SUMA CON JMENU SIMPLE en 14:47

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private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        double x,y,z,re;
                x=Double.parseDouble(a.getText());
                y=Double.parseDouble(b.getText());
                z=Double.parseDouble(c.getText());
                re=x+y+z;
                r.setText(String.valueOf(re));
       
    }

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        a.setText("");
        b.setText("");
        c.setText("");
        r.setText("");
    }