Object Class

25. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ?
class C
{
 int i;
}  

class Manager3
{
 public static void main (String[] args) 
 {
  C c1 = new C();
  C c2 = c1;
  
  System.out.println(c1);
  System.out.println(c2);
  System.out.println(c1.equals(c2));
  System.out.println(c1.hashCode());
  System.out.println(c2.hashCode());

 }
}

---

26. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ?
class D
{
 int i;

 // overrided hashCode method from object class
 public int hashCode()
 {
  return i;
 }
}  

class Manager4
{
 public static void main (String[] args) 
 {
  D d1 = new D();
  d1.i = 100;
  
  D d2 = new D();
  d2.i = 200;
  
  System.out.println(d1.hashCode());
  System.out.println(d2.hashCode());

 }
}

---

27. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ?
class E
{
 int i = 10, j = 20;

 // overrided hashCode method from object class
 public int hashCode()
 {
  return i + j;
 }
 
 E()
 {
  
 }
 
 E(int i)
 {
  this.i = i;
 }
 
}  

class Manager5
{
 public static void main (String[] args) 
 {
  E e1 = new E();
  E e2 = new E(100);
  
  System.out.println(e1.hashCode());
  System.out.println(e2.hashCode());

 }
}

---

28. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ?
class F
{
 F obj;
}

class Manager6
{
 public static void main(String[] args)
 {
  F f2 = new F(); 
  F f3 = new F(); 
  F f4 = new F(); 
  
  f2.obj = f3;
  f3.obj = f4;
  f4.obj = f2;
  
  f2 = f3 = f4 = null; 

  System.out.println("done");
 } 
}

---

29. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ?
// finalize method used here
class G
{
 protected void finalize() throws Throwable
 {
  System.out.println("Finalize");
 }
}

class Manager7
{
 public static void main(String[] args)
 {
  G g1 = new G();
  g1 = null;
  System.gc();
  System.out.println("done");
 } 
}

---

30. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ?
//cloneUsage method used here
class H implements Cloneable
{
 int i;
 void cloneUsage()
 {
  try
  {
   H h1 = (H) clone();
   System.out.println(h1.i);
  }
  
  catch(CloneNotSupportedException ex)
  {
   ex.printStackTrace();
  }
 }
}

class Manager8
{
 public static void main(String[] args)
 {
  H obj = new H();
  obj.i = 300;
  obj.cloneUsage();
 } 
}

---

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