Object Class

17. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ?
class S
{
 double i;
 
 S(double i)
 {
  this.i = i;
 }
}

class Manager19
{
 public static void main (String[] args) 
 {
  S s1 = new S(10.5);
  S s2 = new S(10.5);
  S s3 = s2;
  
  System.out.println(s1 == s2); 
  System.out.println(s2 == s3); 
  System.out.println(s3 == s1); 
  System.out.println(s1.i == s2.i);
  
  System.out.println(s1.equals(s2)); 
  System.out.println(s2.equals(s3)); 
  System.out.println(s3.equals(s1)); 

 }
}

---

18. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ?
class T
{
 int i ;
 
 T(int i)
 {
  this.i = i;
 }
 
 public boolean equals(Object obj )
 {
  T t1 = (T)obj;
  return i == t1.i;
  // this.i compiler do it.  
 }
}

class Manager20
{
 public static void main (String[] args) 
 {
  T t1 = new T(89);
  T t2 = new T(89);
  System.out.println(t1.equals(t2)); 

 }
}

---

19. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ?
class U
{
 double i ;
 
 U(double i)
 {
  this.i = i;
 }
 
 public boolean equals(Object obj )
 {
  boolean b = ((U)obj).i == this.i;
  return b;
 }
}

class Manager21
{
 public static void main (String[] args) 
 {
  U u1 = new U(80.99);
  U u2 = new U(80.99);
  System.out.println(u1.equals(u2)); 

 }
}

---

20. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ?
class V
{
 int i , j;
 
 V(int i, int j)
 {
  this.i = i;
  this.j = j;
 }
 
 public boolean equals(Object obj )
 {
  V v1 = (V) obj;
  boolean b = (i == v1.i && j == v1.j);
    // this.i and this.j
  return b;
 }
}

class Manager22
{
 public static void main (String[] args) 
 {
  V v1 = new V(100, 200);
  V v2 = new V(100, 200);
  System.out.println(v1.equals(v2));
 }
}

---

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