how to split first and last name in string array in java
0
I have an array contains 15 full names, how do I break it into 2 arrays(first and last name) below is the method for my full name array
public static void readData(String file) throws FileNotFoundException
x = new Scanner(new File(file));
//count number of names in the array
int n = 0;
while(x.hasNextLine())
n++;
x.nextLine();
//open another scanner to avoid null
Scanner x1 = new Scanner(new File(file));
name = new String[n];
//get the array and print
for(int i = 0; i < name.length; i++ )
name[i] = x1.nextLine();
System.out.println(Arrays.toString(name));
java arrays string split
asked Nov 15 '18 at 4:08
James PJames P
102
add a comment |
0
I have an array contains 15 full names, how do I break it into 2 arrays(first and last name) below is the method for my full name array
public static void readData(String file) throws FileNotFoundException
x = new Scanner(new File(file));
//count number of names in the array
int n = 0;
while(x.hasNextLine())
n++;
x.nextLine();
//open another scanner to avoid null
Scanner x1 = new Scanner(new File(file));
name = new String[n];
//get the array and print
for(int i = 0; i < name.length; i++ )
name[i] = x1.nextLine();
System.out.println(Arrays.toString(name));
java arrays string split
asked Nov 15 '18 at 4:08
James PJames P
102
Create two arrays. When you read theStringfrom the file, split on the delimiter, I assume which is a "space", then add each element to the corresponding arrays
– MadProgrammer
Nov 15 '18 at 4:11
2
Just out of curiosity, why are you opening "another scanner to avoid null"? Seems entirely unnecessary.
– Carcigenicate
Nov 15 '18 at 4:11
1
Why are you reading this into an array at all? Just split and print in one pass. Also you leak not one but two file handles!
– Elliott Frisch
Nov 15 '18 at 4:11
@Carcigenicate Looking at the code, they are trying to determine the number of lines in the file ahead of time ... They'd need to reset theScannerto the start of the file, which is why I assume they're using two scanners, but not closing either ... and generally making a mess (and I doubt it would be a NPE)
– MadProgrammer
Nov 15 '18 at 4:14
add a comment |
0
0
0
I have an array contains 15 full names, how do I break it into 2 arrays(first and last name) below is the method for my full name array
public static void readData(String file) throws FileNotFoundException
x = new Scanner(new File(file));
//count number of names in the array
int n = 0;
while(x.hasNextLine())
n++;
x.nextLine();
//open another scanner to avoid null
Scanner x1 = new Scanner(new File(file));
name = new String[n];
//get the array and print
for(int i = 0; i < name.length; i++ )
name[i] = x1.nextLine();
System.out.println(Arrays.toString(name));
java arrays string split
asked Nov 15 '18 at 4:08
James PJames P
102
I have an array contains 15 full names, how do I break it into 2 arrays(first and last name) below is the method for my full name array
public static void readData(String file) throws FileNotFoundException
x = new Scanner(new File(file));
//count number of names in the array
int n = 0;
while(x.hasNextLine())
n++;
x.nextLine();
//open another scanner to avoid null
Scanner x1 = new Scanner(new File(file));
name = new String[n];
//get the array and print
for(int i = 0; i < name.length; i++ )
name[i] = x1.nextLine();
System.out.println(Arrays.toString(name));
java arrays string split
java arrays string split
asked Nov 15 '18 at 4:08
James PJames P
102
asked Nov 15 '18 at 4:08
James PJames P
102
asked Nov 15 '18 at 4:08
James PJames P
102
asked Nov 15 '18 at 4:08
James PJames P
102
asked Nov 15 '18 at 4:08
James PJames P
102
102
Create two arrays. When you read theStringfrom the file, split on the delimiter, I assume which is a "space", then add each element to the corresponding arrays
– MadProgrammer
Nov 15 '18 at 4:11
2
Just out of curiosity, why are you opening "another scanner to avoid null"? Seems entirely unnecessary.
– Carcigenicate
Nov 15 '18 at 4:11
1
Why are you reading this into an array at all? Just split and print in one pass. Also you leak not one but two file handles!
– Elliott Frisch
Nov 15 '18 at 4:11
@Carcigenicate Looking at the code, they are trying to determine the number of lines in the file ahead of time ... They'd need to reset theScannerto the start of the file, which is why I assume they're using two scanners, but not closing either ... and generally making a mess (and I doubt it would be a NPE)
– MadProgrammer
Nov 15 '18 at 4:14
add a comment |
Create two arrays. When you read theStringfrom the file, split on the delimiter, I assume which is a "space", then add each element to the corresponding arrays
– MadProgrammer
Nov 15 '18 at 4:11
2
Just out of curiosity, why are you opening "another scanner to avoid null"? Seems entirely unnecessary.
