ByAll其實是一個儲存By的一個數組類，因為實現了java.io.Serializable方法所以可以用作遠端控制。

import org.openqa.selenium.By;
import org.openqa.selenium.NoSuchElementException;
import org.openqa.selenium.SearchContext;
import org.openqa.selenium.WebElement;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
public class ByAll extends By implements Serializable {

  private static final long serialVersionUID = 4573668832699497306L;

  private By[] bys;

  public ByAll(By... bys) {
    this.bys = bys;
  }

  @Override
  public WebElement findElement(SearchContext context) {
    for (By by : bys) {
      List<WebElement> elements = context.findElements(by);
      if (!elements.isEmpty()) {
        return elements.get(0);
      }
    }
    throw new NoSuchElementException("Cannot locate an element using " + toString());
  }

  @Override
  public List<WebElement> findElements(SearchContext context) {
    List<WebElement> elems = new ArrayList<>();
    for (By by : bys) {
      elems.addAll(context.findElements(by));
    }

    return elems;
  }

  @Override
  public String toString() {
    StringBuilder stringBuilder = new StringBuilder("By.all(");
    stringBuilder.append("{");

    boolean first = true;
    for (By by : bys) {
      stringBuilder.append((first ? "" : ",")).append(by);
      first = false;
    }
    stringBuilder.append("})");
    return stringBuilder.toString();
  }

}