What are the four types of references in Java?

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

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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