Basic Java Knowledge

Two:
String AA = "abc"; String aa = new String ("abc"); What's the difference? Where do you put the literal, method area? The latest version has changed and seems to have been put in the heap.

III: Must the object of new be placed on the heap? Is there a way to put it on the stack?

Four: JVM garbage collection? Several strategies? cocurrent GC?

Five: memory Leak (out of memory) VS RAM overflow (stack overflow)? What can cause a memory leak? Adjust virtual parameters? Analyze the dump file.

VI: How is the IOC implemented? Factory mode.

Seven: How does Spring initialize the bean based on XML? Store beans in what form. Initialize generate map, what is the key to map? What is value?

Basic Java Knowledge