Wrapper Classes

17. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ?
class M17
{
 public static void main(String[] args)
 {
  String s1 = "9.8";
  float f1 = Float.parseFloat(s1);
  double d1 = Double.parseDouble(s1);
  System.out.println("------");
  System.out.println(f1);
  System.out.println(d1);
  System.out.println("------");
  int i = Integer.parseInt(s1);
  System.out.println("done");
 }
}

---

18. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ?
class M18
{
 public static void main(String[] args)
 {
  String s1 = "abc";
  String s2 = "true";
  boolean b1 = Boolean.parseBoolean(s1);
  boolean b2 = Boolean.parseBoolean(s2);
  System.out.println(b1);
  System.out.println(b2);
 }
}

---

19. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ?
class M19
{
 public static void main(String[] args)
 {
  String s1 = "p";
  //char c1 = Character.parseChar(s1);
   System.out.println("done");
 }
}

---

20. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ?
class M20
{
 public static void main(String[] args)
 {
  int i = 10;
  double j = i;
  System.out.println("done");
 }
}

---

21. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ?
//file must save as M21
class A
{
 
}

class B extends A
{
 
}

public class M21
{
 public static void main(String[] args)
 {
  A a1 = new B();
  Object o1 = new A();
  Object o2 = new B();
  System.out.println("done");
 }
}

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