Java program to add two numbers using bufferedreader

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Java program to add two numbers using bufferedreader

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am using BufferedReader class to read inputs in my Java program. I want to read inputs from a user who can enter multiple integer data in single line with space.

I want to read all these data in an integer array. So, is there any solution to my problem or we can't just read multiple integers from one line using BufferedReader objects. You can use StringTokenizer class of java.

java program to add two numbers using bufferedreader

The StringTokenizer class allows an application to break a string into tokens. You can use this tokens using nextToken method of StringTokenizer class. Learn more. How to read multiple integer values from one line in Java using BufferedReader object? Ask Question.

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Alphanumeric is a combination of alphabetic and numeric characters sometimes shortened to alphameric. In computing, the alphanume The diameter of the sun is approximatelymiles.When it comes to reading character input streams, the Java BufferedReader class is extremely important, and I'll demonstrate this in several different source code examples. I'll start with what might be the most common use of the BufferedReader classusing it with a FileReader to read a text file.

This code comes from my earlier " How to open and read a file with Java" tutorial. Again, this is the usual approach I take with Java to read a text file from a filesystem.

I start with a FileReaderso it's important to understand how that class works. As the FileReader javadoc states:. The FileReader FileReader is meant for reading streams of characters.

For reading streams of raw bytes, consider using a FileInputStream. I wrap a BufferedReader around the FileReader for two reasons.

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First, the BufferedReader does what its name implies, buffering the input to make the reading process much faster. Second, the BufferedReader provides a readLine method which converts each line of input into a Java Stringand greatly simplifies the file-reading process, as you saw in that previous example.


Regarding the buffering process, here are a few lines from the BufferedReader javadoc:. The BufferedReader In general, each read request made of a Reader causes a corresponding read request to be made of the underlying character or byte stream. Without buffering, each invocation of read or readLine could cause bytes to be read from the file, converted into characters, and then returned, which can be very inefficient.

Because of that behavior, it's very common to write a while loop that iterates over a BufferedReader as shown in the example above, and again here:. Again, the BufferedReader readLine method either returns a String or a null reference, and it's a great convenience method to use when reading text input like this. The following code comes from my " How to read command-line input with Java " tutorial.

I've simplified that code and added some documentation to it so you can see how to wrap a BufferedReader around an InputStreamReader which in turn is already wrapped around System. I hope the comments in the code cover what I'm doing in this code, but if you'd like more information, please visit my " How to read command line input with Java " tutorial. As you can see, once you wrap a BufferedReader around an InputStreamReader, the rest of our code is very similar.

As mentioned earlier, I usually just try to get to a point where I can use the BufferedReader readLine method. I think of that as a convenience method that makes reading from a file, standard input, or an internet connection URL or socket much easier. If you're interested in more details on this last BufferedReader example, I took that code snippet from my "How to open and read content from a URL with Java" tutorialand there's much more discussion in that tutorial.

As you've seen, the common thread around all of these examples is wrapping a BufferedReader around an InputStream, and then using the BufferedReader readLine method to simplify the process of reading the input as a series of Strings. Although I haven't discussed it in great length, the BufferedReader does what its name implies, buffering the input to make reading much faster. In tests I conducted before the Java 5 days, using a BufferedReader made file reading at least ten times faster than using a non-buffered approach.

For more information on the Java BufferedReader class, please visit the BufferedReader javadoc link shown above, or the links to any of my other BufferedReader-related tutorials shared above.

Java BufferedReader examples.Prerequisite : PrintWriterBufferedReader. Let the given two files be file1. Our Task is to merge both files into third file say file3.

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The following are steps to merge. To successfully run the below program file1. Note : If file3. This article is contributed by Gaurav Miglani. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute. See your article appearing on the GeeksforGeeks main page and help other Geeks.

java program to add two numbers using bufferedreader

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. Writing code in comment? Please use ide. Java program to merge two files into a third file Java program to merge two files alternatively into third file Which Java libraries are useful for competitive programming?

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Load Comments.A String has an associated length. You can convert data that is entered as a primitive type into a String by using the valueOf method.

