我有一个使用observablelist ObservableList<Member>填充的tableview。 <{1}}对象中的一些属性是可选的，因此该行的表格单元格将为空。
我已经实现了Member和FilteredList<Member>，但是当我搜索时，由于某些单元格中的空值，会抛出SortedList<Member>。我不知道如何解决这个问题。
以下是证明我的问题的SSCCE
java.lang.NullPointerExceptionpackage com.yunusfx.javafxcustomcontrols.yunusreproduceproblem;
import javafx.application.Application;
import javafx.beans.property.ListProperty;
import javafx.beans.property.SimpleListProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.collections.transformation.FilteredList;
import javafx.collections.transformation.SortedList;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
public class TableSearch extends Application{
private TableView<Member> tv = new TableView();
private TextField tfSearch = new TextField();
ObservableList<Member> memberList = FXCollections.observableArrayList();
ListProperty<Member> memberListProperty = new SimpleListProperty<>();
public static void main(String[] args) { launch(args); }
@Override
public void start(Stage primaryStage) throws Exception {
TableColumn<Member, String> name = createNameColumn();
TableColumn<Member, Integer> age = createAgeColumn();
TableColumn<Member, String> account = createAccountColumn();
TableColumn<Member, String> location = createLocationColumn();
tfSearch.setPromptText("Search here");
tv.getColumns().addAll(name, age, account, location);
memberListProperty.set(memberList);
tv.itemsProperty().bindBidirectional(memberListProperty);
tv.setItems(memberListProperty);
setData();
FilteredList<Member> filteredData = new FilteredList<>(memberList, p -> true);
tfSearch.textProperty().addListener((observable, oldValue, newValue) -> {
filteredData.setPredicate(Member -> {
if (newValue == null || newValue.isEmpty()) {
return true;
}
String lowerCaseFilter = newValue.toLowerCase();
if (Member.getName().toLowerCase().contains(lowerCaseFilter)) {
return true;
// } else if(Member.getAge().toLowerCase().contains(lowerCaseFilter)){
// No idea how to search if is integer
// return true;
}else if(Member.getLocation().toString().toLowerCase().contains(lowerCaseFilter)){
return true;
}else if(Member.getAccount().toLowerCase().contains(lowerCaseFilter)){
return true;
}
return false;
});
});
SortedList<Member> sortedData = new SortedList<>(filteredData);
sortedData.comparatorProperty().bind(tv.comparatorProperty());
tv.setItems(sortedData);
BorderPane borderPane = new BorderPane();
borderPane.setTop(tfSearch);
borderPane.setCenter(tv);
Scene scene = new Scene(borderPane, 600, 400);
primaryStage.setScene(scene);
primaryStage.show();
}
private TableColumn createNameColumn() {
TableColumn<Member, String> colName = new TableColumn("Name");
colName.setMinWidth(25);
colName.setId("colName");
colName.setCellValueFactory(new PropertyValueFactory("name"));
return colName;
}
private TableColumn createAgeColumn() {
TableColumn<Member, Integer> colAge = new TableColumn("Age");
colAge.setMinWidth(25);
colAge.setId("colAge");
colAge.setCellValueFactory(new PropertyValueFactory("age"));
return colAge;
}
private TableColumn createAccountColumn() {
TableColumn<Member, String> colAccount = new TableColumn("Account");
colAccount.setMinWidth(25);
colAccount.setId("colAccount");
colAccount.setCellValueFactory(new PropertyValueFactory("account"));
return colAccount;
}
private TableColumn createLocationColumn() {
TableColumn<Member, String> colAccount = new TableColumn("Location");
colAccount.setMinWidth(25);
colAccount.setId("colLocation");
colAccount.setCellValueFactory(new PropertyValueFactory("location"));
return colAccount;
}
private void setData(){
Member m = new Member();
m.setAccount("we123");
m.setAge(456);
m.setLocation("Nairobi");
m.setName("Member 1");
memberList.add(m);
Member m1 = new Member();
m1.setAccount("OP5623");
m1.setAge(321);
m1.setLocation("Mombasa");
m1.setName("Doe");
memberList.add(m1);
Member m2 = new Member();
m2.setAge(569);
m2.setLocation("Meru");
m2.setName("John");
memberList.add(m2);
Member m3 = new Member();
m3.setAccount("YGTR665");
m3.setAge(666);
m3.setLocation("Eldoret");
m3.setName("Arif");
memberList.add(m3);
Member m4 = new Member();
m4.setAccount("BHJI58966");
m4.setAge(397);
m4.setName("Yunus");
memberList.add(m4);
}
public class Member {
private int id;
private String name;
private Integer age;
private String account;
private String location;
public Member(){}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public String getAccount() {
return account;
}
public void setAccount(String account) {
this.account = account;
}
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
}
}
对象中的某些属性可能未设置，因此其表格单元格将为空Member列添加为可搜索的答案 0 :(得分：0)
基于James_D的评论，我能够进行搜索工作，但首先检查可选属性的值是否为空。对于整数，将其转换为字符串然后使用字符串值。重要的是，代码只处理实际数据。
以下是我更新的内容：
FilteredList<Member> filteredData = new FilteredList<>(memberList, p -> true);
tfSearch.textProperty().addListener((observable, oldValue, newValue) -> {
filteredData.setPredicate(Member -> {
if (newValue == null || newValue.isEmpty()) {
return true;
}
String lowerCaseFilter = newValue.toLowerCase();
if (Member.getName().toLowerCase().contains(lowerCaseFilter)) {
return true;
} else if(Integer.toString(Member.getAge()).contains(lowerCaseFilter)){
return true;
}else if(Member.getLocation() != null && Member.getLocation().toLowerCase().contains(lowerCaseFilter)){
return true;
}else if(Member.getAccount() != null && Member.getAccount().toLowerCase().contains(lowerCaseFilter)){
return true;
}
return false;
});
});