可观察List、Set、Map

List

创建List监视属性

ObservableList<String> list = FXCollections.observableArrayList();  
for (int i = 0; i < 5; i++) {  
    list.add("item" + i);  
}  
SimpleListProperty<String> listProperty = new SimpleListProperty<>(list);

值监听

listProperty.addListener((observable, oldValue, newValue) -> {  
    // oldValue与newValue相同  
    oldValue.forEach(System.out::println);  
    System.out.println(Color.YELLOW + "--------------" + Color.RESET);  
    newValue.forEach(System.out::println);  
});

方法监听

listProperty.addListener((ListChangeListener<String>) c -> {  
    // 具体操作  
    System.out.println(c);  
    // { [item5] added at 5 }  
    // 获得元素列表  
    System.out.println("c.getList() = " + c.getList());  
    // next方法必须于判断操作类型前调用，指向下一步操作  
    System.out.println("c.next() = " + c.next());  
    // c.reset();// 撤销c.next()操作 (下面测试中不包含此行代码) 
    // 判断操作类型  
    System.out.println("c.getFrom() = " + c.getFrom());  
    System.out.println("c.getTo() = " + c.getTo());  
    System.out.println("c.wasAdded() = " + c.wasAdded());  
    System.out.println("c.wasRemoved() = " + c.wasRemoved());  
    System.out.println("c.wasReplaced() = " + c.wasReplaced());  
    /* 
    当可观察列表list中的泛型为普通数据类型时基本为false；
    当可观察列表list中的泛型为监视属性时且创建list时指定了callback回调函数,
    则如果列表中监视属性的值发生改变，则返回true
    */
    System.out.println("c.wasUpdated() = " + c.wasUpdated());
    System.out.println("c.getAddedSubList() = " + c.getAddedSubList());// 获取增加或删除的元素列表  
    try {  
        System.out.println("c.wasPermutated() = " + c.wasPermutated());// 是否被排序  
        System.out.println("c.getPermutation(0) = " + c.getPermutation(0));// 获取原来索引为0的元素经过排序后的位置（索引）  
    } catch (IllegalStateException e) {  
        System.out.println(Color.RED + "没有进行排序操作" + Color.RESET);  
    }  
    System.out.println(Color.YELLOW + "----------------------------------" + Color.RESET);  
});

添加元素list.add("item5");
{ [item5] added at 5 } c.getList() = ListProperty [value: [item0, item1, item2, item3, item4, item5]] c.next() = true c.getFrom() = 5 c.getTo() = 6 c.wasAdded() = true c.wasRemoved() = false c.wasReplaced() = false c.wasUpdated() = false c.getAddedSubList() = [item5] c.wasPermutated() = false 没有进行排序操作
追加测试list.remove("item5");
（省略上一条语句测试） { [item5] removed at 5 } c.getList() = ListProperty [value: [item0, item1, item2, item3, item4]] c.next() = true c.getFrom() = 5 c.getTo() = 5 c.wasAdded() = false c.wasRemoved() = true c.wasReplaced() = false c.wasUpdated() = false c.getAddedSubList() = [] c.wasPermutated() = false 没有进行排序操作
追加测试list.replaceAll(s -> s.replaceFirst("item1", "listItem1"));
（省略上一条语句测试） { [item0] replaced by [item0] at 0 } c.getList() = ListProperty [value: [item0, item1, item2, item3, item4]] c.next() = true c.getFrom() = 0 c.getTo() = 1 c.wasAdded() = true c.wasRemoved() = true c.wasReplaced() = true c.wasUpdated() = false c.getAddedSubList() = [item0] c.wasPermutated() = false
没有进行排序操作
{ [item1] replaced by [listItem1] at 1 } c.getList() = ListProperty [value: [item0, listItem1, item2, item3, item4]] c.next() = true c.getFrom() = 1 c.getTo() = 2 c.wasAdded() = true c.wasRemoved() = true c.wasReplaced() = true c.wasUpdated() = false c.getAddedSubList() = [listItem1] c.wasPermutated() = false
没有进行排序操作
{ [item2] replaced by [item2] at 2 } c.getList() = ListProperty [value: [item0, listItem1, item2, item3, item4]] c.next() = true c.getFrom() = 2 c.getTo() = 3 c.wasAdded() = true c.wasRemoved() = true c.wasReplaced() = true c.wasUpdated() = false c.getAddedSubList() = [item2] c.wasPermutated() = false
没有进行排序操作
{ [item3] replaced by [item3] at 3 } c.getList() = ListProperty [value: [item0, listItem1, item2, item3, item4]] c.next() = true c.getFrom() = 3 c.getTo() = 4 c.wasAdded() = true c.wasRemoved() = true c.wasReplaced() = true c.wasUpdated() = false c.getAddedSubList() = [item3] c.wasPermutated() = false
没有进行排序操作
{ [item4] replaced by [item4] at 4 } c.getList() = ListProperty [value: [item0, listItem1, item2, item3, item4]] c.next() = true c.getFrom() = 4 c.getTo() = 5 c.wasAdded() = true c.wasRemoved() = true c.wasReplaced() = true c.wasUpdated() = false c.getAddedSubList() = [item4] c.wasPermutated() = false
没有进行排序操作
追加测试list.set(3, "ListItem3");
{ [item3] replaced by [ListItem3] at 3 } c.getList() = ListProperty [value: [item0, listItem1, item2, ListItem3, item4]] c.next() = true c.getFrom() = 3 c.getTo() = 4 c.wasAdded() = true c.wasRemoved() = true c.wasReplaced() = true c.wasUpdated() = false c.getAddedSubList() = [ListItem3] c.wasPermutated() = false 没有进行排序操作
追加测试list.sort(String::compareTo);
{ permutated by [1, 4, 2, 0, 3] } c.getList() = ListProperty [value: [ListItem3, item0, item2, item4, listItem1]] c.next() = true c.getFrom() = 0 c.getTo() = 5 c.wasAdded() = falsec.wasRemoved() = false c.wasReplaced() = false c.wasUpdated() = false c.getAddedSubList() = [] c.wasPermutated() = true c.getPermutation(0) = 1

Set

创建Set监视属性

ObservableSet<String> set = FXCollections.observableSet("A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z");  
SimpleSetProperty<String> setProperty = new SimpleSetProperty<>(set);

方法监听

setProperty.addListener((SetChangeListener<String>) change -> {  
  // 与list相同，但没有next方法  
});

遍历

// iterator迭代器遍历
Iterator<String> iterator = setProperty.iterator();  
while (iterator.hasNext()) {  
    System.out.print(iterator.next());  
}  
// forEach遍历
setProperty.forEach(System.out::print);

Map

创建Map监视属性

ObservableMap<String, String> map = FXCollections.observableHashMap();  
for (int i = 0; i < 26; i++) {  
    char c = (char) ('A' + i);  
    String s = Character.toString(c);  
    map.put(s, s.toLowerCase(Locale.ROOT));  
}  
SimpleMapProperty<String, String> mapProperty = new SimpleMapProperty<>(map);

遍历

mapProperty.forEach((s, s2) -> System.out.print(s + "-" + s2 + " "));

# 可观察List、Set、Map

# List

# Set

# Map

可观察List、Set、Map

List

Set

Map