Converting a Scanner File into a String that contains the entire file output in Java
I am working on a MabLibs project that is supposed to iterate through a file, prompt you with anything contained in a <> block and allow you to write over to a new file.
I cannot figure out how to use a Scanner to read a file and turn that into a string so I can use the .length() method to iterate a for loop through the file to find these <> blocks.
I can only use Scanner and can't use array lists, so unfortunately the for loop is the only way I can do this.
Here's the code:
import java.io.*;
import java.util.*;
public class MadLibs
public static void main(String args)
throws FileNotFoundException
intro();
madLib();
public static void intro()
System.out.println("Welcome to the game of Mad Libs.");
System.out.println("I will ask you to provide various words");
System.out.println("and phrases to fill in a story.");
System.out.println("The result will be written to an output file.");
System.out.println();
public static void madLib() throws FileNotFoundException r.equalsIgnoreCase("q")))
System.out.println("(C)reate mad-lib, (V)iew mad-lib, (Q)uit? ");
if (r.equalsIgnoreCase("v"))
viewFile();
else if (r.equalsIgnoreCase("c"))
createWord();
public static void createWord() throws FileNotFoundException
System.out.println("Input file name: ");
Scanner viewFile = new Scanner(System.in);
String toRead = viewFile.nextLine();
File f = new File(toRead);
while (!f.exists())
System.out.println("File Not Found. Try again: ");
toRead = viewFile.nextLine();
f = new File(toRead);
Scanner input1 = new Scanner(new File(toRead));
String input2 = input1;
PrintStream output = new PrintStream(new File(toRead));
while (input1.hasNext())
String input = input1.next();
for (int i = 0; i < input2.length(); i++)
if (input.startsWith("<") && input.endsWith(">"))
String token = input.substring(1, input.length() - 1);
System.out.println("Please input a: " + token);
Scanner scan = new Scanner(System.in);
String replacement = scan.nextLine();
token = token.replace(token, replacement);
output.print(token);
public static void viewFile() throws FileNotFoundException
System.out.println("Input file name: ");
Scanner viewFile = new Scanner(System.in);
String toRead = viewFile.nextLine();
File f = new File(toRead);
while (!f.exists())
System.out.println("File Not Found. Try again: ");
toRead = viewFile.nextLine();
f = new File(toRead);
Scanner input1 = new Scanner(new File(toRead));
System.out.println();
while (input1.hasNextLine())
System.out.println(input1.nextLine());
Any help is greatly appreciated.
java string loops
add a comment |
I am working on a MabLibs project that is supposed to iterate through a file, prompt you with anything contained in a <> block and allow you to write over to a new file.
I cannot figure out how to use a Scanner to read a file and turn that into a string so I can use the .length() method to iterate a for loop through the file to find these <> blocks.
I can only use Scanner and can't use array lists, so unfortunately the for loop is the only way I can do this.
Here's the code:
import java.io.*;
import java.util.*;
public class MadLibs
public static void main(String args)
throws FileNotFoundException
intro();
madLib();
public static void intro()
System.out.println("Welcome to the game of Mad Libs.");
System.out.println("I will ask you to provide various words");
System.out.println("and phrases to fill in a story.");
System.out.println("The result will be written to an output file.");
System.out.println();
public static void madLib() throws FileNotFoundException r.equalsIgnoreCase("q")))
System.out.println("(C)reate mad-lib, (V)iew mad-lib, (Q)uit? ");
if (r.equalsIgnoreCase("v"))
viewFile();
else if (r.equalsIgnoreCase("c"))
createWord();
public static void createWord() throws FileNotFoundException
System.out.println("Input file name: ");
Scanner viewFile = new Scanner(System.in);
String toRead = viewFile.nextLine();
File f = new File(toRead);
while (!f.exists())
System.out.println("File Not Found. Try again: ");
toRead = viewFile.nextLine();
f = new File(toRead);
Scanner input1 = new Scanner(new File(toRead));
String input2 = input1;
PrintStream output = new PrintStream(new File(toRead));
while (input1.hasNext())
String input = input1.next();
for (int i = 0; i < input2.length(); i++)
if (input.startsWith("<") && input.endsWith(">"))
String token = input.substring(1, input.length() - 1);
System.out.println("Please input a: " + token);
Scanner scan = new Scanner(System.in);
String replacement = scan.nextLine();
token = token.replace(token, replacement);
output.print(token);
public static void viewFile() throws FileNotFoundException
System.out.println("Input file name: ");
Scanner viewFile = new Scanner(System.in);
String toRead = viewFile.nextLine();
File f = new File(toRead);
while (!f.exists())
System.out.println("File Not Found. Try again: ");
toRead = viewFile.nextLine();
f = new File(toRead);
Scanner input1 = new Scanner(new File(toRead));
System.out.println();
while (input1.hasNextLine())
System.out.println(input1.nextLine());
Any help is greatly appreciated.
