OpenJDK 10 Practice Project

UNIT 1 Test Local-Variable Type Inference (var)

We can see the test result.
Old mean use old java variable defined. New mean all use var.
Avg Cost Time (ms) : When you use more var. According to different object forms. It may the average execution time per second increase. However, some are reduced.
Avg Use Memory (MB) : Basically the test results will not differ too much. Unless you have a large number of executions, you can reduce the use var.

type	avgCostTime(ms)	avgUseMemory(MB)	runtime	looptime
OldArrayList	3	3	100000	100
NewArrayList	1	2	100000	100
OldLinkedList	14	4	100000	100
NewLinkedList	12	4	100000	100
OldHashMap	14	10	100000	100
NewHashMap	20	10	100000	100
OldLinkedHashMap	13	10	100000	100
NewLinkedHashMap	26	10	100000	100
OldHashSet	9	8	100000	100
NewHashSet	18	8	100000	100
OldLinkedHashSet	17	9	100000	100
NewLinkedHashSet	24	9	100000	100
OldIntAdd	0	0	100000	100
NewIntAdd	0	0	100000	100
OldBigDecimalAdd	0	3	100000	100
NewBigDecimalAdd	0	3	100000	100
OldString	96	28	10000	100
NewString	91	29	10000	100
OldStringBuilder	2	2	100000	100
NewStringBuilder	1	2	100000	100
OldThread	700	6	10000	100
NewThread	695	6	10000	100
OldHttps	1173	5	10	100
NewHttps	1001	5	10	100