Description Wang Zehao 2017-05-21 09:23:08 EDT

import java.util.Random;

public class Main {
	public static void main(String[] args) {
1		System.out.println(new Random(1L).nextLong());
2		System.out.println(new Random(1L).nextLong());
	}
}

Above is the target code.
Below is what I did.
1. I select "new Random(1L)" in line 1
2. click Refactor->Extract Local Variable,variable name random

Below is the result of refactoring.

import java.util.Random;

public class Main {
	public static void main(String[] args) {
		Random random = new Random(1L);
		System.out.println(random.nextLong());
		System.out.println(random.nextLong());
	}
}

Below is what I expected.

import java.util.Random;

public class Main {
	public static void main(String[] args) {
		Random random = new Random(1L);
		System.out.println(random.nextLong());
		System.out.println(new Random(1L).nextLong());
	}
}

This refactor change the "new Random(1L)" in line 2 too,so the program will not work correctlly.

Here is the output of this program

before refactoring:

-4964420948893066024
-4964420948893066024

after refactoring:

-4964420948893066024
7564655870752979346

I think this is a very serious bug. It break the correctness of the code