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Oracle Certified Professional: Java SE Developer 1Z0-831 (Java SE 25) · Domain 3: Using object-oriented concepts in Java

Object lifecycle and garbage collection eligibility

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Last reviewed September 25, 2026 · Leer en español

Objects in Java are created on the heap, usually with new, and they live as long as they are needed. You never free memory yourself. Instead, the garbage collector (GC), part of the Java Virtual Machine (JVM), finds objects that the program can no longer reach and reclaims their memory. Variables, by contrast, hold either primitive values or references to objects; local variables live on the stack while their method runs.

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