Java BeanUtils.populate: Usage Explained

1 year ago
Liam
1 minute

In Java, the BeanUtils.populate() method is used to copy property values from a Map object to a JavaBean object.

Here is how it is used:

public static void populate(Object bean, Map<String, ? extends Object> properties)
  throws IllegalAccessException, InvocationTargetException

Explanation of parameters:

  1. bean: JavaBean object to be manipulated
  2. properties: a Map object containing property names and values, i.e., the values of the properties to be copied into the JavaBean object.

This method can be used to set the property values of a JavaBean object in bulk using a Map object, without the need to do it one by one. For example:

Map<String, Object> map = new HashMap<>();
map.put("name", "John");
map.put("age", 30);

Person person = new Person();
BeanUtils.populate(person, map);

In the above code, copy the property values (name and age) from the map object to the person object.

It is important to note that the BeanUtils.populate() method utilizes the reflection mechanism of Java to manipulate JavaBean objects, thus requiring the JavaBean object’s properties to have corresponding setter methods.

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