Object Class

21. Program

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

class Y
{
 int j;
}

class Manager24
{
 public static void main (String[] args) 
 {
  X x1 = new X();
  x1.i = 10;
  
  Y y1 = new Y();
  y1.j = 10;
  
  //System.out.println(x1 == y1);
  //different class so can't use equal operator
  
  System.out.println(x1.equals(y1));
  System.out.println(y1.equals(x1));
 }
}

---

22. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ?
class A
{
 
}

class B extends A
{
 
}

class C
{
 
}

class Manager25
{
 public static void main(String[] args)
 {
  A a1 = new A();
  A a2 = new A();
  B b1 = new B();
  C c1 = new C();
  
  System.out.println(a1==a2);
  System.out.println(a1==b1);
  System.out.println(a2==b1);
 // System.out.println(a1==c1);  not same inheritance
 // System.out.println(c1==b1);
  
  System.out.println(a1.equals(a2));
  System.out.println(b1.equals(c1));
  System.out.println(c1.equals(a1));
 }
}

---

23. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ?
//toString Method got override in String class
class Manager1   
{
 public static void main (String[] args) 
 {
  Integer i1 = new Integer(120);
  Integer i2 = new Integer(120);
  System.out.println(i1);
  System.out.println(i2);
  System.out.println(i1.equals(i2));
  // Here it is checking Contain 
 }
}

---

24. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ?

class Manager11   
{
 public static void main (String[] args) 
 {
  Integer i1 = new Integer(0);
  Integer i2 = new Integer(130);
  System.out.println(i1);
  System.out.println(i2);
  System.out.println(i1.equals(i2));
 
 }
}

---

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