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I'm aware if you make
for (condition) {
String s = "hi there";
}
Just one String instance is created in all the iterations, unlike String s = new String("hi there"); that will create a new instance in each iteration.
But, reading Effective Java from Joshua Bloch: Chapter 2 Item 5 (page 20) it states:
Furthermore, it is guaranteed that the object will be reused by any other code running in the same virtual machine that happens to contain the same string literal [JLS, 3.10.5].
AFAIK that does not say happens to be the same string literal, it says contains.
Reading [JLS, 3.10.5] cannot find any exact reference to this and I have a doubt.
Giving this snippet:
String s1 = "hi ";
String s2 = "there";
String s3 = "hi there";
How many instances are created?
s1 and s2 (then s3 is created reusing s1 and s2 references)
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By reusable, it is meant that, when you want to use another String with exactly the same characters and encoding, a new String object is not created. Instead, the reference will point to the already existing String in the string pool. This is called interning. This can be done because String s are immutable in Java.
Simple answer: yes. However, the string or strings you reuse are going to be poorer in quality and sound than a new one. Used strings will be worn, have lost some of their tone and probably sound dull and flat.
In Java, strings are stored in the heap area.
From Java 7 onwards, the Java String Pool is stored in the Heap space, which is garbage collected by the JVM.
The JLS does not guarantee any reuse of sub-strings whatsoever. The "contain" here is just meant that the class mentions the exact same string literal somewhere. It is not used in the "substring of" sense.
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