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Iterate List<List<Integer>> in java

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Nirmana Dasunpriya answered on September 4, 2020 Popularity 8/10 Helpfulness 2/10

answer Iterate List<List<Integer>> in java

related How to iterate over a list in Java?

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Iterate List<List<Integer>> in java

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List<List<Int>> arrayList = new ArrayList(); //Java usually infers type parameters in cases as these
for(int i = 0; i < desiredSize; i++){
    List<Int> listAtI = new ArrayList ();
    for(int j = 0; j < rowLength; j++){
        listAtI.set(j, 0);  //sets the element at j to be  0, notice the values are Int not int, this is dues to Javas generics having to work with classes not simple types, the values are (mostly) automatically boxed/unboxed
    }
    arrayList.set(i, listAtI);
}

arrayList.get(5); //returns the list at index 5
arrayList.get(5).get(5) // returns values from column 5 in row 5

Popularity 8/10 Helpfulness 2/10 Language java

Source: Grepper

Tags: iterate java

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Contributed on Aug 30 2022

Nirmana Dasunpriya

0 Answers Avg Quality 2/10

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How to iterate over a list in Java?

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// Use for/while loop to iterate a List and get element by index.
for(int i= 0; i < list.size(); i++) {
   System.out.println(list.get(i));
}
//Use foreach loop to iterate list of elements. 
for(int i= 0; i < list.size(); i++) {
   System.out.println(list.get(i));
}
//Use iterator from the list to iterate through its elements.
Iterator<Integer> iterator = list.iterator();
while(iterator.hasNext()) {
   System.out.print(iterator.next() + " ");
}
// Use listIterator from the list to iterate through its elements.
Iterator<Integer> iterator = list.listIterator();
while(iterator.hasNext()) {
   System.out.print(iterator.next() + " ");
}
// Use forEach of the list to iterate through its elements.
list.forEach(i -> {System.out.print(i + " ");});
//Use forEach of the stream of list to iterate through its elements.
list.stream().forEach(i -> {System.out.print(i + " ");});

Popularity 10/10 Helpfulness 7/10 Language java

Source: www.tutorialspoint.com

Tags: iterate

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Contributed on Jun 15 2022

Rasel Ahmed

0 Answers Avg Quality 2/10

iterate list in java

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Iterator itr=list.iterator();
while(itr.hasNext)
{
 system.out.println(itr.next); 
}

Popularity 10/10 Helpfulness 3/10 Language java

Source: Grepper

Tags: iterate

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Contributed on Sep 04 2020

Muddy Mongoose

0 Answers Avg Quality 2/10

Iterate List<List<Integer>> in java

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Iterate List<List<Integer>> in java

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How to iterate over a list in Java?

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