Auto-generate variable size 2D array from 1D arrays
I am looking for some advice on how I can create a method that generates a 2D array based two parameters, an integer s that will dictate the number of rows of the 2D array and int x would be where different 1D arrays of length 20 will fill each row of the 2D array. So far this the the method that I came up with but it only fills each row with 0s only one row is filled with the input array. I basically need a to fill each row of a autogenerated 2D array with a bunch of same sized 1D arrays. please help. thx !
public class c {
public int f;
public int a(int x, int s){
f = new int [s][20];
for(int j = 0; j < x.length; j++) {
f[s-1][j] = x[j];
}
return f;
}
public void d(){
for (int i =0; i < f.length; i++) {
for(int j = 0; j < f[i].length; j++) {
System.out.print(f[i][j] + " ");
}
System.out.println(" ");
}
}
}
java arrays multidimensional-array methods
edited Nov 12 '18 at 7:18
Deedar Ali Brohi
21519
asked Nov 12 '18 at 6:57
Sam D
1
add a comment |
I am looking for some advice on how I can create a method that generates a 2D array based two parameters, an integer s that will dictate the number of rows of the 2D array and int x would be where different 1D arrays of length 20 will fill each row of the 2D array. So far this the the method that I came up with but it only fills each row with 0s only one row is filled with the input array. I basically need a to fill each row of a autogenerated 2D array with a bunch of same sized 1D arrays. please help. thx !
public class c {
public int f;
public int a(int x, int s){
f = new int [s][20];
for(int j = 0; j < x.length; j++) {
f[s-1][j] = x[j];
}
return f;
}
public void d(){
for (int i =0; i < f.length; i++) {
for(int j = 0; j < f[i].length; j++) {
System.out.print(f[i][j] + " ");
}
System.out.println(" ");
}
}
}
java arrays multidimensional-array methods
edited Nov 12 '18 at 7:18
Deedar Ali Brohi
21519
asked Nov 12 '18 at 6:57
Sam D
1
You are initializing only one row f[s-1][j] = x[j]; and each time a() function is called you are creating new 2D array and initializing only one row in it.
– Hrudayanath
Nov 12 '18 at 7:07
Possible duplicate of How to convert a 1d array to 2d array?
– LuCio
Nov 12 '18 at 8:42
add a comment |
I am looking for some advice on how I can create a method that generates a 2D array based two parameters, an integer s that will dictate the number of rows of the 2D array and int x would be where different 1D arrays of length 20 will fill each row of the 2D array. So far this the the method that I came up with but it only fills each row with 0s only one row is filled with the input array. I basically need a to fill each row of a autogenerated 2D array with a bunch of same sized 1D arrays. please help. thx !
public class c {
public int f;
public int a(int x, int s){
f = new int [s][20];
for(int j = 0; j < x.length; j++) {
f[s-1][j] = x[j];
}
return f;
}
public void d(){
for (int i =0; i < f.length; i++) {
for(int j = 0; j < f[i].length; j++) {
System.out.print(f[i][j] + " ");
}
System.out.println(" ");
}
}
}
java arrays multidimensional-array methods
edited Nov 12 '18 at 7:18
Deedar Ali Brohi
21519
asked Nov 12 '18 at 6:57
Sam D
1
I am looking for some advice on how I can create a method that generates a 2D array based two parameters, an integer s that will dictate the number of rows of the 2D array and int x would be where different 1D arrays of length 20 will fill each row of the 2D array. So far this the the method that I came up with but it only fills each row with 0s only one row is filled with the input array. I basically need a to fill each row of a autogenerated 2D array with a bunch of same sized 1D arrays. please help. thx !
