1. The thread lock copyonwritearraylist is suitable for writing less read and many concurrent scenes, for ArrayList a kind of threaded-safe variant readwritelock is a read-write lock, he requires the write and write mutually exclusive, between the read and write mutually exclusive, between reading and reading can be executed concurrently. In the case of read and write less can improve efficiency 2. Packaging class Packaging Class "= =" Operation does not encounter arithmetic operations will not automatically unpacking the Equals () method of the wrapper class does not handle Data transformation 3. JVM Virtual machine Action virtual machines address and load class files through the ClassLoader to interpret bytecode as instructions and perform garbage collection to provide a platform for interacting with the hardware
Written error correction