– Carcigenicate
Nov 15 '18 at 4:11
1
Why are you reading this into an array at all? Just split and print in one pass. Also you leak not one but two file handles!
– Elliott Frisch
Nov 15 '18 at 4:11
@Carcigenicate Looking at the code, they are trying to determine the number of lines in the file ahead of time ... They'd need to reset theScannerto the start of the file, which is why I assume they're using two scanners, but not closing either ... and generally making a mess (and I doubt it would be a NPE)
– MadProgrammer
Nov 15 '18 at 4:14
Create two arrays. When you read the
String from the file, split on the delimiter, I assume which is a "space", then add each element to the corresponding arrays– MadProgrammer
Nov 15 '18 at 4:11
Create two arrays. When you read the
String from the file, split on the delimiter, I assume which is a "space", then add each element to the corresponding arrays– MadProgrammer
Nov 15 '18 at 4:11
2
2
Just out of curiosity, why are you opening "another scanner to avoid null"? Seems entirely unnecessary.
– Carcigenicate
Nov 15 '18 at 4:11
Just out of curiosity, why are you opening "another scanner to avoid null"? Seems entirely unnecessary.
– Carcigenicate
Nov 15 '18 at 4:11
1
1
Why are you reading this into an array at all? Just split and print in one pass. Also you leak not one but two file handles!
– Elliott Frisch
Nov 15 '18 at 4:11
Why are you reading this into an array at all? Just split and print in one pass. Also you leak not one but two file handles!
– Elliott Frisch
Nov 15 '18 at 4:11
@Carcigenicate Looking at the code, they are trying to determine the number of lines in the file ahead of time ... They'd need to reset the
Scanner to the start of the file, which is why I assume they're using two scanners, but not closing either ... and generally making a mess (and I doubt it would be a NPE)– MadProgrammer
Nov 15 '18 at 4:14
@Carcigenicate Looking at the code, they are trying to determine the number of lines in the file ahead of time ... They'd need to reset the
Scanner to the start of the file, which is why I assume they're using two scanners, but not closing either ... and generally making a mess (and I doubt it would be a NPE)– MadProgrammer
Nov 15 '18 at 4:14
add a comment |
1 Answer
1
active
oldest
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0
File contains 15 full names like this:
Max Frei
Stephen King
Agatha Christie
How to read:
final int total = 15;
String firstNames = new String[total];
String lastNames = new String[total];
try (Scanner scan = new Scanner(new File("file")))
for (int i = 0; i < total; i++)
firstNames[i] = scan.next();
lastNames[i] = scan.next();
// firstNames: Max, Stephen, Agatha
// lastNames: Frei, King, Christie
answered Nov 15 '18 at 4:55
oleg.cherednikoleg.cherednik
7,10021119
I also want to make sure that I understood this correctly. The key is to use scan,next() instead of nextLine(). When you do scan.next() it will assign the first name to firstName, then the next one to lastName, then repeat the cycle in for-loop, so my String name is actually irrelevant in this case. Is that correct?
– James P
Nov 15 '18 at 5:33
nextLine() to read whole line, next() to read until next delimiter
– oleg.cherednik
Nov 15 '18 at 5:40
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
0
File contains 15 full names like this:
Max Frei
Stephen King
Agatha Christie
How to read:
final int total = 15;
String firstNames = new String[total];
String lastNames = new String[total];
try (Scanner scan = new Scanner(new File("file")))
for (int i = 0; i < total; i++)
firstNames[i] = scan.next();
lastNames[i] = scan.next();
// firstNames: Max, Stephen, Agatha
// lastNames: Frei, King, Christie
answered Nov 15 '18 at 4:55
oleg.cherednikoleg.cherednik
7,10021119
I also want to make sure that I understood this correctly. The key is to use scan,next() instead of nextLine(). When you do scan.next() it will assign the first name to firstName, then the next one to lastName, then repeat the cycle in for-loop, so my String name is actually irrelevant in this case. Is that correct?
