Object And Class

15. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ? 
class O
{ 
 int i;
 
 static public void main(String[] args)
 {
  O o1 = new O();
  O o2 = o1;
  o1.i = 10;
  System.out.println(o2.i);
  o2.i = 20;
  System.out.println(o1.i);
 }
 
}

---

16. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ? 
class P
{ 
 int i;
 
 static void test(P p1)
 {
  System.out.println("test :" + p1.i);
 }
 static public void main(String[] args)
 {
  P p1 = new P();
  System.out.println("Main :" + p1.i);
  p1.i = 10;
  test(p1);
  
 }
 
}

---

17. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ? 
class Q
{ 
 int i;
 
 static public void main(String[] args)
 {
  Q q1 = new Q();
  q1.i = 10;
  Q q2 = q1;
  System.out.println("Main :" + q2.i);
  q2.i = 20;
  Q q3 = q2;
  System.out.println("Main :" + q3.i);
  System.out.println("Main :" + q1.i);
  
  
 }
 
}

---

18. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ? 
class R
{ 
 int i;
 
 static void test(R r2)
 { 
  System.out.println( r2.i);
  r2.i = 20 ;    // now r1 = r2 = 20
 }
 static public void main(String[] args)
 {
  R r1 = new R();
  r1.i = 10;
  System.out.println( r1.i);
  test(r1);        
  System.out.println(r1.i);
 }
 
}

---

19. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ? 
class S
{ 
 int i;
 
 static void test1(int x)
 { 
  System.out.println(x);
  x = 10 ;
  System.out.println(x);
  
 }
 
 static void test2(S s1)
 { 
  System.out.println(s1.i);
  s1.i = 20;
  
 }

 static public void main(String[] args)
 {
  S s2 = new S();
  s2.i = 30;
  System.out.println(s2.i);
  test1(s2.i);
  System.out.println(s2.i);
  test2(s2);
  System.out.println(s2.i);
  
 }
 
}

---

20. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ? 
class T
{
 int i ;
 static T test()
 {
  T t1 = new T();
  t1.i = 10;
  return t1;
 }
 
 public static void main(String[] args)
 {
  T t2 = test(); 
  System.out.println(t2.i);
  
 }
}

---

21. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ? 
class U
{
 int i ;
 static U test()
 {
  U u1 = new U();
  return u1;
 }
 
 public static void main(String[] args)
 {
  U u2 = test(); 
  System.out.println(u2.i);
 }
}

---

Page....