Counting String objects created by Java code

Question

How many String objects are created by the following code?

String x = new String(\"xyz\");
String y = \"abc\";
x = x + y;

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Answer 1

The answer is 5

1. xyz in non pool memory
2. xyz in pool memory with no reference
3. abc in pool memory with reference
4. xyz still in non pool memory, reference changed to xyzabc in non pool memory
5. xyzabc in pool memory with no reference