }catch (Exception e){
 System.out.println("");
 }
 }
 }
 }
 return x;
}
</code></pre>

blocks|key|264006|text|Java+15|type|unstyled|depth|inlineStyleRanges|entityRanges|data|264007|从Java15开始，有了一个名为String::formatted(Object...+args)的新实例方法。|offset|length|style|CODE|264008|内部实现与String::format(String+format,+Object...+args)相同。|264009|264010|使用此字符串作为格式字符串以及提供的参数进行格式化。|blockquote|264011|264012|264013|String+step1+=+"one";
String+step2+=+"two";

//+results+in+"Step+one+of+two"
String+string+=+"Step+%25s+of+%25s".formatted(step1,+step2);+++++|code-block|syntax|javascript|264014|Advantage：不同之处在于该方法不是static，并且格式化模式本身是一个字符串，根据args从该字符串创建一个新的字符串。这允许链接首先构建格式本身。|BOLD|264015|Disadvantage：Locale没有重载方法，因此使用默认方法。如果您需要使用自定义Locale，则必须坚持使用String::format(Locale+l,String+format,Object...+args)。|264016|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/String.html#formatted(java.lang.Object...)|1|https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/String.html#format(java.lang.String,java.lang.Object...))|2|https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/String.html#format(java.util.Locale,java.lang.String,java.lang.Object...))^0|0|G|X|G|X|0|0|5|19|5|19|1|0|0|0|0|0|0|0|9|L|6|1A|4|0|0|C|D|6|19|6|1N|1H|1N|1H|2|0^^$0|@$1|2|3|4|5|6|7|1B|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1C|8|@$D|1D|E|1E|F|G]]|9|@$D|1F|E|1G|1|1H]]|A|$]]|$1|H|3|I|5|6|7|1I|8|@$D|1J|E|1K|F|G]]|9|@$D|1L|E|1M|1|1N]]|A|$]]|$1|J|3|-4|5|6|7|1O|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|1P|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|1R|8|@]|9|@]|A|$]]|$1|P|3|Q|5|R|7|1S|8|@]|9|@]|A|$S|T]]|$1|U|3|V|5|6|7|1T|8|@$D|1U|E|1V|F|W]|$D|1W|E|1X|F|G]|$D|1Y|E|1Z|F|G]]|9|@]|A|$]]|$1|X|3|Y|5|6|7|20|8|@$D|21|E|22|F|W]|$D|23|E|24|F|G]|$D|25|E|26|F|G]|$D|27|E|28|F|G]]|9|@$D|29|E|2A|1|2B]]|A|$]]|$1|Z|3|-4|5|6|7|2C|8|@]|9|@]|A|$]]]|10|$11|$5|12|13|14|A|$15|16]]|17|$5|12|13|14|A|$15|18]]|19|$5|12|13|14|A|$15|1A]]]]

<h2>Java 15</h2>
There is a new instance method called <a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/String.html#formatted(java.lang.Object...)" rel="noreferrer"><code>String::formatted(Object... args)</code></a> as of Java 15.
The internal implementation is same to <a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/String.html#format(java.lang.String,java.lang.Object...)" rel="noreferrer"><code>String::format(String format, Object... args)</code></a>.
<blockquote>
Formats using this string as the format string, and the supplied arguments.
</blockquote>
<pre><code>String step1 = &quot;one&quot;;
String step2 = &quot;two&quot;;

// results in &quot;Step one of two&quot;
String string = &quot;Step %s of %s&quot;.formatted(step1, step2); 
</code></pre>
Advantage: The difference is that the method is not <code>static</code> and the formatting pattern is a string itself from which a new one is created based on the <code>args</code>. This allows chaining to build the format itself first.
Disadvantage: There is no overloaded method with <code>Locale</code>, therefore uses the default one. If you need to use a custom <code>Locale</code>, you have to stick with <a href="https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/String.html#format(java.util.Locale,java.lang.String,java.lang.Object...)" rel="noreferrer"><code>String::format(Locale l,String format,Object... args)</code></a>.

blocks|key|265676|text|Apache+Commons文本中的org.apache.commons.text.StringSubstitutor助手类提供了命名变量替换|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|265677|Map<String,+String>+valuesMap+=+new+HashMap<>();
valuesMap.put("animal",+"quick+brown+fox");
valuesMap.put("target",+"lazy+dog");
String+resolved+=+new+StringSubstitutor(valuesMap).replace("The+${animal}+jumped+over+the+${target}.");
System.out.println(resolved);+//+The+quick+brown+fox+jumped+over+the+lazy+dog.|code-block|syntax|javascript|265678|entityMap|0|LINK|mutability|MUTABLE|url|https://commons.apache.org/proper/commons-text/javadocs/api-release/org/apache/commons/text/StringSubstitutor.html^0|I|15|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

