Wrapper Classes

9. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ?
class M9
{
 public static void main(String[] args)
 {
  String s1 = "abc";
  Character c1 = new Character(s1);
  char c2 = c1.charValue();
  System.out.println("done");
 }
}

---

10. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ?
class M10
{
 public static void main(String[] args)
 {
  int i = 10;
  String s1 = "20";
  Integer obj1 = Integer.valueOf(i);
  Integer obj2 = Integer.valueOf(s1);
  int m = obj1.intValue();
  int n = obj2.intValue();
  System.out.println("done");
 }
}

---

11. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ?
class M11
{
 public static void main(String[] args)
 {
  double d1 = 45.987;
  String s1 = "67.9898";
  Double d2 = Double.valueOf(d1);
  Double d3 = Double.valueOf(s1);
  double d4 = d2.doubleValue();
  double d5 = d3.doubleValue();
  System.out.println("done");
 }
}

---

12. Program

//Find what it gives Compiletion Error / Compiletion Successfully / Output ?
class M12
{
 public static void main(String[] args)
 {
  boolean b1 = false;
  String s1 = "true";
  String s2 = "abc";
  Boolean b2 = new Boolean(b1);
  Boolean b3 = new Boolean(s1);
  Boolean b4 = new Boolean(s2);
  
  boolean b5 = b2.booleanValue();
  boolean b6 = b3.booleanValue();
  boolean b7 = b4.booleanValue();
  
  System.out.println(b5);
  System.out.println(b6);
  System.out.println(b7);
 }
}

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