java string loops
1
The standard way to toopen fileA
loop
read line
change line
write to fileB
end loop
rename fileB to fileA
– Scary Wombat
Nov 13 '18 at 1:08
Maybe the whole line is not quoted with<...>
so use some regex to replace<....>
with your new content
– Scary Wombat
Nov 13 '18 at 1:09
1
does this compile first, i believe you should get compilation errorScanner input1 = new Scanner(new File(toRead)); String input2 = input1;
– Deadpool
Nov 13 '18 at 1:18
add a comment |
I am working on a MabLibs project that is supposed to iterate through a file, prompt you with anything contained in a <> block and allow you to write over to a new file.
I cannot figure out how to use a Scanner to read a file and turn that into a string so I can use the .length() method to iterate a for loop through the file to find these <> blocks.
I can only use Scanner and can't use array lists, so unfortunately the for loop is the only way I can do this.
Here's the code:
import java.io.*;
import java.util.*;
public class MadLibs
public static void main(String args)
throws FileNotFoundException
intro();
madLib();
public static void intro()
System.out.println("Welcome to the game of Mad Libs.");
System.out.println("I will ask you to provide various words");
System.out.println("and phrases to fill in a story.");
System.out.println("The result will be written to an output file.");
System.out.println();
public static void madLib() throws FileNotFoundException r.equalsIgnoreCase("q")))
System.out.println("(C)reate mad-lib, (V)iew mad-lib, (Q)uit? ");
if (r.equalsIgnoreCase("v"))
viewFile();
else if (r.equalsIgnoreCase("c"))
createWord();
public static void createWord() throws FileNotFoundException
System.out.println("Input file name: ");
Scanner viewFile = new Scanner(System.in);
String toRead = viewFile.nextLine();
File f = new File(toRead);
while (!f.exists())
System.out.println("File Not Found. Try again: ");
toRead = viewFile.nextLine();
f = new File(toRead);
Scanner input1 = new Scanner(new File(toRead));
String input2 = input1;
PrintStream output = new PrintStream(new File(toRead));
while (input1.hasNext())
String input = input1.next();
for (int i = 0; i < input2.length(); i++)
if (input.startsWith("<") && input.endsWith(">"))
String token = input.substring(1, input.length() - 1);
System.out.println("Please input a: " + token);
Scanner scan = new Scanner(System.in);
String replacement = scan.nextLine();
token = token.replace(token, replacement);
output.print(token);
public static void viewFile() throws FileNotFoundException
System.out.println("Input file name: ");
Scanner viewFile = new Scanner(System.in);
String toRead = viewFile.nextLine();
File f = new File(toRead);
while (!f.exists())
System.out.println("File Not Found. Try again: ");
toRead = viewFile.nextLine();
f = new File(toRead);
Scanner input1 = new Scanner(new File(toRead));
System.out.println();
while (input1.hasNextLine())
System.out.println(input1.nextLine());
Any help is greatly appreciated.
java string loops
I am working on a MabLibs project that is supposed to iterate through a file, prompt you with anything contained in a <> block and allow you to write over to a new file.
I cannot figure out how to use a Scanner to read a file and turn that into a string so I can use the .length() method to iterate a for loop through the file to find these <> blocks.
I can only use Scanner and can't use array lists, so unfortunately the for loop is the only way I can do this.
