Four kinds of Java references, usage scenarios
Strong reference: the garbage collector will not recycle
Soft reference: If there is enough memory space, the garbage collector will not recycle it. If there is insufficient memory space, the garbage collector will recycle it.
Weak reference: Once found, only Weakly referenced objects will be recycled by the garbage collector.
Virtual reference: If it is found that the object also has a virtual reference, the virtual reference will be added to the reference queue associated with it before recycling the object.
What are the characteristics of Java 1. As a representative of static object-oriented programming languages, Java language implements object-oriented theory and allows programmers to perform complex programming with an elegant way of thinking. 2.Java has the characteristics of simplicity, object-oriented, distributed, security, platform independence and portability, and dynamic nature. 3. Use Java to write desktop applications, Web applications, distributed systems and embedded system applications, etc.
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