使用Reflection分配对象字段值的Java方法 [英] Java method to assign object field values with Reflection

问题描述

我想知道是否有可能在Java中使用以下内容：

I was wondering whether it would be possible to have something like the following in Java:

public class MyClass {
    private String name;
    private Integer age;
    private Date dateOfBirth;
    // constructors, getters, setters

    public void setField(String aFieldName, Object aValue) {
        Field aField = getClass().getDeclaredField(aFieldName);
        // use: aField.set(...) with proper type handling
    }
 }

我真的陷入了setField方法，任何想法都会非常有用。

I am really stuck in the setField method and any idea would be very helpful.

谢谢！

编辑：原因是我希望在另一个类中有一个方法，如下所示

The reason for this is that I would like to have a method in another class like the following

public static MyClass setAll(List<String> fieldNames, List<Object> fieldValues) {
    MyClass anObject = new MyClass();
    // iterate fieldNames and fieldValues and set for each fieldName 
    // the corresponding field value
    return anObject;
}

推荐答案

当然：

aField.set(this, aValue);

首先进行类型检查：

if (!aField.getType().isInstance(aValue))
    throw new IllegalArgumentException();

但是因为调用设置的值为错误的类型会生成 IllegalArgumentException 无论如何，这种检查不是很有用。

but since calling set with a value of the wrong type will generate an IllegalArgumentException anyway, that sort of check isn't very useful.

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