Java Program to add two numbers using BufferedReader

There are three objects that can be used for input and output. The System. The println method will print a carriage return and line feed after printing so that the next output will be printed on a new line. The method print will keep the cursor on the same line after printing. The primitive data types in Java are: boolean, byte, char, short, int, long, float, and double. For each primitive data type, Java provides a wrapper class that allows the data to be represented as objects.

The wrapper classes provide methods to perform certain data conversions, e. How do we input data from the console? We will discuss the ways to input a String, an integer, and a real number. Unfortunately this class does not have a method for simple input.

java program to add two numbers using bufferedreader

But there is a java. BufferedReader class that has a method readLine. A buffer is a region in memory where input from the terminal is stored until needed by the program. If you want to perform buffered input on the System. Once we have created a BufferedReader we can use its method readLine to read one line of characters at a time from the keyboard and store it as a String object. Once we have the input data in a String object we can use the various methods available to a String object to manipulate the data.

Since data can get corrupted during an input operation the method readLine can alert the user by throwing an exception. There are several ways that Java allows a user to handle exceptions. For the time being we will add the phrase "throws IOException" and let the system to do the error handling.

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Reading an integer: One way to read an integer is to read the input as a String and then use the method parseInt of the wrapper class Integer to convert the String to an integer. Reading a real number: There is a wrapper class java.

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Double that can take the input as a String and a method parseDouble to convert the String to a real number. To read from the console we must use a BufferedReader object. But the BufferedReader class is in the package java. The following program snippet shows how to read and write to the console.This document is intended to provide discussion and examples of the usage of BufferedReader.

We will be going through the basic syntax of BufferedReader class, use of its methods and principles. Make sure to understand and master the use of this class since this is one of the most used class in java. The BufferedReader class main functionality is to reads text from inputstream. Morever it is used to buffer characters for the purpose of efficient handling of characters, arrays and strings. There are 2 constructors available for BufferedReader class but for the purpose of simplicity we will concentrate on the basic constructor which takes a Reader as method argument.

Lets take a look on below example on how to instantiate a BufferedReader. Reader class alone is not sufficient so we have to take one of its subclass the InputStreamReader to read InputStream.

On this BufferedReader example, we have used the System. So what is the purpose of the above example. Basically we just get the user input from the console and then print a welcome message. Lets dig in on each part of the code. First we have initialized our BufferedReader as what we have explained earlier using the constructor that takes Reader as method argument.

After we have initialized our BufferedReader we have printed using System. Please go through on our StringBuffer examples to know more on this. Now that we have already declared all the things we need, we now read the user input using the method of BufferedReader class readline. This method returns a complete line of String representation of what has been inputted by the user on the console. We then append the result of readLine method to our StringBuffer using the append method.

After getting what we need from the user input on the console we have invoked the close method in order to close the stream. You might have noticed that we have also enclosed our code with try-catch block. This is because the readLine and close method throws IOException thus we either have to catch this or to throw it back. In any case that we encounter an IOException this java program will output a sensible message and the full stacktrace of what has happened.

On this example we would be dealing a more complicated example of using BufferedReader.

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On the earlier example we have used InputStreamReader as our constructor argument. On this example we would using FileReader. The intention is to read the contents of a file and output it to the console. Though I prefer using the Scanner to read fileusing BufferedReader had some benefits.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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Basic Java Programs Using BufferedReader

And here is the main program that supposed to be the input and output of the program. It's really not clear what you're trying to do here. Why doesn't add take two arguments for instance? However, I would encourage you to use return values and use parameters :. Same goes for the total that should be the return of your function.

Since you're beginning, I will not point out the design flaws. Your problem comes from how you are using your read values.

Java BufferedReader Example

You read values into num1 and num2, but you never set them in your mathclass object: math1. I would also encourage you to encapsulate your classes and use parameters and return values whenever possible.

Good luck in learning java, and I hope this helped! Learn more. Ask Question. Asked 7 years, 10 months ago. Active 7 years, 10 months ago. Viewed 28k times.

java program to add two numbers using bufferedreader

Two very different problems are using a BufferedReader to get values from user to program, and to get values from your main method to the class is doing the work. As aioobe says, yo must pass these values. Otherwise this x and y fields in the created object remain with default initial values 0 and nothing happens. I mean. If you don't say: let the x field in the math1 object have the value of num1 recently obtained value it won't magically do that.

Active Oldest Votes. Well, yes.


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