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Objects in Java are independent entities that encapsulate state and behavior, and are composed of data (state) and methods (behavior). The creation and deletion of objects is managed by the garbage collector, and their lifetime depends on reachability. The member variables and methods of an object can be accessed through the . operator. The benefits of objects include encapsulation, modularity, and polymorphism.
Objects in Java
What are objects?
In the Java language, an object is an independent entity that encapsulates state and behavior. It contains a set of related data and methods to operate on it.
Composition of an object
An object consists of two parts:
Creation of objects
Use the new
keyword to create an object, which allocates memory and calls the object's constructor to initialize it state.
Object life cycle
The creation and deletion of objects is managed by the garbage collector. When the object is no longer reachable, it will be automatically released.
Accessing the object
You can access the member variables and methods of the object by using the .
operator:
<code class="java">// 访问对象变量 myObject.data; // 调用对象方法 myObject.doSomething();</code>
Objects and classes
Benefits of objects
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