How to make if statement more compact

I was wondering if I could get some help to make my if statements more compact. For example making these if-statements into one if possible with using && or something. The different buttons have different values.

public void actionPerformed(ActionEvent ae) {
    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");
}