Wednesday, 4 April 2018

How to sort Object class custom property in java ?

public static void main(String[] args) {
        List<Object> list = new ArrayList();
        list.add(new Object[]{new Object[]{"code", "123.456"}, new Object[]{"size", 200},new Object[]{"location", "Indonesia"}});
        list.add(new Object[]{new Object[]{"code", "321.987"}, new Object[]{"size", 250},new Object[]{"location", "Indonesia"}});
        list.add(new Object[]{new Object[]{"code", "456.987"}, new Object[]{"size", 220},new Object[]{"location", "Thailand"}});
        list.add(new Object[]{new Object[]{"code", "147.258"}, new Object[]{"size", 320},new Object[]{"location", "Thailand"}});

        list.add(new Object[]{new Object[]{"code", "852.741"},new Object[]{"size", 80},new Object[]{"location", "Malaysia"}});
        list.add(new Object[]{new Object[]{"code", "456.789"}, new Object[]{"size", 320},new Object[]{"location", "Indonesia"}});
        list.add(new Object[]{new Object[]{"code", "654.321"}, new Object[]{"size", 300},new Object[]{"location", "Indonesia"}});
        System.out.println("BEFORE SORTING:");
        for (Object obj : list) {
            System.out.println("Location:" + (((Object[]) ((Object[]) obj)[2]))[1] + ",Size=" + (((Object[]) ((Object[]) obj)[1]))[1]
                    + ",Code" + (((Object[]) ((Object[]) obj)[0]))[1]);
        }
        Collections.sort(list, new MyComp());
        System.out.println("AFTER SORTING:");
        for (Object obj : list) {
            System.out.println("Location:" + (((Object[]) ((Object[]) obj)[2]))[1] + ",Size=" + (((Object[]) ((Object[]) obj)[1]))[1]
                    + ",Code" + (((Object[]) ((Object[]) obj)[0]))[1]);
        }
    }

    static class MyComp implements Comparator {

        @Override
        public int compare(Object o1, Object o2) {
            if (o1 instanceof Object[] && o2 instanceof Object[]) {
                if (((Object[]) o1).length == 3 && ((Object[]) o2).length == 3) {
                    return ((String) (((Object[]) ((Object[]) o1)[2]))[1]).compareTo((String) (((Object[]) ((Object[]) o2)[2]))[1]);
                } else {
                    return 0;
                }
            } else {
                return 0;
            }
        }
    }