How to convert object to list with keys

Question

I have a list in the following format

[{name=test1, id=something, row=1},
{name=test3, id=something, row=3},
{name=test2, id=something, row=2},
{name=test4, id=something, row=4}]

How can I find values according its keys, e.g. I need name from row 3... and also how can I sort it according row

Answer 1

Since your example is no valid json I assume that this should just represent the strucutre of the objects. So for a list with object of this class

public class NamedRow {
    private String name;
    private String id;
    private int row;

    public int getRow() {
        return row;
    }

    // Other getters + setters
}

You can solve this with java streams:

• Assuming the value of row is unique:

// return null if not found
public static NamedRow findSingle(List<NamedRow> list, int row){
        return list.stream()
                .filter(namedRow -> namedRow.getRow() == row)
                .findAny()
                .orElse(null);
    }

• Assuming the value of row is not unique:

// returns empty list if no entry matches
public static List<NamedRow> findMultiple(List<NamedRow> list, int row){
        return list.stream()
                .filter(namedRow -> namedRow.getRow() == row)
                .collect(Collectors.toList());
    }