If-statements more consise

Is it possible to make this more consise by combinding if-statements with && or something else? I've tried a lot and I cant seem to make it work. If I could get any example on one or two rows of the code I would be very thankful.

public void actionPerformed(ActionEvent ae) {
    if (ae.getSource() == button[0])
        display.append("7");
    if (ae.getSource() == button[1])
        display.append("8");
    if (ae.getSource() == button[2])
        display.append("9");

    if (ae.getSource() == button[3]) {
        temporary[0] = Double.parseDouble(display.getText());
        function[0] = true;
        display.setText("");
    }
    if (ae.getSource() == button[4])
        display.append("4");
    if (ae.getSource() == button[5])
        display.append("5");
    if (ae.getSource() == button[6])
        display.append("6");
    if (ae.getSource() == button[7]) {

        temporary[0] = Double.parseDouble(display.getText());
        function[1] = true;
        display.setText("");
    }
    if (ae.getSource() == button[8])
        display.append("1");
    if (ae.getSource() == button[9])
        display.append("2");
    if (ae.getSource() == button[10])
        display.append("3");
    if (ae.getSource() == button[11]) {

        temporary[0] = Double.parseDouble(display.getText());
        function[2] = true;
        display.setText("");
    }
    if (ae.getSource() == button[12])
        display.append(".");
    if (ae.getSource() == button[13]) {

        temporary[0] = Double.parseDouble(display.getText());
        function[3] = true;
        display.setText("");
    }
    if (ae.getSource() == button[14])
        clear();
    if (ae.getSource() == button[15])
        getSqrt();
    if (ae.getSource() == button[16])
        getPosNeg();
    if (ae.getSource() == button[17])
        getResult();
    if (ae.getSource() == button[18])
        display.append("0");
}