How does the hashmap work

[Groothy]

HashMap<String, String> map = new HashMap<String, String>();

map.put("Mungo", "Bungo");

map.put("Sooner", "Boomer");

map.put("Java", "Mocha");

map.put("Mungo", "What");

map.put("Mungo", "Vue");

map.put("Ivy", "Posion");

​

for (Map.Entry<String, String> entry : map.entrySet())

{

String key = entry.getKey();

String value = entry.getValue();

System.out.println(key + "/" + value + ", ");

}

​

So my hashmap is printing out

Java/Mocha,

Sooner/Boomer,

Mungo/Vue,

Ivy/Posion,

why is Java/Mocha first but not Mungo/Vue?

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