JavaFX学习之样例9
该代码说明table的ColumnResizePolicy作用

import javafx.application.Application;import javafx.beans.property.SimpleStringProperty;import javafx.collections.FXCollections;import javafx.collections.ObservableList;import javafx.scene.Scene;import javafx.scene.control.Label;import javafx.scene.control.LabelBuilder;import javafx.scene.control.TableColumn;import javafx.scene.control.TableView;import javafx.scene.control.cell.PropertyValueFactory;import javafx.scene.layout.VBox;import javafx.stage.Stage;public class TableViewColumnResizePolicyDemo extends Application {public static void main(String[] args) {Application.launch(args);}@Overridepublic void start(Stage stage) throws Exception {VBox root = new VBox();root.autosize();Scene scene = new Scene(root);stage.setTitle("TableView Column Resize Policy Demo");stage.setWidth(700);    stage.setHeight(400);    stage.setScene(scene);    stage.show();    configureTable(root);}private void configureTable(VBox root) {final ObservableList<MyDomain> data = FXCollections.observableArrayList( new MyDomain("Apple","This is a fruit.","Red"), new MyDomain("Orange","This is also a fruit.","Orange"), new MyDomain("Potato","This is a vegetable.","Brown") );TableView<MyDomain> table1 = getTableView(data);table1.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY); //column随着table增大而增大TableView<MyDomain> table2 = getTableView(data);table2.setColumnResizePolicy(TableView.UNCONSTRAINED_RESIZE_POLICY); //column不会变化，仍是固定大小，会用额外空的column填充root.setSpacing(15);root.getChildren().addAll(LabelBuilder.create().text("CONSTRAINED_RESIZE_POLICY").style("-fx-font-weight:bold;").build(),table1,  LabelBuilder.create().text("UNCONSTRAINED_RESIZE_POLICY").style("-fx-font-weight:bold;").build(),table2);}private TableView<MyDomain> getTableView(ObservableList<MyDomain> data){TableView<MyDomain> table = new TableView<MyDomain>();TableColumn<MyDomain,String> titleColumn = new TableColumn<MyDomain,String>("Title");titleColumn.setPrefWidth(100);titleColumn.setCellValueFactory(new PropertyValueFactory<MyDomain,String>("name"));TableColumn<MyDomain,String> descCol = new TableColumn<MyDomain,String>("Description");descCol.setPrefWidth(250);descCol.setCellValueFactory(new PropertyValueFactory<MyDomain,String>("description"));TableColumn<MyDomain,String> colorCol = new TableColumn<MyDomain,String>("Color");colorCol.setPrefWidth(100);colorCol.setCellValueFactory(new PropertyValueFactory<MyDomain,String>("color"));table.getColumns().addAll(titleColumn,descCol,colorCol);table.setItems(data);return table;}/** * Domain Object. */public class MyDomain{private SimpleStringProperty name = new SimpleStringProperty();private SimpleStringProperty description = new SimpleStringProperty();private SimpleStringProperty color = new SimpleStringProperty();public MyDomain(String name, String desc,String color){this.name.set(name);this.description.set(desc);this.color.set(color);}public String getDescription() {        return description.get();    }     public SimpleStringProperty descriptionProperty(){    return description;    }    public String getName() {        return name.get();    }    public SimpleStringProperty nameProperty(){    return name;    }    public String getColor() {        return color.get();    }    public SimpleStringProperty colorProperty(){    return color;    }}}

从显示的效果看来，ColumnResizePolicy是控制column的大小是否自动增长。设置TableView.CONSTRAINED_RESIZE_POLICY，则table的colum大小随table的大小便化而变化。若设置TableView.UNCONSTRAINED_RESIZE_POLICY，table的column大小固定，则会多出一个空白的column以填充table的大小