Help! Compare two Arraylist variables

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Please help me with how to compare two Arraylist variables,

Did everything else right while got no result with the following,

private ArrayList dR;
private double dR1;

dR = new ArrayList();

dR.Add(1):
dR.Add(2);

dR1=(double)dR[1]-(double)dR[0];

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if (dR[0]==dR[1])
{
print("same");
} else
{
print("different");
}