java - How to explicitly perform garbage collection -

with built-in garbage collection, java allows developers create new objects without worrying explicitly memory allocation , deallocation, because garbage collector automatically reclaims memory reuse.

afaik garbage collector runs when app runs out of memory. holds graph represents links between objects , isolated objects can freed.

though have system.gc(), if write system.gc() in code java vm may or may not decide @ runtime garbage collection @ pointas explained post system.gc() in java

so having doubts regarding garbage collection process of java.

• i wonder if there such method in java free() such in c language, invoke when explicitly want free part of memory allocated new operator.

• also new performs same operation malloc() or calloc()?

• are there alternates delete(), free(), malloc(), calloc() , sizeof() methods in java.

afaik garbage collector runs when app runs out of memory.

little disagree on that. no. runs asynchronously , collects referenced memory locations.

i wonder if there such method in java free() such in c language, invoke when explicitly want free part of memory allocated new operator.

again system.gc() call then, not 100% sure of memory clear immediately.

also new performs same operation malloc() or calloc()?

if mean allocation memory, yes object

are there alternates delete(), free(), malloc(), calloc() , sizeof() methods in java.

afaik there no direct functions so.

on top of head, need not worry such things , modern jvm's smart enoguh handle these things.

an interesting thread here found on so, when gc decides run. hope helps.