How does the object finalization mechanism work in Java memory management?

The object finalization mechanism in Java is implemented through the finalize() method, allowing the object to release resources before being garbage collected. The method is as follows: 1. After the garbage collector marks the object as garbage, it will try to recycle non-static fields. 2. Then call the finalize() method to clean up resources. 3. If finalize() throws an exception, the garbage collector will terminate the collection. This mechanism releases memory when an object is no longer used, but should be used with caution to avoid memory leaks and performance issues.

#How does the object finalization mechanism work in Java memory management?

Overview

Java's garbage collector is responsible for recycling objects that are no longer used, thereby freeing up memory. Object finalization is a mechanism that allows objects to perform cleanup work before being garbage collected.

Method

The object finalization mechanism is implemented through the finalize() method. When an object is marked as garbage, the garbage collector attempts to reclaim all its non-static fields before calling the finalize() method. If the finalize() method throws an exception, the garbage collector will terminate the recycling process.

Practical case

Suppose we have a Person class, which has a name field and a finalize () Method:

public class Person {
    private String name;

    @Override
    protected void finalize() {
        System.out.println("释放资源： " + name);
    }
}

In the following code, we create a Person object and then set it to null, making it eligible to be Garbage Collection:

Person person = new Person();
person.name = "John Doe";
person = null;

When the garbage collector runs, it will find that the person object is no longer referenced and mark it as garbage. The garbage collector will then call the finalize() method, which will print the following line:

释放资源： John Doe

Points

• The object finalization mechanism allows Objects clean up resources before being garbage collected.
• finalize() method is called only after the object has been marked as garbage.
• If the finalize() method throws an exception, the garbage collector will terminate the recycling process.
• In general, object finalization should be avoided as it may lead to memory leaks and performance issues.

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