StackOverflow2013

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PO
primarykey
Id
12445206
data
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0
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0
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CreationDate
2012-09-16T07:39:46.940
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2012-09-16T07:39:46.940
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0
OwnerUserId
227140
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12445064
PostTypeId
2
Score
5
ViewCount
0
LastEditorDisplayName
text
Body
To see what the Java compiler produces it is always useful to use <code>javap -c</code> to show the actual bytecode produced: For example the following Java code: <pre><code>String s1 = "Four" + 4; int i = 4; String s2 = "Four" + i; </code></pre> would produce the following bytecode: <pre><code> 0: ldc #2; //String Four4 2: astore_1 3: iconst_4 4: istore_2 5: new #3; //class java/lang/StringBuilder 8: dup 9: invokespecial #4; //Method java/lang/StringBuilder."<init>":()V 12: ldc #5; //String Four 14: invokevirtual #6; //Method java/lang/StringBuilder.append:(Ljava/lang/ String;)Ljava/lang/StringBuilder; 17: iload_2 18: invokevirtual #7; //Method java/lang/StringBuilder.append:(I)Ljava/lan g/StringBuilder; 21: invokevirtual #8; //Method java/lang/StringBuilder.toString:()Ljava/la ng/String; 24: astore_3 25: return </code></pre> From this we can see: <ul> <li>In the case of <code>"Four" + 4</code>, the Java compiler (I was using JDK 6) was clever enough to deduce that this is a constant, so there is no computational effort at runtime, as the string is concatenated at compile time</li> <li>In the case of <code>"Four" + i</code>, the equivalent code is <code>new StringBuilder().append("Four").append(i).toString()</code></li> <li>Autoboxing is not involved here as there is an <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/StringBuilder.html#append%28int%29" rel="noreferrer">StringBuilder.append(int)</a> method which according to the docs is using <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html#valueOf%28int%29" rel="noreferrer">String.valueOf(int)</a> to create the string representation of the integer.</li> </ul>
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1. POString Concatenation and Autoboxing in Java
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1. USbeny23
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1. POString Concatenation and Autoboxing in Java
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