(Java) add list of lists to ArrayList<List>

-2

I have a list of integer lists that I have initialized.

ArrayList<List<Integer>> list = new ArrayList();

I also have some data that I need to append to this list.

list = [[1,5,9], [3,5,7], [1,4,7],[2,5,8],[3,6,9], [1,2,3], [4,5,6],[7,8,9]];

EDIT:

I understand that this is not a legal way to express a list of lists in java (python background) but I do not know how to do so in Java.

What would be the best way to append this data to a list of lists in Java?

edited Oct 19 '18 at 19:22

Mureinik

182k22133200

asked Oct 19 '18 at 18:58

entercaspa

335114

How is that data represented?

– Mureinik
Oct 19 '18 at 19:00

1

right now just like the list variable above, I come from a python background so the list of lists is there, i dont know how to express it in java

– entercaspa
Oct 19 '18 at 19:01

add a comment |

-2

I have a list of integer lists that I have initialized.

ArrayList<List<Integer>> list = new ArrayList();

I also have some data that I need to append to this list.

list = [[1,5,9], [3,5,7], [1,4,7],[2,5,8],[3,6,9], [1,2,3], [4,5,6],[7,8,9]];

EDIT:

I understand that this is not a legal way to express a list of lists in java (python background) but I do not know how to do so in Java.

What would be the best way to append this data to a list of lists in Java?

edited Oct 19 '18 at 19:22

Mureinik

182k22133200

asked Oct 19 '18 at 18:58

entercaspa

335114

How is that data represented?

– Mureinik
Oct 19 '18 at 19:00

1

right now just like the list variable above, I come from a python background so the list of lists is there, i dont know how to express it in java

– entercaspa
Oct 19 '18 at 19:01

add a comment |

-2

I have a list of integer lists that I have initialized.

ArrayList<List<Integer>> list = new ArrayList();

I also have some data that I need to append to this list.

list = [[1,5,9], [3,5,7], [1,4,7],[2,5,8],[3,6,9], [1,2,3], [4,5,6],[7,8,9]];

EDIT:

I understand that this is not a legal way to express a list of lists in java (python background) but I do not know how to do so in Java.

What would be the best way to append this data to a list of lists in Java?

edited Oct 19 '18 at 19:22

Mureinik

182k22133200

asked Oct 19 '18 at 18:58

entercaspa

335114

I have a list of integer lists that I have initialized.

ArrayList<List<Integer>> list = new ArrayList();

I also have some data that I need to append to this list.

list = [[1,5,9], [3,5,7], [1,4,7],[2,5,8],[3,6,9], [1,2,3], [4,5,6],[7,8,9]];

EDIT:

I understand that this is not a legal way to express a list of lists in java (python background) but I do not know how to do so in Java.

What would be the best way to append this data to a list of lists in Java?

java list arraylist

edited Oct 19 '18 at 19:22

Mureinik

182k22133200

asked Oct 19 '18 at 18:58

entercaspa

335114

edited Oct 19 '18 at 19:22

Mureinik

182k22133200

asked Oct 19 '18 at 18:58

entercaspa

335114

edited Oct 19 '18 at 19:22

Mureinik

182k22133200

edited Oct 19 '18 at 19:22

Mureinik

182k22133200

edited Oct 19 '18 at 19:22

Mureinik

182k22133200

asked Oct 19 '18 at 18:58

entercaspa

335114

asked Oct 19 '18 at 18:58

entercaspa

335114

asked Oct 19 '18 at 18:58

entercaspa

335114

How is that data represented?

– Mureinik
Oct 19 '18 at 19:00

1

right now just like the list variable above, I come from a python background so the list of lists is there, i dont know how to express it in java

– entercaspa
Oct 19 '18 at 19:01

add a comment |

How is that data represented?

– Mureinik
Oct 19 '18 at 19:00

1

right now just like the list variable above, I come from a python background so the list of lists is there, i dont know how to express it in java

– entercaspa
Oct 19 '18 at 19:01

How is that data represented?