The <a href="https://commons.apache.org/proper/commons-text/javadocs/api-release/org/apache/commons/text/StringSubstitutor.html" rel="nofollow noreferrer">org.apache.commons.text.StringSubstitutor</a> helper class from Apache Commons Text provides named variable substitution
<pre><code>Map&lt;String, String&gt; valuesMap = new HashMap&lt;&gt;();
valuesMap.put(&quot;animal&quot;, &quot;quick brown fox&quot;);
valuesMap.put(&quot;target&quot;, &quot;lazy dog&quot;);
String resolved = new StringSubstitutor(valuesMap).replace(&quot;The ${animal} jumped over the ${target}.&quot;);
System.out.println(resolved); // The quick brown fox jumped over the lazy dog.
</code></pre>

blocks|key|264049|text|Apache+Commons+StringSubstitutor提供了一种使用命名变量格式化String的简单且可读的方法。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|264050|import+org.apache.commons.text.StringSubstitutor;
//+...
Map<String,+String>+values+=+new+HashMap<>();
values.put("animal",+"quick+brown+fox");
values.put("target",+"lazy+dog");
StringSubstitutor+sub+=+new+StringSubstitutor(values);
String+result+=+sub.replace("The+${animal}+jumped+over+the+${target}.");
//+"The+quick+brown+fox+jumped+over+the+lazy+dog."|code-block|syntax|javascript|264051|此类支持为变量提供默认值。|264052|String+result+=+sub.replace("The+number+is+${undefined.property:-42}.");
//+"The+number+is+42."|264053|要使用递归变量替换，请调用setEnableSubstitutionInVariables(true);。|264054|Map<String,+String>+values+=+new+HashMap<>();
values.put("b",+"c");
values.put("ac",+"Test");
StringSubstitutor+sub+=+new+StringSubstitutor(values);
sub.setEnableSubstitutionInVariables(true);
String+result+=+sub.replace("${a${b}}");
//+"Test"|264055|entityMap|0|LINK|mutability|MUTABLE|url|https://commons.apache.org/proper/commons-text/javadocs/api-release/org/apache/commons/text/StringSubstitutor.html^0|F|H|1A|6|F|H|0|0|0|0|0|D|13|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@$9|15|A|16|1|17]]|E|$]]|$1|F|3|G|5|H|7|18|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|19|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|1A|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|1B|8|@$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|H|7|1E|8|@]|D|@]|E|$I|J]]|$1|S|3|-4|5|6|7|1F|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z]]]]

Apache Commons <a href="https://commons.apache.org/proper/commons-text/javadocs/api-release/org/apache/commons/text/StringSubstitutor.html" rel="nofollow noreferrer"><code>StringSubstitutor</code></a> provides a simple and readable way to do format <code>String</code>s with named variables.
<pre><code>import org.apache.commons.text.StringSubstitutor;
// ...
Map&lt;String, String&gt; values = new HashMap&lt;&gt;();
values.put(&quot;animal&quot;, &quot;quick brown fox&quot;);
values.put(&quot;target&quot;, &quot;lazy dog&quot;);
StringSubstitutor sub = new StringSubstitutor(values);
String result = sub.replace(&quot;The ${animal} jumped over the ${target}.&quot;);
// &quot;The quick brown fox jumped over the lazy dog.&quot;
</code></pre>
This class supports providing default values for variables.
<pre><code>String result = sub.replace(&quot;The number is ${undefined.property:-42}.&quot;);
// &quot;The number is 42.&quot;
</code></pre>
To use recursive variable replacement, call <code>setEnableSubstitutionInVariables(true);</code>.
<pre><code>Map&lt;String, String&gt; values = new HashMap&lt;&gt;();
values.put(&quot;b&quot;, &quot;c&quot;);
values.put(&quot;ac&quot;, &quot;Test&quot;);
StringSubstitutor sub = new StringSubstitutor(values);
sub.setEnableSubstitutionInVariables(true);
String result = sub.replace(&quot;${a${b}}&quot;);
// &quot;Test&quot;
</code></pre>

Primitive question, but how do I format strings like this:

<blockquote>
 "Step {1} of {2}"
</blockquote>

by substituting variables using Java? In C# it's easy.

How to format strings in Java

Java

原始问题，但是我如何格式化这样的字符串：“第{1}步，共{2}步”通过使用Java替换变量？在C#中，这很简单。

问如何在Java中格式化字符串
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