java - 对象的Arraylist查找所有不同属性的对象

Question

我有对象(元素)的数组列表，需要查找具有不同样式的所有元素:

ArrayList<Element> = new ArrayList<Element>();

class Element {
    String text;
    Style style;

    public Element() {}
}

class Style {
    String background;
    Integer size;

    public Style() {}
}

Answer 1

ArrayList<Element> list = new ArrayList<>();
        // define elements:
        Element e1 = new Element();
        e1.setText("1. Element");
        e1.setStyle(new Style("#343434", 100));

        Element e2 = new Element();
        e2.setText("2. Element");
        e2.setStyle(new Style("#343411", 100));

        Element e3 = new Element();
        e3.setText("3. Element");
        e3.setStyle(new Style("#343434", 101));

        Element e4 = new Element();
        e4.setText("4. Element");
        e4.setStyle(new Style("#343434", 100));
        // add elements to list:
        list.add(e1);
        list.add(e2);
        list.add(e3);
        list.add(e4);
        // define standard stayl and size
        String backgroundStandard = "#343434";
        Integer sizeStandard = 100;
        // check elements
        for(int i=0; i<list.size(); i++){
            if(!list.get(i).getStyle().getBackground().equals(backgroundStandard)){
                System.out.println(list.get(i).getText() + " has a different background!");
            }
            if(list.get(i).getStyle().getSize() != sizeStandard){
                System.out.println(list.get(i).getText() + " has a different size!");
            }
        }


class Element {
        String text;
        Style style;

        public Element() {}

        public String getText() {
            return text;
        }

        public void setText(String text) {
            this.text = text;
        }

        public Style getStyle() {
            return style;
        }

        public void setStyle(Style style) {
            this.style = style;
        }


    }

class Style {
        String background;
        Integer size;

        public Style(String background, Integer size) {
            this.background = background;
            this.size = size;
        }

        public String getBackground() {
            return background;
        }

        public void setBackground(String background) {
            this.background = background;
        }

        public Integer getSize() {
            return size;
        }

        public void setSize(Integer size) {
            this.size = size;
        }       

    }