Here's the code:
import java.io.*;
import java.util.*;
public class MadLibs
public static void main(String args)
throws FileNotFoundException
intro();
madLib();
public static void intro()
System.out.println("Welcome to the game of Mad Libs.");
System.out.println("I will ask you to provide various words");
System.out.println("and phrases to fill in a story.");
System.out.println("The result will be written to an output file.");
System.out.println();
public static void madLib() throws FileNotFoundException r.equalsIgnoreCase("q")))
System.out.println("(C)reate mad-lib, (V)iew mad-lib, (Q)uit? ");
if (r.equalsIgnoreCase("v"))
viewFile();
else if (r.equalsIgnoreCase("c"))
createWord();
public static void createWord() throws FileNotFoundException
System.out.println("Input file name: ");
Scanner viewFile = new Scanner(System.in);
String toRead = viewFile.nextLine();
File f = new File(toRead);
while (!f.exists())
System.out.println("File Not Found. Try again: ");
toRead = viewFile.nextLine();
f = new File(toRead);
Scanner input1 = new Scanner(new File(toRead));
String input2 = input1;
PrintStream output = new PrintStream(new File(toRead));
while (input1.hasNext())
String input = input1.next();
for (int i = 0; i < input2.length(); i++)
if (input.startsWith("<") && input.endsWith(">"))
String token = input.substring(1, input.length() - 1);
System.out.println("Please input a: " + token);
Scanner scan = new Scanner(System.in);
String replacement = scan.nextLine();
token = token.replace(token, replacement);
output.print(token);
public static void viewFile() throws FileNotFoundException
System.out.println("Input file name: ");
Scanner viewFile = new Scanner(System.in);
String toRead = viewFile.nextLine();
File f = new File(toRead);
while (!f.exists())
System.out.println("File Not Found. Try again: ");
toRead = viewFile.nextLine();
f = new File(toRead);
Scanner input1 = new Scanner(new File(toRead));
System.out.println();
while (input1.hasNextLine())
System.out.println(input1.nextLine());
Any help is greatly appreciated.
java string loops
java string loops
edited Nov 13 '18 at 1:10
Deadpool
4,4692326
4,4692326
asked Nov 13 '18 at 1:03
N.SpiessN.Spiess
212
212
1
The standard way to toopen fileA
loop
read line
change line
write to fileB
end loop
rename fileB to fileA
– Scary Wombat
Nov 13 '18 at 1:08
Maybe the whole line is not quoted with<...>
so use some regex to replace<....>
with your new content
– Scary Wombat
Nov 13 '18 at 1:09
1
does this compile first, i believe you should get compilation errorScanner input1 = new Scanner(new File(toRead)); String input2 = input1;
– Deadpool
Nov 13 '18 at 1:18
add a comment |
1
The standard way to toopen fileA
loop
read line
change line
write to fileB
end loop
rename fileB to fileA
– Scary Wombat
Nov 13 '18 at 1:08
Maybe the whole line is not quoted with<...>
so use some regex to replace<....>
with your new content
– Scary Wombat
Nov 13 '18 at 1:09
1
does this compile first, i believe you should get compilation errorScanner input1 = new Scanner(new File(toRead)); String input2 = input1;
– Deadpool
Nov 13 '18 at 1:18
1
1
The standard way to to
open fileA
loop
read line
change line
write to fileB
end loop
rename fileB to fileA
– Scary Wombat
Nov 13 '18 at 1:08
The standard way to to
open fileA
loop
read line
change line
write to fileB
end loop
rename fileB to fileA
– Scary Wombat
Nov 13 '18 at 1:08
Maybe the whole line is not quoted with
<...>
so use some regex to replace <....>
with your new content– Scary Wombat
Nov 13 '18 at 1:09
Maybe the whole line is not quoted with
<...>
so use some regex to replace <....>
with your new content– Scary Wombat
Nov 13 '18 at 1:09
1
1
does this compile first, i believe you should get compilation error
Scanner input1 = new Scanner(new File(toRead)); String input2 = input1;
– Deadpool
Nov 13 '18 at 1:18
does this compile first, i believe you should get compilation error
Scanner input1 = new Scanner(new File(toRead)); String input2 = input1;
– Deadpool
Nov 13 '18 at 1:18
add a comment |
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1
The standard way to to
open fileA
loop
read line
change line
write to fileB
end loop
rename fileB to fileA
– Scary Wombat
Nov 13 '18 at 1:08
Maybe the whole line is not quoted with
<...>
so use some regex to replace<....>
with your new content– Scary Wombat
Nov 13 '18 at 1:09
1
does this compile first, i believe you should get compilation error
Scanner input1 = new Scanner(new File(toRead)); String input2 = input1;
– Deadpool
Nov 13 '18 at 1:18