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What difference does an instance make?

Suppose we have a class Worldand we have declared an instance of dreamWorldthis class. How is case 1 different from case 2 except that it is one line shorter? What difference does the instances make in the second case? I mean, after being the dreamWorldsame in both cases, right?

Case 1 :

void changeWorld(World outerWorld) {
    World dreamWorld;

    dreamWorld = outerWorld;
}

Case 2 :

void changeWorld(World outerWorld) {
    World dreamWorld;

    dreamWorld = new World();
    dreamWorld = outerWorld;
}

where outerWorldis the class object Worldcreated elsewhere and, say, provided as an argument to the method (I'm not sure if it matters how it is provided).

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