在Java类中打印字段的所有值的最佳方法是什么

Question

I have a class called Product with some fields. I want to print all the values for a product object.

Class Product{

 String code;
 String description;

}

Product p = new product();
p.setCode("C");
p.setDescription("desc");

I want to print values of product instances ex

Code:C Description:Desc.

I have around 100 classes with lot of fields in all the classes.What is the best way.

Answer 1

You'll want to override the toString() method in java.lang.Object.

If you use Eclipse, you can autogenerate a toString method that does what you want. Here's a good example of how to do that:

http://idiot2genius.wordpress.com/2011/05/17/eclipse-generate-java-tostring-method-quickly/

There's a very useful class in the Apache Commons Lang project that you might find helpful as well:

http://commons.apache.org/lang/api-2.4/org/apache/commons/lang/builder/ToStringBuilder.html

Answer 2

如果您不想手工构建字符串或手动管理更改，则可以考虑使用类似于Commons Lang ReflectionToStringBuilder.reflectionToString()方法的方法，该方法也可以通过ToStringBuilder类获得。