Interview Questions And Answers 
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- garbage collection can’t call forcibly. why?
- how class file loaded in jvm.
- what is the disadvantages of garbage collection.
- what is system.gc() and run.gc() mathod.
- why finalize() mathod have protected keyword. whenever it is called automatically in a class which have main method.
Read Answer(1) | 10,005 Views |
(68 votes, avg: 3.15)
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why main method have all needed keyword like public void main?
if i write private in contrast of public then what happen and why?
Read Answers(3) | 6,315 Views |
(13 votes, avg: 3.62)
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1-Write a function named isSquare that returns 1 if its integer argumentis a square of some integer, otherwise it returns 0. Yourfunction must not use any function or method (e.g. sqrt)that comes with a runtime library or class library!
The signature of the function is
int isSquare(int n)Examples:
if n is return reason 4 1 because 4 = 2*2 25 1 because 25 = 5*5/td> -4 0 because there is no integer that when squared equals -4. (note, -2 squared is 4) 8 0 because the square root of 8 is not an integer. 0 1 because 0 = 0*0 Post An Answer | 3,474 Views |
(28 votes, avg: 3.5)
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An array is said to be hollow if it contains 3 or more zeros in themiddle that are preceded and followed by the same number of non-zero elements.Furthermore, all the zeroes in the array must be in the middle of the array.Write a function named isHollow that accepts an integer array andreturns 1 if it is a hollow array, otherwise it returns 0.
If you are programming in Java or C#, thefunction signature is
int isHollow(int[ ] a)If you are programming in C or C++, thefunction signature is
int isHollow(int a[ ], int len) where len is the number of elements in thearrayExamples:
if the input array is is hollow? reason {1,2,0,0,0,3,4} yes 2 non-zeros precede and follow 3 zeros in the middle {1,1,1,1,0,0,0,0,0,2,1,2,18} yes 4 non-zeros precede and follow the 5 zeros in the middle {1, 2, 0, 0, 3, 4} no There are only 2 zeroes in the middle; at least 3 are required {1,2,0,0,0,3,4,5} no The number of preceding non-zeros(2) is not equal to the number of following non-zeros(3) {3,8,3,0,0,0,3,3} no The number of preceding non-zeros(3) is not equal to the number of following non-zeros(2) {1,2,0,0,0,3,4,0} no Not all zeros are in the middle {0,1,2,0,0,0,3,4} no Not all zeros are in the middle {0,0,0} yes The number of preceding non-zeros is 0 which equals the number of following non-zeros. And there are three zeros “in the middle”. Hint: Write three loops. The first counts thenumber of preceding non-zeros. The second counts the number of zeros in themiddle. The third counts the number of following non-zeros. Then analyze theresults.
Post An Answer | 2,861 Views |
(17 votes, avg: 3.53)
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What is the difference between java command line arguments and C command line arguments?
Read Answer(1) | 5,363 Views |
(19 votes, avg: 3.37)
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When i am working with Rmi “Hello world” program without Stub and skeleton the program has been working .
This is remote interface
import java.rmi.*;
public interface SmallInter extends Remote {
public String getMesg(String s) throws RemoteException;
}This is my server side program
import java.rmi.*;
import java.rmi.server.*;public class SmallServer extends UnicastRemoteObject implements SmallInter
//to convert local object into remote object
{
public SmallServer() throws RemoteException {
}public String getMesg(String s) throws RemoteException {
String s1 = “This is a message from server after a message” + s;
return s1;
}public static void main(String arg[]) {
try {
SmallServer ser = new SmallServer();
Naming.rebind(”small”, ser);
System.out.println(”server ready”);
} catch (Exception e) {
e.printStackTrace();
}
}
}This is my Client side code:
import java.rmi.*;
public class SmallClient {
public static void main(String arg[]) {
try {SmallInter remobj=(SmallInter)Naming.lookup(”rmi://”+arg[0] +”/small”);
System.out.println(remobj.getClass());
String res = remobj.getMesg(”from client”);
System.out.println(res);
}
catch (Exception e) {
e.printStackTrace();
}
}
}but when printing the remobj.getClass() it will retuen some “class $proxy”
How this is possible?
please give me the answer………..Post An Answer | 2,032 Views |
(8 votes, avg: 4.25)
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How do you pass data (including JavaBeans) to a JSP from a servlet?
Read Answer(1) | 6,290 Views |
(17 votes, avg: 3.41)
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What is the difference between doPost and doGet methods?
Read Answer(1) | 5,673 Views |
(12 votes, avg: 3.58)
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How can you minimize the need for garbage collection and make memory use more effective?
Read Answers(2) | 6,824 Views |
(15 votes, avg: 3.33)
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What is the primary difference between a Vector and an ArrayList?
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(11 votes, avg: 2.73)
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