java - Why is String.intern() a native method? -

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what's logic behind making method native?

what advantage on making interned string pool hash map?

it looks little strange, seems it'd pretty easy in non-native code:

import java.util.hashmap;  public class string {      // ...      private final static hashmap<string, string> pool = new hashmap<>();      public string intern() {          if (pool.containskey(this))             return pool.get(this);          synchronized (pool) {             if (pool.containskey(this))                 return pool.get(this);             pool.put(this, this);             return this;         }      }      // ...  }

so why native code then?

it seems it'd pretty easy in non-native code ...

you're wrong. specification, string.intern() must interact constant pool, meet requirement 'all literal strings interned'. can't done java code.


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