'Java How to know if arraylist contains value in property of object [duplicate]

I want to find if the property numb in the ArrayList grids contains a certain value or not. Then I want to get the index of the entry that contains that value.

public class Grid {
  public int numb;

  public GridSeg(int numb) {
    this.numb = numb;
  }
}

public ArrayList<Grid> grids = new ArrayList<Grid>();

for (int i = 0; i < 6; i++) {
  Grid grid = new Grid(i);
  grids.add(grid);
}

/pseudo code since I don't know how it is done
if (grids.numb.contains(12)) {
  if (grid.numb == 12) //get grid index
}
javaarraylistlibgdx


Solution 1:[1]

You can achieve it with streams

    ArrayList<Grid> grids = new ArrayList<>();
    Grid grid = grids.stream().filter(l -> l.numb == 12).findFirst().orElse(null);
    int index = grids.indexOf(grid);

Sources

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Source: Stack Overflow

Solution Source
Solution 1 zfChaos

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