Question

我正在开展一个有助于确定当前电视频道的项目。主要的输出必须是：

The TV has been created and is tuned to channel 5
The TV is now set to channel 9
The TV is now set to channel 5
The TV is now set to channel 12

这是我到目前为止：请帮助我实现正确的输出。目前我的输出为-99。谢谢

public static void main(String[] args) {
    int channels[] = {5,9,12,19,64};

    NotVeryGoodTv tv = new NotVeryGoodTv(channels);
    tv.turnOn();

    System.out.println("The TV has been created and is tuned to channel " + tv.getCurrentChannel());

    tv.channelUp();
    System.out.println("The TV is now set to channel " + tv.getCurrentChannel());

    tv.channelDown();
    System.out.println("The TV is now set to channel " + tv.getCurrentChannel());

    for (int i = 0; i < 7; i++) {
        tv.channelUp();
    }
    System.out.println("The TV is now set to channel " + tv.getCurrentChannel());
    }




private int [] channels;    // The list of available channels
private int currentChannel; // The index into the channels array of the currently selected channel
private boolean on;         // Whether or not the TV is turned on

/**
 * Constructor.
 * The TV is turned off when it is created here. 
 * @param channels The list of available channels that the TV can be tuned to
 */
public NotVeryGoodTv(int[] channels) {
    on = true; 
    currentChannel=5; 



}

/**
 * Get the channel to which the TV is currently tuned
 * @return The channel to which the TV is currently tuned
 */
public int getCurrentChannel() {
    // finish this

    return -99;     
}
/**
 * Set the TV to a specific channel
 * @param channel The channel index in the array of channels. NOT the channel number. 
 */
public void setCurrentChannel(int currentChannel) {
    // finish this
}

/**
 * Tune the TV to the next available channel.
 * If the TV is not turned on, this method will do nothing.
 * If the TV is already tuned to the highest channel, wrap around to the lowest channel.
 */
public void channelUp(){
    // finish this
}

/**
 * Tune the TV to the previous channel
 * If the TV is not turned on, this method will do nothing.
 * If the TV is already tuned to the lowest channel, wrap around to the highest        channel.
 */
public void channelDown(){
    // finish this
}

/**
 * Turn the TV on
 */
public void turnOn() {
    // finish this
}

/**
 * Turn the TV off
 * When it's off, you can't change channels or retrieve the current channel.
 */
public void turnOff() {

}

/**
 * Check the on/off status of the TV
 * @return true is the TV is currently turned on
 */
public boolean isOn() {
    boolean status = false;
    if (isOn())
        return true; 
    return status;
}

Answer 1

我认为这可能是原因：

public int getCurrentChannel() {
    // finish this

    return -99;     
}

祝你的作业好运。

（你应该至少尝试来实现这一点，如果你遇到某个地方问一个关于该部分的具体问题，我保证你将在这里获得答案在SO。）

用于检测当前电视频道的Java程序

1 个答案: