当比较两个值时，它显示字符串索引超出范围：-1

Question

我想要从 flipkart 和亚马逊网站比较的商品的最低价格。我正在这两个网站上搜索特定的手机    public static void main(String arg[]) throws InterruptedException {        ArrayList<String[]> data1 = new ArrayList<String[]>();        String[] entriesArr = null;        String[] entriesArr1 = null;  System.setProperty("webdriver.chrome.driver","C:\\Seleniumjava\\driver\\chromedriver.exe");           WebDriver driver = new ChromeDriver();                   driver.manage().timeouts().implicitlyWait(20,TimeUnit.SECONDS);        //open flipkart          driver.get("https:/www.flipkart.com");//xpath for close the popup           driver.findElement(By.xpath("//button[text()='✕']")).click();                    driver.findElement(By.xpath("//div[@class='O8ZS_U']/input")).sendKeys("Redmi 7 ( 32 MB , 2 GB ) Black");                    driver.findElement(By.xpath("//div[@class='O8ZS_U']/input")).sendKeys(Keys.ENTER);                    List<WebElement> phonenames = driver.findElements(By.xpath("//div[@class='_3wU53n']"));                    List<WebElement> phoneprice = driver.findElements(By.xpath("//div[@class='_1vC4OE _2rQ-NK']"));                    for( int i=0;i<phonenames.size();i++)                    {                        if(phonenames.get(i).getText().contains("Redmi 7 (Eclipse Black, 32 GB)"))                         {                            entriesArr = new String[]{phonenames.get(i).getText().toString(), phoneprice.get(i).getText().toString() };                            data1.add(entriesArr);                        }                    }当我运行我的代码时，它显示 String index out of range: -1 in the line int value = Integer.parseInt(data.get(i)[1].substring(1).replace(",", "")) ;

Answer 1

我添加了一些sleep for wait a load page enter click后，你错误的选择了一个定位器By.xpath("//span[@class='a-offscreen']")，定位器没有给出任何文本=""，所以当你使用.substring(1)它时会导致错误String index out of range: -1，请试试下面的代码。

public static void main(String arg[]) throws InterruptedException {

    ArrayList<String[]> data1 = new ArrayList<String[]>();

    String[] entriesArr = null;

    String[] entriesArr1 = null;  

    System.setProperty("webdriver.chrome.driver","C:\\Seleniumjava\\driver\\chromedriver.exe");

    WebDriver driver = new ChromeDriver();

    driver.manage().timeouts().implicitlyWait(20,TimeUnit.SECONDS);

    //open flipkart

    driver.get("https://www.flipkart.com");

    //xpath for close the popup

    driver.findElement(By.xpath("//button[text()='✕']")).click();

    driver.findElement(By.xpath("//div[@class='O8ZS_U']/input")).sendKeys("Redmi 7 ( 32 MB , 2 GB ) Black");

    driver.findElement(By.xpath("//div[@class='O8ZS_U']/input")).sendKeys(Keys.ENTER);

    //I'm edit here

    Thread.sleep(5000);

    List<WebElement> phonenames = driver.findElements(By.xpath("//div[@class='_3wU53n']"));

    List<WebElement> phoneprice = driver.findElements(By.xpath("//div[@class='_1vC4OE _2rQ-NK']"));

    for( int i=0;i<phonenames.size();i++){

        if(phonenames.get(i).getText().contains("Redmi 7 (Eclipse Black, 32 GB)")) {

            entriesArr = new String[]{phonenames.get(i).getText().toString(), phoneprice.get(i).getText().toString() };

            data1.add(entriesArr);

        }

    }

    driver.close();

    System.setProperty("webdriver.chrome.driver","C:\\Seleniumjava\\driver\\chromedriver.exe");

    WebDriver driver1 = new ChromeDriver();

    driver1.manage().timeouts().implicitlyWait(20,TimeUnit.SECONDS);

    //open amazon site

    driver1.get("https:/www.amazon.in");

    driver1.findElement(By.xpath("//input[@id='twotabsearchtextbox']")).sendKeys("Redmi 7 ( 32 MB , 2 GB ) Black");

    driver1.findElement(By.xpath("//input[@id='twotabsearchtextbox']")).sendKeys(Keys.ENTER);

    Thread.sleep(3000);

    List< WebElement> phonenames2 = driver1.findElements(By.xpath("//a//span[@class='a-size-medium a-color-base a-text-normal']"));

    //I'm edit here

    List< WebElement> phoneprice1 = driver1.findElements(By.xpath("//*[@class='a-price' and @data-a-size='l']"));

    for( int j=0;j<phonenames2.size();j++) {

        if(phonenames2.get(j).getText().contains("Redmi 7 (Eclipse Black, 2GB RAM, 32GB Storage)")) {

            entriesArr1 = new String[]{phonenames2.get(j).getText().toString(), phoneprice1.get(j).getText().toString() };

            data1.add(entriesArr1);

        }

    }

    driver1.close();

    String[] d = getMinPhonePrice(data1);

    System.out.println(d[0] + ", " + d[1]);

}

//method for minimum phone price

public static String[] getMinPhonePrice(ArrayList<String[]> data){

    int value_min = Integer.parseInt(data.get(0)[1].substring(1).replace(",", ""));

    String key_min="";

    for(int i=1;i<data.size();i++) {

        int value = Integer.parseInt(data.get(i)[1].substring(1).replace(",", ""));

        if(value < value_min) {

            value_min=value;

            key_min=data.get(i)[0];

        }

    }

    String[] d = {key_min,String.valueOf(value_min)};

    return d;

}