How to implement deep clone of an object [duplicate]

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Java: recommended solution for d开发者_StackOverflow社区eep cloning/copying an instance

Using Java, how to implement deep clone of an object?

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There is a way to implement deep clone is using copy constructor technique.

example in this link

Hope this help.

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there are 2 types of copy :

• shallow copy
• deep copy

shallow copy constructs a new instance of your object, but do not constructs new instance for fields your object might have. deep copy constructs a new instance of your object, and constructs new instance for fields your object might have, fields of these, etc.

You can have a look on clone() method of ArrayList for more details : this is a shallow copy. If you want deep copy, you have to clone each element your list contains.

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public class Person {
    private String name;
    private int age;

    // getters and setters.
}

// deep copy:
Person source = new Person("james", 20);
Person dest = new Person();
dest.setName(source.getName());
dest.setAge(source.getAge());