Collection of programming questions in java....?

Discussion in 'Computer Science | IT | Networking' started by mohit007kumar00, Nov 16, 2010.

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    mohit007kumar00 Certified CEan

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    hello friend's,
    I think during exam time we all need the collection of the questions that cover all the topics of the programming language.
    Not only during exam time it will also helps you to revise the entire subject.
    I know most of our CEan's have some collection of programs which cover all the syllabus.
    .
    I requested all the CEan's to post your collection of programming questions in java which cover some sections.

    :cean::cean::cean:
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    mohit007kumar00, Nov 16, 2010
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    goyal420 Addict

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    Do you mean theoretical questions or programming based questions?
    goyal420, Nov 16, 2010
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    mohit007kumar00 Certified CEan

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    Not theoretical....post only your programming question collections....So that all our CEan's can give a try to it.
    You have to post the questions that cover the whole concepts of a particular topic.
    mohit007kumar00, Nov 16, 2010
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    AbraKaDabra Moderator

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    Read the following program:

    public class test {
    public static void main(String [] args) {
    int x = 3;
    int y = 1;
    if (x = y)
    System.out.println("Not equal");
    else
    System.out.println("Equal");
    }
    }

    What is the result?
    AbraKaDabra, Nov 16, 2010
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    AbraKaDabra Moderator

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    Write java application program for generating 4 threads to do the following operations.
    (i) getting n numbers
    (ii) printing even numbers
    (iii) printing odd numbers
    (iv) printing average of a numbers.
    AbraKaDabra, Nov 16, 2010
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    AbraKaDabra Moderator

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    Q. Write a java application to get n numbers and print them in the order using Heap sort procedure.

    Q. Write a program to implement shallow copy and deep copy.

    Q. Assume you have an array list with 7 objects in it. And there is an int[] as:

    int[] intArray = new int[3];
    intArray[0] = 2;
    intArray[1] = 4;
    intArray[2] = 6;
    How do you go about deleting the objects from ArrayList based on the values in int[]?
    AbraKaDabra, Nov 16, 2010
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    AbraKaDabra Moderator

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    Q. Can main() of one program in Java be invoked in another Java Program's main()? Explain with example.

    Q. Write a program in Java to give the output as follows:

    1
    1 2
    1 2 3
    1 2 3 4

    and

    1
    2 3
    4 5 6
    7 8 9 10
    AbraKaDabra, Nov 16, 2010
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    goyal420 Addict

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    can you please explain about this program?
    goyal420, Nov 16, 2010
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    mohit007kumar00 Certified CEan

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    Display programs...

    1 1 1 1 1
    1 1 1 1 1
    1 1 1 1 1
    1 1 1 1 1
    1 1 1 1 1
    ....
    1 1 1 1 1
    2 2 2 2 2
    3 3 3 3 3
    4 4 4 4 4
    5 5 5 5 5
    ......
    1 2 3 4 5
    1 2 3 4 5
    1 2 3 4 5
    1 2 3 4 5
    1 2 3 4 5
    ......
    1
    1 1
    1 1 1
    1 1 1 1
    1 1 1 1 1
    ......
    1
    1 2
    1 2 3
    1 2 3 4
    1 2 3 4 5
    .......
    1
    2 2
    3 3 3
    4 4 4 4
    5 5 5 5 5
    .......
    5 4 3 2 1
    5 4 3 2 1
    5 4 3 2 1
    5 4 3 2 1
    5 4 3 2 1
    .........
    1
    1 2
    1 2 3
    1 2 3 4
    1 2 3 4 5
    .........
    ............1
    .........1 2 1
    ......1 2 3 2 1
    ...1 2 3 4 3 2 1
    1 2 3 4 5 4 3 2 1
    ...........

    ............1
    .........1 2 1
    ......1 2 3 2 1
    ...1 2 3 4 3 2 1
    1 2 3 4 5 4 3 2 1
    ...1 2 3 4 3 2 1
    ......1 2 3 2 1
    .........1 2 1
    ............1
    .
    mohit007kumar00, Nov 16, 2010
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    goyal420 Addict

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    Code:
    class test {
public static void main(String [] args) {
int n=1;
for(int i=1;i<5;i++)
{
for(int j=1;j<=i;j++)
{
System.out.print((n++)+(" "));
}
System.out.println();
}
}
}
    Code:
    class test {
public static void main(String [] args) {
for(int i=1;i<5;i++)
{
for(int j=1;j<=i;j++)
{
System.out.print(j+" ");
}
System.out.println();
}
}
}
    PS:-I love these kinds of program since the day i fell in love with programming :)
    goyal420, Nov 16, 2010
    #10

    goyal420 Addict

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    Do you want to display this output through a single program?
    goyal420, Nov 16, 2010
    #11

    mohit007kumar00 Certified CEan

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    No It's the collection of programs.
    .
    But ya it's also a good idea to display all through a single program....give a try to it.
    mohit007kumar00, Nov 16, 2010
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    AbraKaDabra Moderator

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    Re: Collection of programming questions in java?

    Java provides a mechanism for creating copies of objects called cloning.
    There are basically two ways to make a copy of an object called shallow copy and deep copy.

    Shallow copy is a bit-wise copy of an object. A new object is created that has an exact copy of the values in the original object.
    If any of the fields of the object are references to other objects, just the references are copied. Thus, if the object you are copying contains references to yet other objects, a shallow copy refers to the same sub objects.

    Deep copy     is a complete duplicate copy of an object. If an object has references to other objects, complete new copies of those objects are also made.
    A deep copy generates a copy not only of the primitive values of the original object, but copies of all sub objects as well, all the way to the bottom. If you need a true, complete copy of the original object, then you will need to implement a full deep copy for the object.

    A little search on the internet will show you how to implement them using a Java program. ;)
    AbraKaDabra, Nov 16, 2010
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    goyal420 Addict

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    @akd Thanks for explanation
    @mohit hm i will give it a try
    goyal420, Nov 16, 2010
    #14

    Deepika Bansal Certified CEan

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    The result is the compilation error in the code because if(x=y) is invalid in java. It should be if(x==y).
    Please correct me if i am wrong.
    Deepika Bansal, Nov 17, 2010
    #15

    Deepika Bansal Certified CEan

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    it can be a menu based program. like what option the user chooses, accordingly the program will react.
    Is anyone having any other idea to implement these series in a single program code...??
    Deepika Bansal, Nov 17, 2010
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    goyal420 Addict

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    yeah deepika this can be made

    i am thinking about a code through which you can create any pattern of your choice ,just input no and pattern will be ready
    goyal420, Nov 17, 2010
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    ritz53 Certified CEan

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    how to write programmme in java.. Odd number of position and even number of pos

    write a programme in java ...odd number of position and even no. of position ...
    eg: 5684
    odd add no: 5+8=13
    even add no.:6+4=10
    ritz53, Jan 7, 2011
    #18

    Varsha0802 Certified CEan

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    Can it be done? Please explain. I haven't ever heard of this.
    Varsha0802, Jan 22, 2011
    #19

    Varsha0802 Certified CEan

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    I got the answer. main() of one program in Java can be invoked in another Java Program's main(). It behaves just like any other method.
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    Varsha0802, Jan 28, 2011
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