[Solved] Consider the following Java code snippet:public class TestGC { public static void main(String[] args) { String s = new String("hello");... } }What is the expected output when this code runs? | Java

Java - Memory Management Basics

Consider the following Java code snippet:

public class TestGC {
  public static void main(String[] args) {
    String s = new String("hello");
    s = null;
    System.gc();
    System.out.println("Done");
  }
}

What is the expected output when this code runs?

ADone

Bhello

CNo output, program crashes

DDone followed by garbage collection logs

Step-by-Step Solution

Solution:

Step 1: Trace code execution and determine output
The string object "hello" is created, then the reference s is set to null, making it eligible for GC. System.gc() suggests collection but does not guarantee immediate action or logs. The only guaranteed output is "Done" from the print statement.
Final Answer:
Done -> Option A
Quick Check:
Print statement output = Done [OK]

Quick Trick: System.gc() does not print anything; only explicit prints show [OK]

Common Mistakes:

Expecting garbage collection logs to print automatically
Thinking the string "hello" prints after null assignment
Assuming program crashes due to null reference

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Final Answer:

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