将值设置为原始类型字段

Question

This is the first time that I'm working with reflection and I have the following trouble.

I have this class

public class MyObject {

    private String description;

    private int number;

    private double value;


    //Constructor getter and setter
}

Now I'm trying to set the values of the MyObject's fields.

    Class c = Class.forName("myPackage.MyObject");
    Field [] fields = c.getDeclaredFields();


    for(Field field: fields){

         if(f.getType().equals(Double.class)){
        //Do somethings
        }
        else if(f.getType().equals(Integer.class)){
        //Do somethings
        }
        else{
        //Do somethings
        }


    }
}

but I'm never able to filter int and double type.

How can I fix it?

Answer 1

That is because Double is not double . Try this instead

 if(f.getType() == double.class){
    //Do somethings

 } else if(f.getType() == int.class){
    //Do somethings

 } else {
    //Do somethings
 }

A simple way to prove this to yourself is

 System.out.println(f.getType());

Answer 2

Double.class refers to the wrapper class, java.lang.Double . The primitive double is referenced by Double.TYPE .

Similarly, you also have Integer.TYPE , Long.TYPE , etc.