Labs

These labs require drawing references to objects on the heap.

1. After which line is the object created at line 4 eligible for garbage collection?

   1: public class GCObj {
   2:   public static void main(String[] args) {
   3:     GCObj one = new GCObj();
   4:     GCObj two = new GCObj();
   5:     GCObj three = one;
   6:     one = null;
   7:     GCObj four = one;
   8:     three = null;
   9:     two = null;
   10:    two = new GCObj();
   11:  }
   12:}
   

   Lab 1 Solution

2. After which line is the object at line 6 eligible for garbage collection.

   1: public class RefObj {
   2:
   3:   private RefObj ref;
   4:   
   5:   public static void main(String[] args) {
   6:      RefObj a = new RefObj();
   7:      RefObj b = new RefObj();
   8:      b.ref = a;
   9:      a = null;
   10:     RefObj c = a;
   11:     b = null;
   12:   }
   13: }
   

   Lab 2 Solution

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