Modifying duplicate if-else statements into a cleaner code

Im making a calculator Gui. Is there any way to make this code look cleaner without duplicating lines.

double num1, num2, ans, doub;
num1 = Double.parseDouble(FirstInput.getText());
num2 = Double.parseDouble(SecondInput.getText());
oper = (Operator.getText());

if(oper.equals("+")){
    ans = num1 + num2;
    doub = Math.round(ans * 100000.0) / 100000.0;
    if(doub == (int) ans){
        Answer.setText(Integer.toString((int) ans));
    } else{
        Answer.setText(Double.toString(doub));
    }
}
if(oper.equals("-")){
    ans = num1 - num2;
    doub = Math.round(ans * 100000.0) / 100000.0;
    if(doub == (int) ans){
        Answer.setText(Integer.toString((int) ans));
    } else{
        Answer.setText(Double.toString(doub));
    }
}
if(oper.equals("/")){
    ans = num1 / num2;
    doub = Math.round(ans * 100000.0) / 100000.0;
    if(doub == (int) ans){
        Answer.setText(Integer.toString((int) ans));
    } else{
        Answer.setText(Double.toString(doub));
    }
}
if(oper.equals("x")){
    ans = num1 * num2;
    doub = Math.round(ans * 100000.0) / 100000.0;
    if(doub == (int) ans){
        Answer.setText(Integer.toString((int) ans));
    } else{
        Answer.setText(Double.toString(doub));
    }
}