How to Efficiently Initialize Multiple Variables in Java with the Same Value?

Elegant Initialization of Multiple Variables in Java

Java developers frequently encounter situations where they need to initialize multiple variables of the same type and value. Traditionally, this is achieved by declaring each variable separately, as seen in the following example:

String one = "", two = "", three = "" etc...

While this method is functional, it can become冗长 and inefficient when dealing with a large number of variables. To address this issue, some developers may consider using a simplified syntax, such as:

String one, two, three = ""

However, this syntax is not valid in Java.

Efficient and Immutable Solution

To achieve the desired functionality while maintaining efficiency, the following technique is recommended:

String one, two, three;
one = two = three = "";

This method initializes all three variables of type String to the same value of an empty string (""). By assigning values to variables in this manner, Java performs a single initialization, rather than initializing each variable individually.

Considerations with Mutable Objects

It is important to note that this technique only works effectively with immutable objects like strings. For mutable objects, such as those of class Person, using the above syntax would result in all variables pointing to the same instance.

To properly handle multiple references to mutable objects, it is recommended to create separate instances for each variable, as shown below:

Person firstPerson = new Person();
Person secondPerson = new Person();
Person thirdPerson = new Person();

Alternatively, an array or Collection can be used to manage multiple references to mutable objects.

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