Lists inside lists in java
public class GuiTest {
public static void main(String[] args) {
List<List<Integer>> MainList = new ArrayList<List<Integer>>();
Random NewRandomNumber = new Random();
for (int i = 0; i < 10; i++) {
List<Integer> SecondList = new ArrayList<Integer>();
MainList.add(SecondList);
for (int i2 = 0; i2 < 10; i2++) {
SecondList.add(NewRandomNumber.nextInt(6));
}
}arraylist java methds
import java.util.ArrayList;
ArrayList<Integer> myList = new ArrayList<Integer>();
myList.add(0);
myList.remove(0);//Remove at index 0
myList.size();
myList.get(0);//Return element at index 0ArrayList
// THIS IS OKAY:
ArrayList arrayList = new ArrayList();arraylist of arraylist
public static void main(String[] args) {
ArrayList<ArrayList<Integer>> outer = new ArrayList<ArrayList<Integer>>();
ArrayList<Integer> inner = new ArrayList<Integer>();
inner.add(100);
inner.add(200);
outer.add(inner); // add first list
inner = new ArrayList<Integer>(inner); // create a new inner list that has the same content as
// the original inner list
outer.add(inner); // add second list
outer.get(0).add(300); // changes only the first inner list
System.out.println(outer);
}Copyright © 2021 Codeinu
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