java - 有什么方法可以在java中传递带有2个输入参数的函数吗？

Question

我怎样才能在java中传递一个类似Function的对象来获取2个或更多参数？

我有这个代码:

public String getSrcAfterWait(final By by) {
    String currentSrc;
    try {
        currentSrc = tryToGetSrc(by);

    } catch (StaleElementReferenceException ex)
    {
        currentSrc = tryToGetSrc(by);
    }
    return currentSrc;
}

private String tryToGetSrc(By by) {
    WebElement webElement = getElementAfterWaitForDisplay2(by);
    String currentSrc = null;
    if (webElement != null) {
        currentSrc = webElement.getAttribute("src");
    }
    return currentSrc;
}

private String tryToGetText(final By by) {
    String currentSrc = null;
    WebElement webElement = getElementAfterWaitForDisplay2(by);
    if (webElement != null) {
        currentSrc = webElement.getText();
    }
    return currentSrc;
}

public String getButtonTextAfterWait(final By by) {
    String currentText;
    try {
        currentText = tryToGetText(by);

    } catch (StaleElementReferenceException ex)
    {
        currentText = tryToGetText(by);
    }
    return currentText;
}

我想这样概括它:

public <T,V> V tryGetAttribute(final By by, Function<T,V> getFunc) {
    WebElement webElement = getElementAfterWaitForDisplay2(by);
    V answer = null;
    if (webElement != null) {
        try {
            answer = getFunc.apply(webElement, getFunc);//
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
    return answer;
}

public String getButtonTextAfterWait(final By by) {
    String currentText;
    Function<WebElement, String> getFunc = webElement -> webElement.getText();
    try {
        currentText = tryGetAttribute(by, getFunc);

    } catch (StaleElementReferenceException ex) {
        currentText = tryGetAttribute(by, getFunc);
    }
    return currentText;
}

但我没有看到任何方法来传递具有 2 个输入参数的函数。

有没有办法抽象或者效率不高？

Answer 1

至少在Java8中，有BiFunction

参见:

https://docs.oracle.com/javase/8/docs/api/java/util/function/BiFunction.html

如果您需要更多参数；是什么阻止您简单地创建自己的“TripleFunction”等等？

另一个选择是定义一个新类，它结合了您必须传递的两个/三个/...参数。