Gabage Collection

• System class contains a static method
• System.gc();

By Runtime class

• Runtime r = Runtime.getRuntime();
• freeMemory() // return freemomory in the heap
• totalMemory() // return total of the heap
• gc() for requesting jvm to run garbage collector
• when object is no use, when we call gc, we automatically call this object finaliza method
• this object finallize

class C {
    C i;
   public static void main(String[] args) {
       C t = new C();
       t = null;
       System.gc();
       System.out.println("end of main");
   }

   public void finalize() {
       System.out.println("finalize method");
       System.out.println(10 / 0);// will ignore when runtime
   }
}

// finalize method
// end of main