– Mureinik
Oct 19 '18 at 19:00

right now just like the list variable above, I come from a python background so the list of lists is there, i dont know how to express it in java

– entercaspa
Oct 19 '18 at 19:01

add a comment |

3 Answers
3

active

oldest

votes

You could do it like this

List<List<Integer>> lists = Arrays.asList(

    Arrays.asList(1,5,9),

    Arrays.asList(3,5,7),

    Arrays.asList(1,4,7),

    Arrays.asList(2,5,8),

    Arrays.asList(3,6,9),

    Arrays.asList(1,2,3),

    Arrays.asList(4,5,6),

    Arrays.asList(7,8,9)

);

if it is okay that the lists can’t change their size once they’ve been created.

edited Nov 25 '18 at 16:42

answered Oct 19 '18 at 19:03

Antimon

1197

add a comment |

The easiest approach would probably be to use Arrays#asList:

List<List<Integer>> list = 

    Arrays.asList(Arrays.asList(1, 5, 9),

                  Arrays.asList(3, 5, 7),

                  /* etc... */

                 );

EDIT:

If you're using Java 9 or above, you could also use the slightly more elegant List#of:

List<List<Integer>> list = 

    List.of(List.of(1, 5, 9),

            List.of(3, 5, 7),

            /* etc... */

           );

edited Oct 19 '18 at 19:10

answered Oct 19 '18 at 19:04

Mureinik

182k22133200

add a comment |

Using java-8 :

List<List<Integer>> lists  = Stream

            .of(Arrays.asList(1, 5, 9), Arrays.asList(3, 5, 7), Arrays.asList(1, 4, 7), 

                Arrays.asList(2, 5, 8), Arrays.asList(3, 6, 9), Arrays.asList(1, 2, 3), 

                Arrays.asList(4, 5, 6), Arrays.asList(7, 8, 9))

            .collect(Collectors.toList());

edited Oct 21 '18 at 6:37

answered Oct 20 '18 at 6:05

Nicholas K

6,76761133

add a comment |

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3 Answers
3

active

oldest

votes

3 Answers
3

active

oldest

votes

You could do it like this

List<List<Integer>> lists = Arrays.asList(

    Arrays.asList(1,5,9),

    Arrays.asList(3,5,7),

    Arrays.asList(1,4,7),

    Arrays.asList(2,5,8),

    Arrays.asList(3,6,9),

    Arrays.asList(1,2,3),

    Arrays.asList(4,5,6),

    Arrays.asList(7,8,9)

);

if it is okay that the lists can’t change their size once they’ve been created.

edited Nov 25 '18 at 16:42

answered Oct 19 '18 at 19:03

Antimon

1197

add a comment |

You could do it like this

List<List<Integer>> lists = Arrays.asList(

    Arrays.asList(1,5,9),

    Arrays.asList(3,5,7),

    Arrays.asList(1,4,7),

    Arrays.asList(2,5,8),

    Arrays.asList(3,6,9),

    Arrays.asList(1,2,3),

    Arrays.asList(4,5,6),

    Arrays.asList(7,8,9)

);

if it is okay that the lists can’t change their size once they’ve been created.

edited Nov 25 '18 at 16:42

answered Oct 19 '18 at 19:03

Antimon

1197

add a comment |

You could do it like this

List<List<Integer>> lists = Arrays.asList(

    Arrays.asList(1,5,9),

    Arrays.asList(3,5,7),

    Arrays.asList(1,4,7),

    Arrays.asList(2,5,8),

    Arrays.asList(3,6,9),

    Arrays.asList(1,2,3),

    Arrays.asList(4,5,6),

    Arrays.asList(7,8,9)

);

if it is okay that the lists can’t change their size once they’ve been created.

edited Nov 25 '18 at 16:42

answered Oct 19 '18 at 19:03

Antimon

1197

You could do it like this

List<List<Integer>> lists = Arrays.asList(

    Arrays.asList(1,5,9),

    Arrays.asList(3,5,7),

    Arrays.asList(1,4,7),

    Arrays.asList(2,5,8),

    Arrays.asList(3,6,9),

    Arrays.asList(1,2,3),

    Arrays.asList(4,5,6),

    Arrays.asList(7,8,9)

);

if it is okay that the lists can’t change their size once they’ve been created.

edited Nov 25 '18 at 16:42

answered Oct 19 '18 at 19:03

Antimon

1197

edited Nov 25 '18 at 16:42

answered Oct 19 '18 at 19:03

Antimon

1197

answered Oct 19 '18 at 19:03

Antimon

1197

answered Oct 19 '18 at 19:03

Antimon

1197

add a comment |

The easiest approach would probably be to use Arrays#asList:

List<List<Integer>> list = 

    Arrays.asList(Arrays.asList(1, 5, 9),

                  Arrays.asList(3, 5, 7),

                  /* etc... */

                 );

EDIT:

If you're using Java 9 or above, you could also use the slightly more elegant List#of:

List<List<Integer>> list = 

    List.of(List.of(1, 5, 9),

            List.of(3, 5, 7),

            /* etc... */

           );

edited Oct 19 '18 at 19:10

answered Oct 19 '18 at 19:04

Mureinik

182k22133200

add a comment |

The easiest approach would probably be to use Arrays#asList:

