bt a2dp headphone
时间: 2023-11-03 22:04:57 浏览: 38
BT A2DP headphones refer to Bluetooth headphones that support the Advanced Audio Distribution Profile (A2DP). A2DP is a Bluetooth profile that enables wireless streaming of high-quality audio from a source device such as a smartphone, tablet, or laptop to a compatible receiving device such as headphones or speakers. A2DP headphones are popular among users who want to enjoy wireless audio while on the go or during workouts. They typically have good battery life, range, and sound quality, making them a convenient and practical choice for many people.
相关问题
bt a2dp headphone 是什么
BT A2DP是指蓝牙音频分发协议(Advanced Audio Distribution Profile),它是一种用于传输高质量音频的蓝牙协议。它允许音频从一个蓝牙设备(如手机、平板电脑或电脑)流式传输到一个支持A2DP的蓝牙耳机或扬声器。因此,BT A2DP耳机是一种能够接收和播放通过A2DP协议传输的高质量音频的蓝牙耳机。
( 1 )编写HeadPhone (耳机)类,包含brand (品牌)和price属性,该类实现Comparable接口规定该类对象大小,即手机按照价格来排序。( 2 )创建一个只可以放HeadPhonee类的链表,链表当中添加3个HeadPhone对象,依次次遍历每个对象.并在屏墓卜输出排序前链去中的数据.( 3 )调用Collections的sort0方法将链表当中的对象按price值排序;并在屏幕上输出排序后链表中的数据;( 4 )调用Collections的binarySearch ( )方法,查找当前对象的price的值是否和链表当中的某一个对象的price的值相同,若有,屏幕上输出对应的下标值;
好的,以下是对您的问题的回答:
(1) HeadPhone类实现如下:
```java
public class HeadPhone implements Comparable<HeadPhone>{
private String brand;
private double price;
public HeadPhone(String brand, double price){
this.brand = brand;
this.price = price;
}
public String getBrand() {
return brand;
}
public void setBrand(String brand) {
this.brand = brand;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
@Override
public int compareTo(HeadPhone o) {
if (this.price > o.getPrice()){
return 1;
}else if (this.price < o.getPrice()){
return -1;
}else{
return 0;
}
}
}
```
(2) 创建只能放HeadPhone类的链表,并添加3个对象,遍历并输出排序前链表中的数据:
```java
public static void main(String[] args) {
List<HeadPhone> headPhoneList = new LinkedList<>();
headPhoneList.add(new HeadPhone("Sony", 99.99));
headPhoneList.add(new HeadPhone("Bose", 199.99));
headPhoneList.add(new HeadPhone("Sennheiser", 149.99));
System.out.println("排序前链表中的数据:");
for (HeadPhone headPhone : headPhoneList) {
System.out.println(headPhone.getBrand() + ": " + headPhone.getPrice());
}
}
```
输出结果为:
```
排序前链表中的数据:
Sony: 99.99
Bose: 199.99
Sennheiser: 149.99
```
(3) 使用Collections的sort方法对链表中的对象按price值排序,并输出排序后链表中的数据:
```java
Collections.sort(headPhoneList);
System.out.println("排序后链表中的数据:");
for (HeadPhone headPhone : headPhoneList) {
System.out.println(headPhone.getBrand() + ": " + headPhone.getPrice());
}
```
输出结果为:
```
排序后链表中的数据:
Sony: 99.99
Sennheiser: 149.99
Bose: 199.99
```
(4) 使用Collections的binarySearch方法查找当前对象的price值是否和链表中的某一个对象的price值相同,若有,输出对应的下标值:
```java
double priceToSearch = 149.99;
int index = Collections.binarySearch(headPhoneList, new HeadPhone("", priceToSearch));
if (index >= 0){
System.out.println("价格为" + priceToSearch + "的耳机在链表中的下标为:" + index);
}else{
System.out.println("价格为" + priceToSearch + "的耳机不在链表中。");
}
```
输出结果为:
```
价格为149.99的耳机在链表中的下标为:1
```
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