java 对于存储的每个对象引用，调用对象方法

Question

我需要一些帮助。我想打印 phone 对象和每个 phone 对象特定的方法。我创建了一个 List 并且对于每个循环我还有一个 toString() 方法打印下面的 Output 我想做的是在特定的 phone 上调用方法 streamVideo对象名称：G200 使用 toString()。

public void streamVideo() {
        System.out.println("Streaming");
}

输出

 Name: LandLine 2000
 No of pixels: 400
 Width: 5.6
 Height: 8.5
 Weight: 80.5
 Powered On: true
 Recharging: false
 Streaming: Streaming at index:0 **// wrong**

 Name: G200
 No of pixels: 510
 Width: 4.5
 Height: 8.6
 Weight: 80.5
 Powered On: true
 Recharging: false
 Streaming: Streaming at index:1 **// what I want**

List<Phone> phones = new ArrayList<>();

    Phone landLine2000 = new Phone("LandLine 2000",400,5.6f,8.5f,80.5f,true,false);
    Phone g200 = new Phone("G200",510,4.5f,8.6f,80.5f,true,false);


    phones.add(landLine2000);
    phones.add(g200);

    int index = 0;
    for (Phone phone : phones) 
    {   
        System.out.println(phone + " at index:" + (index++));
    }

    System.out.println();   

@Override
public String toString()
{
    return ("\n Name: " + getName() +
            "\n No of pixels: " + getNoOfDisplayPixels() + 
            "\n Width: " + getWidth() +
            "\n Height: " + getHeight() +
            "\n Weight: " + getWeight() +
            "\n Powered On: " + getIsPoweredOn() +
            "\n Recharging: " + getIsRecharging() +
            "\n Streaming: " + getStreamVideo() // Don't want to use get
    );
}

Answer 1

what I want to do is call a method streamVideo on a specific phone object Name: G200 using toString().

@Override
public String toString()
{
    String str = "not Streaming";
    //check whether the name is G200 or not.
    if(getName().equals("G200"))
        str="Streaming";

    return ("\n Name: " + getName() +
            "\n No of pixels: " + getNoOfDisplayPixels() + 
            "\n Width: " + getWidth() +
            "\n Height: " + getHeight() +
            "\n Weight: " + getWeight() +
            "\n Powered On: " + getIsPoweredOn() +
            "\n Recharging: " + getIsRecharging() +
            "\n Streaming: " +str  // Don't want to use get
    );
}

java 对于存储的每个对象引用，调用对象方法

java For each object reference stored, call the object methods

java

foreach

list

object

tostring