要获取包含自定义对象的ArrayList行的索引，可以使用以下方法：

1. 在自定义对象类中，重写equals()方法和hashCode()方法，以确保对象之间的比较是基于其内容而不是引用。

public class CustomObject {
    private String name;
    private int age;

    // 构造函数、getter和setter方法

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        CustomObject that = (CustomObject) o;
        return age == that.age && Objects.equals(name, that.name);
    }

    @Override
    public int hashCode() {
        return Objects.hash(name, age);
    }
}

2. 创建一个ArrayList，并添加自定义对象的实例。

ArrayList list = new ArrayList<>();
list.add(new CustomObject("John", 25));
list.add(new CustomObject("Jane", 30));
list.add(new CustomObject("Tom", 35));

3. 使用indexOf()方法来查找包含特定自定义对象的行的索引。

CustomObject object = new CustomObject("Jane", 30);
int index = list.indexOf(object);
System.out.println("Index: " + index);

完整示例代码如下：

import java.util.ArrayList;
import java.util.Objects;

public class Main {
    public static void main(String[] args) {
        ArrayList list = new ArrayList<>();
        list.add(new CustomObject("John", 25));
        list.add(new CustomObject("Jane", 30));
        list.add(new CustomObject("Tom", 35));

        CustomObject object = new CustomObject("Jane", 30);
        int index = list.indexOf(object);
        System.out.println("Index: " + index);
    }
}

class CustomObject {
    private String name;
    private int age;

    public CustomObject(String name, int age) {
        this.name = name;
        this.age = age;
    }

    // getter and setter methods

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        CustomObject that = (CustomObject) o;
        return age == that.age && Objects.equals(name, that.name);
    }

    @Override
    public int hashCode() {
        return Objects.hash(name, age);
    }
}

运行上述代码，将输出：

Index: 1

这表示自定义对象"Jane"（年龄为30）在ArrayList中的索引为1。