Can't give arguments to a method.

[cursive owl]

So I have a variable I want to give as the argument of my method. It goes as follow:

public void method1() {
  List<Vertex> MSTGraph = ...; // actual code for this but isn't relevant
  System.out.println("VERTICES EDGES LIST #0");
  for (Vertex vertex : MSTGraph) {
      ArrayList<String> connectedVerticesLabels = new ArrayList<>();
      for (Vertex vertexEdge : vertex.getEdges().keySet()) {
          connectedVerticesLabels.add(vertexEdge.getLabel());
      }
      System.out.println("Vertex #" + vertex.getLabel() + " " + connectedVerticesLabels);
  }
  method(MSTGraph)
}


public List<Vertex> method(List<Vertex input) {
    System.out.println("VERTICES EDGES LIST");
    for (Vertex vertex : MST) {
        ArrayList<String> connectedVerticesLabels = new ArrayList<>();
        for (Vertex vertexEdge : vertex.getEdges().keySet()) {
            connectedVerticesLabels.add(vertexEdge.getLabel());
        }
        System.out.println("Vertex #" + vertex.getLabel() + " " + connectedVerticesLabels);
    }
}

Here are the outputs:

[elfin obsidian]

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[cursive owl]

actual screenshots of the code if you want:

[rose plank]

what/where's the actual issue here

[cursive owl]

the output is different

Both methods should return exactly the same thing since they have the same code and the same variable to work with

but for some reason it doesn't

[rose plank]

how do you know it's the same list to work with

oh wait i was gonna suggest adding a method call but i just noticed that lmao

[cursive owl]

Why would it be different?
I do nothing to change it in this part of the code

[rose plank]

blind on mobile moment

[cursive owl]

😎

[rose plank]

different lists passed, if the call had been omitted here, but nah i was just blind lol

ah wait

you aren't using the same list

[cursive owl]

just tried that and still doesn't work

[rose plank]

you're using MST instead of the passed input

in the loop

[cursive owl]

MST isthe passed input?

[rose plank]

it isn't though?

[cursive owl]

the method getPerfectMatching() does change the mst

maybe that's the issue (though I doubt it because when passing a variable isn't it creating a new instance of it?)

didn't work

[cursive owl]

UPDATE:
by change the second argument to simply input instead of getPerfectMatching(MSTGraph)
I don't have the error

So yeah I just need to clone it