ComboBox实现模糊搜索

实体类

class Student {  
    private String name;  
    private double score;  
    private String subject;  

    public Student(String name, double score, String subject) {  
        this.name = name;  
        this.score = score;  
        this.subject = subject;  
    }  

    public Student() {  
    }  

    public String getName() {  
        return name;  
    }  

    public void setName(String name) {  
        this.name = name;  
    }  

    public double getScore() {  
        return score;  
    }  

    public void setScore(double score) {  
        this.score = score;  
    }  

    public String getSubject() {  
        return subject;  
    }  

    public void setSubject(String subject) {  
        this.subject = subject;  
    }  

    @Override  
    public boolean equals(Object o) {  
        if (this == o) return true;  
        if (o == null || getClass() != o.getClass()) return false;  
        Student student = (Student) o;  
        return Double.compare(student.score, score) == 0 && Objects.equals(name, student.name) && Objects.equals(subject, student.subject);  
    }  

    @Override  
    public int hashCode() {  
        return Objects.hash(name, score, subject);  
    }  
}

初始化下拉列表和填充数据

Student student1 = new Student("张三", 78, "语文");  
Student student2 = new Student("李四", 69, "数学");  
Student student3 = new Student("王五", 70, "英语");  
Student student4 = new Student("赵六", 49, "物理");  
Student student5 = new Student("钱七", 80, "化学");  
Student student6 = new Student("孙八", 99, "生物");  
Student student7 = new Student("周九", 59, "政治");  
Student student8 = new Student("吴十", 10, "历史");  
Student student9 = new Student("郑十一", 20, "地理");  
Student student10 = new Student("王十二", 30, "技术");  
ComboBox<Student> comboBox = new ComboBox<>();  
comboBox.getItems().addAll(student1, student2, student3, student4, student5, student6, student7, student8, student9, student10);

其他设置

// 设置可编辑（相较于ChoiceBox的特点）  
comboBox.setEditable(true);
// 设置占位符
comboBox.setPlaceholder(new Label("无学生"));

保存原数据

ObservableList<Student> originalItems = comboBox.getItems();

数据展示处理

comboBox.setConverter(new StringConverter<Student>() {  
    @Override  
    public String toString(Student object) {  
        if (object == null) {  
            return "";  
        }  
        String value = object.getName() + ":" + object.getScore() + ":" + object.getSubject();  
        return value;  
    }  
    // 在输入框中输入文本按下回车键时，调用此方法  
    @Override  
    public Student fromString(String string) {  
        return null;  
    }  
});

获取单行文本框的文本监听

comboBox.editorProperty().get().textProperty().addListener((observable, oldValue, newValue) -> {  
    if (newValue == null || newValue.isEmpty()|| originalItems.contains(comboBox.getValue())) {  
        comboBox.setItems(originalItems);  
        comboBox.setPlaceholder(new Label("无学生"));  
        return;  
    }  
    // 取出符合条件的学生装进列表
    FilteredList<Student> newList = originalItems.filtered(student -> student.getName().contains(newValue));  
    if (newList.isEmpty()) {  
        comboBox.setItems(null);  
        comboBox.setPlaceholder(new Label("无学生"));  
    } else {  
        comboBox.setItems(newList);  
        comboBox.hide();  
        comboBox.show();  
    }  
});

添加控件到布局中，调整位置，添加布局到场景，添加场景到舞台，调整舞台设置（省略）

# ComboBox实现模糊搜索

ComboBox实现模糊搜索