Java Programming

You can have two String variables (note that String variables are object references) refer to the same String object like so:

String str1 = "Hello";

String str2 = str1;

Now the str1 and str2 are references for the same String object containing the word "Hello".

If you actually want a new String object with a copy of the contents of the original String, you use the String constructor that takes a String argument, like so:

String str3 = new String(str1);

Now str1 and str3 refer to SEPARATE String objects that happen to contain the same sequence of characters (the word "Hello").

Since Strings objects in Java are immutable, they can be shared without worrying about the contents used by one variable being upset by the use through another variable as might happen with char[] arrays in C or C++ so the first method is probably sufficient for most cases.

NumberFormatException is a subclass of the RuntimeException class. An object of type NumberFormatException is thrown when an application attempts to convert a string (that does not represent a number) into a numeric type.

schedule is the thickness of the pipe and class is pressure/temperature rating of a fitting or pipe

zero-terminated string

A null pointer exception in java comes when you are trying to perform any action on an object that isnt initialized/has a value i.e., is a NULL Value

Ex:

private String s; //declare a string

if(s.equals("test")){

//do something..

}

You will get a null pointer in the if condition because you are checking a value that is null which is not allowed..

parseInt() is a method in the Integer class in Java that is used for parsing string values as numbers.

int i = Integer.parseInt("10");

would result in i being assigned a value of 10

#include<stdio.h> int main() { int n,n2; printf("enter the no. < 15 "); // here i am considering the case of 4 bits. (1111) binary = (15) decimal scanf("%d",&n); n2=n^10; /* 10 = 1010 in binary form, to invert its even bits , we will use bit wise XOR (^) operator 1010 has 1 at its even places, so it will invert the even bits of n. if there is any further problem mail me at buntyhariom@gmail.com www.campusmaniac.com */ printf("\n%d",n2); return 0; }

In computer programming, these two terms are interchangeable.

import java.util.List;

import java.util.ArrayList;

import java.util.Collections;

class Vertex implements Comparable<Vertex>

{

public final String name;

public Edge[] adjacencies;

public double minDistance = Double.POSITIVE_INFINITY;

public Vertex previous;

public Vertex(String argName) { name = argName; }

public String toString() { return name; }

public int compareTo(Vertex other)

{

return Double.compare(minDistance, other.minDistance);

}

}

class Edge

{

public final Vertex target;

public final double weight;

public Edge(Vertex argTarget, double argWeight)

{ target = argTarget; weight = argWeight; }

}

public class Dijkstra

{

public static void computePaths(Vertex source)

{

source.minDistance = 0.;

PriorityQueue<Vertex> vertexQueue = new PriorityQueue<Vertex>();

vertexQueue.add(source);

while (!vertexQueue.isEmpty()) {

Vertex u = vertexQueue.poll();

// Visit each edge exiting u

for (Edge e : u.adjacencies)

{

Vertex v = e.target;

double weight = e.weight;

double distanceThroughU = u.minDistance + weight;

if (distanceThroughU < v.minDistance) {

vertexQueue.remove(v);

v.minDistance = distanceThroughU ;

v.previous = u;

vertexQueue.add(v);

}

}

}

}

public static List<Vertex> getShortestPathTo(Vertex target)

{

List<Vertex> path = new ArrayList<Vertex>();

for (Vertex vertex = target; vertex != null; vertex = vertex.previous)

path.add(vertex);

Collections.reverse(path);

return path;

}

public static void main(String[] args)

{

Vertex v0 = new Vertex("Harrisburg");

Vertex v1 = new Vertex("Baltimore");

Vertex v2 = new Vertex("Washington");

Vertex v3 = new Vertex("Philadelphia");

Vertex v4 = new Vertex("Binghamton");

Vertex v5 = new Vertex("Allentown");

Vertex v6 = new Vertex("New York");

v0.adjacencies = new Edge[]{ new Edge(v1, 79.83),

new Edge(v5, 81.15) };

v1.adjacencies = new Edge[]{ new Edge(v0, 79.75),

new Edge(v2, 39.42),

new Edge(v3, 103.00) };

v2.adjacencies = new Edge[]{ new Edge(v1, 38.65) };

v3.adjacencies = new Edge[]{ new Edge(v1, 102.53),

new Edge(v5, 61.44),

new Edge(v6, 96.79) };

v4.adjacencies = new Edge[]{ new Edge(v5, 133.04) };

v5.adjacencies = new Edge[]{ new Edge(v0, 81.77),

new Edge(v3, 62.05),

new Edge(v4, 134.47),

new Edge(v6, 91.63) };

v6.adjacencies = new Edge[]{ new Edge(v3, 97.24),

new Edge(v5, 87.94) };

