目的相同
方法有差

In languages like C and C++, the programmer is responsible for both the creation and destruction of objects. Sometimes, the programmer may forget to destroy useless objects, and the memory allocated to them is not released. The used memory of the system keeps on growing and eventually there is no memory left in the system to allocate. Such applications suffer from "memory leaks".

Java Garbage Collection is the process by which Java programs perform automatic memory management. Java programs compile into bytecode that can be run on a Java Virtual Machine (JVM). 

完整的說明在這裡

C/C++需要手動分配和釋放動態記憶體，而Java的垃圾回收機制會自動管理對象的生命週期，避免了手動管理內存的錯誤和風險。
雖然自動化的方式可以減少記憶體泄漏和非法訪問等錯誤，但也帶來較高的運行成本和記憶體開銷。