– James P
Nov 15 '18 at 5:33
nextLine() to read whole line, next() to read until next delimiter
– oleg.cherednik
Nov 15 '18 at 5:40
add a comment |
0
File contains 15 full names like this:
Max Frei
Stephen King
Agatha Christie
How to read:
final int total = 15;
String firstNames = new String[total];
String lastNames = new String[total];
try (Scanner scan = new Scanner(new File("file")))
for (int i = 0; i < total; i++)
firstNames[i] = scan.next();
lastNames[i] = scan.next();
// firstNames: Max, Stephen, Agatha
// lastNames: Frei, King, Christie
answered Nov 15 '18 at 4:55
oleg.cherednikoleg.cherednik
7,10021119
I also want to make sure that I understood this correctly. The key is to use scan,next() instead of nextLine(). When you do scan.next() it will assign the first name to firstName, then the next one to lastName, then repeat the cycle in for-loop, so my String name is actually irrelevant in this case. Is that correct?
– James P
Nov 15 '18 at 5:33
nextLine() to read whole line, next() to read until next delimiter
– oleg.cherednik
Nov 15 '18 at 5:40
add a comment |
0
0
0
File contains 15 full names like this:
Max Frei
Stephen King
Agatha Christie
How to read:
final int total = 15;
String firstNames = new String[total];
String lastNames = new String[total];
try (Scanner scan = new Scanner(new File("file")))
for (int i = 0; i < total; i++)
firstNames[i] = scan.next();
lastNames[i] = scan.next();
// firstNames: Max, Stephen, Agatha
// lastNames: Frei, King, Christie
answered Nov 15 '18 at 4:55
oleg.cherednikoleg.cherednik
7,10021119
File contains 15 full names like this:
Max Frei
Stephen King
Agatha Christie
How to read:
final int total = 15;
String firstNames = new String[total];
String lastNames = new String[total];
try (Scanner scan = new Scanner(new File("file")))
for (int i = 0; i < total; i++)
firstNames[i] = scan.next();
lastNames[i] = scan.next();
// firstNames: Max, Stephen, Agatha
// lastNames: Frei, King, Christie
answered Nov 15 '18 at 4:55
oleg.cherednikoleg.cherednik
7,10021119
answered Nov 15 '18 at 4:55
oleg.cherednikoleg.cherednik
7,10021119
answered Nov 15 '18 at 4:55
oleg.cherednikoleg.cherednik
7,10021119
answered Nov 15 '18 at 4:55
oleg.cherednikoleg.cherednik
7,10021119
7,10021119
I also want to make sure that I understood this correctly. The key is to use scan,next() instead of nextLine(). When you do scan.next() it will assign the first name to firstName, then the next one to lastName, then repeat the cycle in for-loop, so my String name is actually irrelevant in this case. Is that correct?
– James P
Nov 15 '18 at 5:33
nextLine() to read whole line, next() to read until next delimiter
– oleg.cherednik
Nov 15 '18 at 5:40
add a comment |
I also want to make sure that I understood this correctly. The key is to use scan,next() instead of nextLine(). When you do scan.next() it will assign the first name to firstName, then the next one to lastName, then repeat the cycle in for-loop, so my String name is actually irrelevant in this case. Is that correct?
– James P
Nov 15 '18 at 5:33
nextLine() to read whole line, next() to read until next delimiter
– oleg.cherednik
Nov 15 '18 at 5:40
I also want to make sure that I understood this correctly. The key is to use scan,next() instead of nextLine(). When you do scan.next() it will assign the first name to firstName, then the next one to lastName, then repeat the cycle in for-loop, so my String name is actually irrelevant in this case. Is that correct?
– James P
Nov 15 '18 at 5:33
I also want to make sure that I understood this correctly. The key is to use scan,next() instead of nextLine(). When you do scan.next() it will assign the first name to firstName, then the next one to lastName, then repeat the cycle in for-loop, so my String name is actually irrelevant in this case. Is that correct?
– James P
Nov 15 '18 at 5:33
nextLine() to read whole line, next() to read until next delimiter
– oleg.cherednik
Nov 15 '18 at 5:40
nextLine() to read whole line, next() to read until next delimiter
– oleg.cherednik
Nov 15 '18 at 5:40
add a comment |
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Create two arrays. When you read the
Stringfrom the file, split on the delimiter, I assume which is a "space", then add each element to the corresponding arrays– MadProgrammer
Nov 15 '18 at 4:11
2
Just out of curiosity, why are you opening "another scanner to avoid null"? Seems entirely unnecessary.
– Carcigenicate
Nov 15 '18 at 4:11
1
Why are you reading this into an array at all? Just split and print in one pass. Also you leak not one but two file handles!
– Elliott Frisch
Nov 15 '18 at 4:11
@Carcigenicate Looking at the code, they are trying to determine the number of lines in the file ahead of time ... They'd need to reset the
Scannerto the start of the file, which is why I assume they're using two scanners, but not closing either ... and generally making a mess (and I doubt it would be a NPE)– MadProgrammer
Nov 15 '18 at 4:14