Vertex[] vertices = { v0, v1, v2, v3, v4, v5, v6 };

computePaths(v0);

for (Vertex v : vertices)

{

System.out.println("Distance to " + v + ": " + v.minDistance);

List<Vertex> path = getShortestPathTo(v);

System.out.println("Path: " + path);

}

}

}

The function of a keyword suggestion tool is to assist in finding relevant and popular keywords for online content. It analyzes search data and provides suggestions for keywords that users are likely to search for. This helps optimize content for search engines and improves visibility and organic traffic to websites.

1. /*Program to Copy one string to another using pointer.*/
2. #include
3. #include
4. main()
5. {
6. char a[80],b[80],*pa,*pb;
7. int i=0;
8. clrscr();
9. printf("Given first string ");
10. scanf("%s",a);
11. pa=&a[0];
12. pb=&b[0];
13. while(*pa!='\0')
14. {
15. *pb=*pa;
16. pa++;
17. pb++;
18. }
19. *pb='\0';
20. printf("\nCopied string is");
21. puts(b);
22. }

The percent sign in Java is the modulus operator. Modulus is used to find the remainder from a division

For example if you did

int x = 10 % 6;

x would be equal to 4. 10 divided by 6 has a remainder of 4. The modulus operator can be used to determine whether a number is divisible by another among other things.

Java's main function denotes the entry point into the execution of your program.

If your talking about when you are packing components in a JFrame for example, something along the syntax of:

public static void main(String[] args) {

GUIFrame frame = new GUIFrame();

frame.setLocation(100, 100);

frame.setTitle("This is a JFrame implementation");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.pack();

frame.setVisible(true);

}

If you mean something like this, then the pack() method simply crams all the components together, to make the smallest space in a frame. They can be useful if all you want is that, otherwise options such as the .setSize(int height, int length); are also available for specific sizes.

I am not sure whether you actually need it, perhaps you do. The point is, if any Web site has Java applets - components programmed for Java - then the user must install Java to make it work. Java (and alternative technologies, such as Flash, or SilverLight) make it possible to make "richer" Web pages, i.e., Web pages with more options, and a better visual presentation.

I am not sure whether you actually need it, perhaps you do. The point is, if any Web site has Java applets - components programmed for Java - then the user must install Java to make it work. Java (and alternative technologies, such as Flash, or SilverLight) make it possible to make "richer" Web pages, i.e., Web pages with more options, and a better visual presentation.

I am not sure whether you actually need it, perhaps you do. The point is, if any Web site has Java applets - components programmed for Java - then the user must install Java to make it work. Java (and alternative technologies, such as Flash, or SilverLight) make it possible to make "richer" Web pages, i.e., Web pages with more options, and a better visual presentation.

I am not sure whether you actually need it, perhaps you do. The point is, if any Web site has Java applets - components programmed for Java - then the user must install Java to make it work. Java (and alternative technologies, such as Flash, or SilverLight) make it possible to make "richer" Web pages, i.e., Web pages with more options, and a better visual presentation.

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There are 2 main types of Hierarchical Inheritance - Single and Multi Level

Class A extends Class B - Single

Class A extends Class B which in turn extends Class C - Multi level.

Actually there is no limit to the number of levels till which you can inherit classes in multi level inheritance. But it is preferable to keep it at around 3 or 4 for ease of maintenance and understanding.

No. Logic should never go in a constructor; constructors should only be used to instantiate and initialize object data.

Yes.

To compare the contents of two objects. The equality, "=", will simply tell you whether two objects are in the same memory location; it doesn't tell you whether their contents are actually the same. To compare the contents, there is an equals() method which tells you whether the contents are actually equal; there is also a compareTo() which can also tell you which of two objects is "greater". Since objects can be quite complex, the programmer may have to overwrite the (often useless) default behavior of these methods.

It is a part of swing package.

Standard Number is a basic/regular number (Examples: 2, 4.2, 7000)