public class c {
public int f;
public int a(int x, int s){
f = new int [s][20];
for(int j = 0; j < x.length; j++) {
f[s-1][j] = x[j];
}
return f;
}
public void d(){
for (int i =0; i < f.length; i++) {
for(int j = 0; j < f[i].length; j++) {
System.out.print(f[i][j] + " ");
}
System.out.println(" ");
}
}
}
java arrays multidimensional-array methods
java arrays multidimensional-array methods
edited Nov 12 '18 at 7:18
Deedar Ali Brohi
21519
asked Nov 12 '18 at 6:57
Sam D
1
edited Nov 12 '18 at 7:18
Deedar Ali Brohi
21519
asked Nov 12 '18 at 6:57
Sam D
1
edited Nov 12 '18 at 7:18
Deedar Ali Brohi
21519
edited Nov 12 '18 at 7:18
Deedar Ali Brohi
21519
edited Nov 12 '18 at 7:18
Deedar Ali Brohi
21519
21519
asked Nov 12 '18 at 6:57
Sam D
1
asked Nov 12 '18 at 6:57
Sam D
1
asked Nov 12 '18 at 6:57
Sam D
1
1
You are initializing only one row f[s-1][j] = x[j]; and each time a() function is called you are creating new 2D array and initializing only one row in it.
– Hrudayanath
Nov 12 '18 at 7:07
Possible duplicate of How to convert a 1d array to 2d array?
– LuCio
Nov 12 '18 at 8:42
add a comment |
You are initializing only one row f[s-1][j] = x[j]; and each time a() function is called you are creating new 2D array and initializing only one row in it.
– Hrudayanath
Nov 12 '18 at 7:07
Possible duplicate of How to convert a 1d array to 2d array?
– LuCio
Nov 12 '18 at 8:42
You are initializing only one row f[s-1][j] = x[j]; and each time a() function is called you are creating new 2D array and initializing only one row in it.
– Hrudayanath
Nov 12 '18 at 7:07
You are initializing only one row f[s-1][j] = x[j]; and each time a() function is called you are creating new 2D array and initializing only one row in it.
– Hrudayanath
Nov 12 '18 at 7:07
Possible duplicate of How to convert a 1d array to 2d array?
– LuCio
Nov 12 '18 at 8:42
Possible duplicate of How to convert a 1d array to 2d array?
– LuCio
Nov 12 '18 at 8:42
add a comment |
2 Answers
2
active
oldest
votes
This can be achieved using stream api in java
int arrInt = { { 1, 2 }, { 3, 4, 5 } };
int result = Arrays.stream(arrInt).flatMapToInt(Arrays::stream).toArray();
System.out.println(Arrays.toString(result));
answered Nov 12 '18 at 8:30
Navin Gelot
2531216
add a comment |
I can see, that all you need to do is just create 2D array with given number of rows and copy given 1D array to the to the each row. This is pretty simple:
- Create new 2D array
- Iterate over each row and put given array into it
Example:
public static int createArray(int arr, int totalRows) {
int res = new int[totalRows][arr.length];
for (int row = 0; row < totalRows; row++)
System.arraycopy(arr, 0, res[row], 0, res[row].length);
return res;
}
answered Nov 12 '18 at 7:23
oleg.cherednik
5,87821017
Code only answers arent encouraged as they dont provide much information for future readers please provide some explanation to what you have written
– WhatsThePoint
Nov 12 '18 at 8:29
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
This can be achieved using stream api in java
int arrInt = { { 1, 2 }, { 3, 4, 5 } };
int result = Arrays.stream(arrInt).flatMapToInt(Arrays::stream).toArray();
System.out.println(Arrays.toString(result));
answered Nov 12 '18 at 8:30
Navin Gelot
2531216
add a comment |
This can be achieved using stream api in java
int arrInt = { { 1, 2 }, { 3, 4, 5 } };
int result = Arrays.stream(arrInt).flatMapToInt(Arrays::stream).toArray();
System.out.println(Arrays.toString(result));
answered Nov 12 '18 at 8:30
Navin Gelot
2531216
add a comment |
This can be achieved using stream api in java
int arrInt = { { 1, 2 }, { 3, 4, 5 } };
int result = Arrays.stream(arrInt).flatMapToInt(Arrays::stream).toArray();
System.out.println(Arrays.toString(result));
answered Nov 12 '18 at 8:30
Navin Gelot
2531216
This can be achieved using stream api in java
int arrInt = { { 1, 2 }, { 3, 4, 5 } };
int result = Arrays.stream(arrInt).flatMapToInt(Arrays::stream).toArray();
System.out.println(Arrays.toString(result));
