Answer Posted / vikneswarank

its a class used to convert primitive data type to user
defined data type like Integer

for example

public class WrapperSample1
{
public static void main (String args[])
{
int iVal = 100;
long lVal = 200;
float fVal = 300;
double dVal = 400;

String str = "123";

//primitive types to corresponding wrapper objects
Integer intVal = Integer.valueOf(iVal);
Long lgVal = Long.valueOf(lVal);
Double dbVal = Double.valueOf(dVal);
Float ftVal = Float.valueOf(fVal);

//primitive types to string objects
str = String.valueOf(iVal);
str = String.valueOf(lVal);
str = String.valueOf(fVal);
str = String.valueOf(dVal);

//wrapper Objects to corresponding primitive types
iVal = intVal.intValue();
lVal = lgVal.longValue();
fVal = ftVal.floatValue();
dVal = dbVal.doubleValue();

//String to primitive types
iVal = Integer.parseInt(str);
lVal = Long.parseLong(str);
fVal = Float.parseFloat(str);
dVal = Double.parseDouble(str);

//string to wrapper objects
intVal = Integer.valueOf(str);
lgVal = Long.valueOf(str);
ftVal = Float.valueOf(str);
dbVal = Double.valueOf(str);
}
}

What is a boolean structure?

783

---

Tell me are there implementations for sorting and searching in the java libarary?

816

---

What is the difference between a static and a non-static inner class in java programming?

727

---

FOR EXAMPLE WE R HAVING TWO LIST ELEMENTS ..BOTH LISTS CONTAINS ID,NAME,PLACE ..I NEED TO COMPARE BOTH IDS IN TWO LISTS,IF ID'S R SAME MEANS WE HAVE ADD THE DETAILS(LIKE NAME,PLACE) TO MAP...HOW IS POSSIBLE ?CAN ANY ONE SUGGEST?

2972

---

Difference between vector and arraylist.

781

---

What is static keyword in java?

757

---

what is heap memory?

854

---

What are the major drawbacks of external iteration?

805

---

Explain different types of thread priorities ?

850

---

Differentiate between overriding and overloading cases?

796

---

What is the use of list in java?

739

---

Explain the importance of finalize() method.

750

---

how to know the total memory occupied by the objects in the ArrayList(Array list may contain duplicate objects)

2114

---

What is instance synchronization?

811

---

Is final static java?

770

---