Comparison of assignment efficiency of Java array

1.for cycle-by-copy

2.system.arraycopy

3.array.copyof

4. Using the Clone method
Efficiency comparison of the above four methods:

　　system.arraycopy    > Clone > System.copyof > for loop

Note: Arraycopy as the Natvie (local) method, is the fastest, the following method of the source code description.

Arrays.copyof (Arrays Class) implementation, in the source code is called system.copyof, a step more.
The source code for clone is defined as follows;

Protected native Object clone () throws Clonenotsupportedexception;

Many of the posts on the clone web show the results of the experiment.
The post may be more detailed:
http://xuyuanshuaaa.iteye.com/blog/1046621
http://blog.csdn.net/stand1210/article/details/52686740 (Efficiency Experiment)
http://blog.csdn.net/tingzhiyi/article/details/52344845

Comparison of assignment efficiency of Java array