answered Nov 12 '18 at 8:30
Navin Gelot
2531216
edited Nov 12 '18 at 8:38
answered Nov 12 '18 at 8:30
Navin Gelot
2531216
answered Nov 12 '18 at 8:30
Navin Gelot
2531216
answered Nov 12 '18 at 8:30
Navin Gelot
2531216
2531216
add a comment |
add a comment |
I can see, that all you need to do is just create 2D array with given number of rows and copy given 1D array to the to the each row. This is pretty simple:
- Create new 2D array
- Iterate over each row and put given array into it
Example:
public static int createArray(int arr, int totalRows) {
int res = new int[totalRows][arr.length];
for (int row = 0; row < totalRows; row++)
System.arraycopy(arr, 0, res[row], 0, res[row].length);
return res;
}
answered Nov 12 '18 at 7:23
oleg.cherednik
5,87821017
Code only answers arent encouraged as they dont provide much information for future readers please provide some explanation to what you have written
– WhatsThePoint
Nov 12 '18 at 8:29
add a comment |
I can see, that all you need to do is just create 2D array with given number of rows and copy given 1D array to the to the each row. This is pretty simple:
- Create new 2D array
- Iterate over each row and put given array into it
Example:
public static int createArray(int arr, int totalRows) {
int res = new int[totalRows][arr.length];
for (int row = 0; row < totalRows; row++)
System.arraycopy(arr, 0, res[row], 0, res[row].length);
return res;
}
answered Nov 12 '18 at 7:23
oleg.cherednik
5,87821017
Code only answers arent encouraged as they dont provide much information for future readers please provide some explanation to what you have written
– WhatsThePoint
Nov 12 '18 at 8:29
add a comment |
I can see, that all you need to do is just create 2D array with given number of rows and copy given 1D array to the to the each row. This is pretty simple:
- Create new 2D array
- Iterate over each row and put given array into it
Example:
public static int createArray(int arr, int totalRows) {
int res = new int[totalRows][arr.length];
for (int row = 0; row < totalRows; row++)
System.arraycopy(arr, 0, res[row], 0, res[row].length);
return res;
}
answered Nov 12 '18 at 7:23
oleg.cherednik
5,87821017
I can see, that all you need to do is just create 2D array with given number of rows and copy given 1D array to the to the each row. This is pretty simple:
- Create new 2D array
- Iterate over each row and put given array into it
Example:
public static int createArray(int arr, int totalRows) {
int res = new int[totalRows][arr.length];
for (int row = 0; row < totalRows; row++)
System.arraycopy(arr, 0, res[row], 0, res[row].length);
return res;
}
answered Nov 12 '18 at 7:23
oleg.cherednik
5,87821017
edited Nov 12 '18 at 8:42
answered Nov 12 '18 at 7:23
oleg.cherednik
5,87821017
answered Nov 12 '18 at 7:23
oleg.cherednik
5,87821017
answered Nov 12 '18 at 7:23
oleg.cherednik
5,87821017
5,87821017
Code only answers arent encouraged as they dont provide much information for future readers please provide some explanation to what you have written
– WhatsThePoint
Nov 12 '18 at 8:29
add a comment |
Code only answers arent encouraged as they dont provide much information for future readers please provide some explanation to what you have written
– WhatsThePoint
Nov 12 '18 at 8:29
Code only answers arent encouraged as they dont provide much information for future readers please provide some explanation to what you have written
– WhatsThePoint
Nov 12 '18 at 8:29
Code only answers arent encouraged as they dont provide much information for future readers please provide some explanation to what you have written
– WhatsThePoint
Nov 12 '18 at 8:29
add a comment |
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You are initializing only one row f[s-1][j] = x[j]; and each time a() function is called you are creating new 2D array and initializing only one row in it.
– Hrudayanath
Nov 12 '18 at 7:07
Possible duplicate of How to convert a 1d array to 2d array?
– LuCio
Nov 12 '18 at 8:42