How to get the difference between two simple objects?

[franzisk]

Sorry but I didn't get the point here.

Let's say I have two simple objects and I need to know if there is a difference between them and if there is I need to know where and I also need to know the previous value of that field and the new value.

Let's get this as an example:

Person person1 = new Person();
person1.setName("Freddy");
person1.setAge(22);

Person person2 = new Person();
person2.setName("Christoph");
person2.setAge(22);

What I want to achieve here is:

• it was changed: yes
• the attribute changed was "name"
• the previous value was "Freddy"
• the current value is "Christoph"

Any help on that?

[kissss]

You can do this

    Person person1 = new Person();
        person1.setName("Freddy");
        person1.setAge(22);
        Person person2 = new Person();
        person2.setName("Christoph");
        person2.setAge(22);

        DiffNode diff = ObjectDifferBuilder.startBuilding()
                .inclusion().exclude()
//                .propertyName("name")
                .and().build().compare(person1, person2);
        diff.visit((node, visit) -> {
            final Object baseValue = node.canonicalGet(person1);
            final Object workingValue = node.canonicalGet(person2);
            final String message = node.getPath() + " changed from " + baseValue + " to " + workingValue + " change state " + node.getState();
            System.out.println(message);
        });
        System.out.println(diff.hasChanges());

you should read https://java-object-diff.readthedocs.io/en/latest/user-guide/

[kissss]

@franzisk

[luongbaotin7777]

@franzisk

You can do this

    Person person1 = new Person();
        person1.setName("Freddy");
        person1.setAge(22);
        Person person2 = new Person();
        person2.setName("Christoph");
        person2.setAge(22);

        DiffNode diff = ObjectDifferBuilder.startBuilding()
                .inclusion().exclude()
//                .propertyName("name")
                .and().build().compare(person1, person2);
        diff.visit((node, visit) -> {
            final Object baseValue = node.canonicalGet(person1);
            final Object workingValue = node.canonicalGet(person2);
            final String message = node.getPath() + " changed from " + baseValue + " to " + workingValue + " change state " + node.getState();
            System.out.println(message);
        });
        System.out.println(diff.hasChanges());

you should read https://java-object-diff.readthedocs.io/en/latest/user-guide/

hi Bro, how about for child Object into parent object changes? please help me, thank bro very much.!

[zaknafein83]

You can do this

    Person person1 = new Person();
        person1.setName("Freddy");
        person1.setAge(22);
        Person person2 = new Person();
        person2.setName("Christoph");
        person2.setAge(22);

        DiffNode diff = ObjectDifferBuilder.startBuilding()
                .inclusion().exclude()
//                .propertyName("name")
                .and().build().compare(person1, person2);
        diff.visit((node, visit) -> {
            final Object baseValue = node.canonicalGet(person1);
            final Object workingValue = node.canonicalGet(person2);
            final String message = node.getPath() + " changed from " + baseValue + " to " + workingValue + " change state " + node.getState();
            System.out.println(message);
        });
        System.out.println(diff.hasChanges());

you should read https://java-object-diff.readthedocs.io/en/latest/user-guide/

not work for me, i copy/paste your code.
Could be because i use lombok

@Data
@Accessors(fluent = true)
@Builder