Life is full of decisions that you will make depending on certain conditions, computers are no different. IF the day is a Saturday AND the alarm clock goes off THEN you might turn it off and stay in bed OTHERWISE you might get up. IF you wake up in the morning and it is raining THEN you will take a coat to school OTHERWISE you wont. Sometimes you will change what do you depending on the conditions. Can anyone give me some suggestions? Thanks a lot.#three variables that store the two inputs and also the value of pie radius = float ( input ( "Enter the cylinder radius: " )) height = float ( input ( "Enter the cylinder height: " )) pie = 3.14159 #calculations to work out the volume and surface area volume = pie * ( radius * radius ) * height surface = ( 2 * ( pie * ( radius * radius ))) + ( 2 * ( pie * radius * height )) #outputs the volume and surface area of the cylinder print ( "The volume of your cylinder is", round ( volume, 2 ), "to 2 decimal places" ) print ( "The surface area of your cylinder is", round ( surface, 2 ), "to 2 decimal places" ) ![]() Below is an example java source code, but it does not work as expected when I run it.I want to save the above log text output to a log file instead of printing them on the console.And my java program generates a lot of log output text on the console screen using the method () (4). Why My Java Code Can Not Write Console Output To A Local Log Text File. Close the above writer object to close the file. Print the error text to an err.txt file.įileWriter fw = new FileWriter("err.txt") Print the error text to system.out command line console. String text = line + " is not a valid email address.\r\n" Do not forget close the above writers to close the file pointer. Print the user input email address to a text file.įileWriter fw = new FileWriter("out.txt") Print the text to system.out command line console. String text = line + " is a valid email address.\r\n" Get user input text line from the command line console. Create a BufferedWriter object to write text to system.out.īufferedWriter bw = new BufferedWriter(osw) īw.write("Please input a valid email address.\r\n") Create a BufferedReader object and use this object to connect to the system.in(command line console) to get user input text.īufferedReader br = new BufferedReader(isr) OutputStreamWriter osw = new OutputStreamWriter(System.out) Create an instance of OutputStreamWriter class, it is used to write text to command line console. InputStreamReader isr = new InputStreamReader(System.in) Create an instance of InputStreamReader class, it is used to read user input from command line console. Below is another method to write user input in the command line console to a text file in java.After executing the above code, you can see two files out.txt and err.txt are generated under the current java class execution folder.Private static boolean isValidEmail(String email) * Check whether the string is an email address or not. Do not forget set original output and error stream back again. OriginalOut.println("Email " + line + " is valid. If user input a valid email then write the email to. ("Email " + line + " is not a valid email. OriginalErr.println("Email " + line + " is not a valid email. If user input is not a valid email then write log data to. If user input 'quit' then break the loop. OriginalOut.println("Please input your email. Scanner scanner = new Scanner(System.in) PrintStream fileErr = new PrintStream("./err.txt") PrintStream fileOut = new PrintStream("./out.txt") Below is the full example source code.Write Console Output To Text File In Java Examples. Call tOut method to set above PrintStream as the new standard output stream.Below are the steps of redirecting the output stream to the file stream. ![]() setIn(InputStream is): Set standard input stream to a custom input stream.setErr(PrintStream ps): Set standard error output to a specified print stream such as a file stream.setOut(PrintStream ps): Set standard data output to a specified print stream such as a file stream.The class provides the below methods to set standard output stream to custom stream.Redirect Java System Output Stream Methods.
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