宋建邦之java售饭机之有限状态机

// TODO 自动生成方法存根
        if (!bInsert)
            return;

        if(sum+temp*100 > 100000)
            return;
        String command = e.getActionCommand();
        System.out.println(command);
        switch (status) {
        case S_INIT:
        case S_ADD:
            if (command.charAt(0) >= '0' && command.charAt(0) <= '9') {
                temp = temp * 10 + Integer.parseInt(command);
                break;
            }
            sum += temp*100;
            temp = 0;
            if (command == "+") {
                return;
            }
            if (command == "-") {
                status = S_SUB;
                return;
            }
            if (command == ".") {
                dec = "0.";
                status = S_ADD_POINT;
                return;
            }
        case S_SUB:
            if (command.charAt(0) >= '0' && command.charAt(0) <= '9') {
                temp = temp * 10 - Integer.parseInt(command);
                break;
            }
            sum += temp*100;
            temp = 0;
            if (command == "+") {

                status = S_ADD;
                return;
            }
            if (command == "-") {

                return;
            }
            if (command == ".") {
                dec = "-0.";
                status = S_SUB_POINT;
                return;
            }
        case S_ADD_POINT:
            if (command.charAt(0) >= '0' && command.charAt(0) <= '9') {
                if(dec.length() >= 4)
                    break;
                dec += command;
                break;
            }
            if (command == "+") {
                String str = String.valueOf((Double.parseDouble(dec)*100));
                sum += Integer.parseInt(str.substring(0, str.lastIndexOf('.')));
                dec = null;
                status = S_ADD;
                return;
            }
            if (command == "-") {
                String str = String.valueOf((Double.parseDouble(dec)*100));
                sum += Integer.parseInt(str.substring(0, str.lastIndexOf('.')));
                dec = null;
                status = S_SUB;
                return;
            }
            break;
        case S_SUB_POINT:
            if (command.charAt(0) >= '0' && command.charAt(0) <= '9') {
                if(dec.length() >= 5)
                    break;
                dec += command;
                break;
            }
            if (command == "+") {
                String str = String.valueOf((Double.parseDouble(dec)*100));
                sum += Integer.parseInt(str.substring(0, str.lastIndexOf('.')));
                dec = null;

                status = S_ADD;
                return;
            }
            if (command == "-") {
                String str = String.valueOf((Double.parseDouble(dec)*100));
                sum += Integer.parseInt(str.substring(0, str.lastIndexOf('.')));
                dec = null;

                status = S_SUB;
                return;
            }
            break;
        }
        int t = 0;
        if (dec != null){
            String str = String.valueOf((Double.parseDouble(dec)*100));
            t = (sum + temp *100+Integer.parseInt(str.substring(0, str.lastIndexOf('.'))));
            if(balance - t < 0||t<0){
                JOptionPane.showMessageDialog(this, "余额不足!");
                reset();
                sCurrent.display(0);
                sBalance.display(balance);
                return;
            }
            sCurrent.display(t);
            sBalance.display(balance - t);
        }
        else{
            t = sum + temp * 100;
            if(balance - t < 0 || t<0){
                JOptionPane.showMessageDialog(this, "余额不足!");
                reset();
                sCurrent.display(0);
                sBalance.display(balance);
                return;
            }
            sCurrent.display(t);
            sBalance.display(balance - t);
        }