I'll change features as following.

• Allow to overwrite the constant pool.

Is it correct?

@chitoku-k

@memory-agape Probably that should make sense. For clarification,

1. Allow String#intern() to overwrite the constant pool.
2. Any literals that appear after the write operation will refer to (1).

And, please have a look at #120 as well.

@chitoku-k
Thanks 👍
I'll try to implement.

@chitoku-k
You can add new tests.

OK, I found a ridiculous edge case that isn't covered.

Whereas the following prints the expected result,

String te = "te";
String st = "st";
String test = te + st;

System.out.println(System.identityHashCode(test)); // => 356573597

test.intern();
System.out.println(System.identityHashCode("test")); // => 356573597

the interning does not happen in JVM when a literal has already appeared in that scope:

String te = "te";
String st = "st";
String test = te + st;

System.out.println(System.identityHashCode(test))  // => 356573597

// This line is added to make a literal appear before interned
String dummy = "test";

test.intern();
System.out.println(System.identityHashCode("test")); // => JVM: 1735600054, PHPJava: 356573597

Adding the failing test...

Very sad (T_T)

I think this PR finally got ready for reviewing!

@chitoku-k
Looks good to me!
Please merge this PR after fixing conflicted files.