List<List<Integer>> list = 

    Arrays.asList(Arrays.asList(1, 5, 9),

                  Arrays.asList(3, 5, 7),

                  /* etc... */

                 );

EDIT:

If you're using Java 9 or above, you could also use the slightly more elegant List#of:

List<List<Integer>> list = 

    List.of(List.of(1, 5, 9),

            List.of(3, 5, 7),

            /* etc... */

           );

edited Oct 19 '18 at 19:10

answered Oct 19 '18 at 19:04

Mureinik

182k22133200

add a comment |

The easiest approach would probably be to use Arrays#asList:

List<List<Integer>> list = 

    Arrays.asList(Arrays.asList(1, 5, 9),

                  Arrays.asList(3, 5, 7),

                  /* etc... */

                 );

EDIT:

If you're using Java 9 or above, you could also use the slightly more elegant List#of:

List<List<Integer>> list = 

    List.of(List.of(1, 5, 9),

            List.of(3, 5, 7),

            /* etc... */

           );

edited Oct 19 '18 at 19:10

answered Oct 19 '18 at 19:04

Mureinik

182k22133200

The easiest approach would probably be to use Arrays#asList:

List<List<Integer>> list = 

    Arrays.asList(Arrays.asList(1, 5, 9),

                  Arrays.asList(3, 5, 7),

                  /* etc... */

                 );

EDIT:

If you're using Java 9 or above, you could also use the slightly more elegant List#of:

List<List<Integer>> list = 

    List.of(List.of(1, 5, 9),

            List.of(3, 5, 7),

            /* etc... */

           );

edited Oct 19 '18 at 19:10

answered Oct 19 '18 at 19:04

Mureinik

182k22133200

edited Oct 19 '18 at 19:10

answered Oct 19 '18 at 19:04

Mureinik

182k22133200

answered Oct 19 '18 at 19:04

Mureinik

182k22133200

answered Oct 19 '18 at 19:04

Mureinik

182k22133200

add a comment |

Using java-8 :

List<List<Integer>> lists  = Stream

            .of(Arrays.asList(1, 5, 9), Arrays.asList(3, 5, 7), Arrays.asList(1, 4, 7), 

                Arrays.asList(2, 5, 8), Arrays.asList(3, 6, 9), Arrays.asList(1, 2, 3), 

                Arrays.asList(4, 5, 6), Arrays.asList(7, 8, 9))

            .collect(Collectors.toList());

edited Oct 21 '18 at 6:37

answered Oct 20 '18 at 6:05

Nicholas K

6,76761133

add a comment |

Using java-8 :

List<List<Integer>> lists  = Stream

            .of(Arrays.asList(1, 5, 9), Arrays.asList(3, 5, 7), Arrays.asList(1, 4, 7), 

                Arrays.asList(2, 5, 8), Arrays.asList(3, 6, 9), Arrays.asList(1, 2, 3), 

                Arrays.asList(4, 5, 6), Arrays.asList(7, 8, 9))

            .collect(Collectors.toList());

edited Oct 21 '18 at 6:37

answered Oct 20 '18 at 6:05

Nicholas K

6,76761133

add a comment |

Using java-8 :

List<List<Integer>> lists  = Stream

            .of(Arrays.asList(1, 5, 9), Arrays.asList(3, 5, 7), Arrays.asList(1, 4, 7), 

                Arrays.asList(2, 5, 8), Arrays.asList(3, 6, 9), Arrays.asList(1, 2, 3), 

                Arrays.asList(4, 5, 6), Arrays.asList(7, 8, 9))

            .collect(Collectors.toList());

edited Oct 21 '18 at 6:37

answered Oct 20 '18 at 6:05

Nicholas K

6,76761133

Using java-8 :

List<List<Integer>> lists  = Stream

            .of(Arrays.asList(1, 5, 9), Arrays.asList(3, 5, 7), Arrays.asList(1, 4, 7), 

                Arrays.asList(2, 5, 8), Arrays.asList(3, 6, 9), Arrays.asList(1, 2, 3), 

                Arrays.asList(4, 5, 6), Arrays.asList(7, 8, 9))

            .collect(Collectors.toList());

edited Oct 21 '18 at 6:37

answered Oct 20 '18 at 6:05

Nicholas K

6,76761133

edited Oct 21 '18 at 6:37

answered Oct 20 '18 at 6:05

Nicholas K

6,76761133

answered Oct 20 '18 at 6:05

Nicholas K

6,76761133

answered Oct 20 '18 at 6:05

Nicholas K

6,76761133

add a comment |

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