Java experience test

Fullname *

When Survivor space on the heap is full.

When Young generation space on the heap is full.

When Eden space on the heap is full.

When the whole heap is full.

When Old generation space on the heap is full.

	true	false
The time which garbage is collected is more predictable in automatic reference counting than in tracing garbage collection.
Tracing garbage collection relies on reference count to know which objects are garbage.
Tracing garbage collection traces reachable objects from GC roots and clean up unreachable objects.
Automatic reference counting can clean up garbages which have circular reference.
Tracing garbage collection can clean up garbages which have circular reference.

	true	false
Interface is a public contract of any classes that implement it
Interface is used to abstracting away the implementation details of classes
Interface can can contain the implementation of methods.
Abstract class can only contain method prototypes and can not contain any field or implementation of method.

	true	false
JVM is an abstract machine to execute java bytecode.
JVM can only execute bytecode which is compiled from java code.
JVM is a virtual machine to compile java code to java bytecode.
There is only one JVM which is provided by Oracle.

String interning is used for optimizing the memory usage of mutable and immutable strings.

String interning is used for optimizing the memory usage and and the comparison of immutable strings.

String interning is used to optimizing the string manipulation of String object.

String interning is used to optimizing the string manipulation of StringBuilder and StringBuffer object.

is used for creating and cleaning up database connection.

is used for reusing database connections.

is used for reducing the overhead of network round-trips when executing queries.

is used for creating and cleaning up threads.

is used for reusing threads.

is used to optimize thread execution.

is used to minimize context switching between threads.