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How many strings are in jvm string pool intern


How many strings are in jvm string pool intern

By : user2957014
Date : November 22 2020, 03:03 PM
hop of those help? Starting with JDK7, you can use the -XX:+PrintStringTableStatistics JVM flag to print information about the size of the string table, such as the number of buckets and the size of a bucket.
You can also use the jmap tool by calling the command jmap -heap *process_id* which would show at the end the number of strings interned and the total size (also requires JDK7+).
code :


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Why only literal strings saved in the intern pool by default?

Why only literal strings saved in the intern pool by default?


By : Toni Pacheco
Date : March 29 2020, 07:55 AM
To fix the issue you can do The short answer: interning literal strings is cheap at runtime and saves memory. Interning non-literal strings is expensive at runtime and therefore saves a tiny amount of memory in exchange for making the common cases much slower.
The cost of the interning-strings-at-runtime "optimization" does not pay for the benefit, and is therefore not actually an optimization. The cost of interning literal strings is cheap and therefore does pay for the benefit.
Garbage collection on intern'd strings, String Pool, and perm-space

Garbage collection on intern'd strings, String Pool, and perm-space


By : Mukesh Kumar
Date : March 29 2020, 07:55 AM
wish of those help String literals are interned. As of Java 7, the HotSpot JVM puts interned Strings in the heap, not permgen.
Prior to java 7, hotspot put interned Strings in permgen. However, interned Strings in permgen were garbage collected. Apparently, Class objects in permgen are also collectable, so everything in permgen is collectable, though permgen collection might not be enabled by default in some old JVMs.
String intern pool as of Java 7

String intern pool as of Java 7


By : Habtamu
Date : March 29 2020, 07:55 AM
hop of those help? Google is your friend.
Summary: Pool has been changed, where it lies now doesn't matter, it still a tool you should not use except for a few special edge cases.
String Constant Pool and intern

String Constant Pool and intern


By : Clive Goff
Date : March 29 2020, 07:55 AM
wish of those help The string pool is being lazily loaded. If you call intern() yourself before the string literal, then that is the version of the string that will go into the string pool. If you do not call intern() yourself, then the string literal will populate the string pool for us.
The surprising part is that we can influence the string pool ahead of the constant pool; as is demonstrated in the code snippets below.
code :
    String c = "qwe";   // string literal qwe goes into runtime cache
    String d = c.substring(1); // runtime string "we" is created
    d.intern();         // intern "we"; it has not been seen 
                        // yet so this version goes into the cache
    String e = "we";    // now we see the string literal, but
                        // a value is already in the cache and so 
                        // the same instance as d is returned 
                        // (see ref below)

    System.out.println( e == d );  // returns true
    String c = "qwe";   // string literal qwe goes into runtime cache
    String d = c.substring(1); // runtime string "we" is created
    String e = "we";    // now we see the string literal, this time
                        // a value is NOT already in the cache and so 
                        // the string literal creates an object and
                        // places it into the cache
    d.intern();         // has no effect - a value already exists
                        // in the cache, and so it will return e

    System.out.println( e == d );  // returns false
    System.out.println( e == d.intern() );  // returns true
    System.out.println( e == d );  // still returns false
Is it possible to read all strings in the intern pool?

Is it possible to read all strings in the intern pool?


By : José Eligio Paredes
Date : March 29 2020, 07:55 AM
wish helps you Looking up the interned strings via code has no use case so it's feature was not added in to the language.
However looking up the strings in memory while debugging a program is a very common use case, and there are tools to do that.
code :
.loadby sos clr
!DumpHeap -strings
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