Java实验九第一题

不废话，直接上代码~

package 集合与映射表;

import java.util.TreeSet;
import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.FlowPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;

/**
 * 首先移除最大的球
 * @author AngoLi
 */
public class Exercise20_09 extends Application{
    @Override
    public void start(Stage stage){
        TreeSet<Double> ts = new TreeSet<>();
        
        FlowPane fp = new FlowPane();
        BorderPane bp = new BorderPane();
        Button bt = new Button("—");
        
        Circle[] circle = new Circle[20];
        
        for(int i = 0; i < circle.length; i++){
            circle[i] = new Circle(Math.random()*18+2);
            circle[i].setFill(Color.CORAL); 
            ts.add(circle[i].getRadius());
            fp.getChildren().add(circle[i]);
        }
        
        bp.setCenter(fp);
        bp.setBottom(bt); 
        
        Scene scene = new Scene(bp, 500,300);
        
        stage.setTitle("Exercise20_09");
        stage.setScene(scene);
        stage.show();
        
        bt.setOnMouseClicked(e->{
            // ts.last()
            for(int j = 0; j < circle.length; j++){
                if(circle[j].getRadius()==ts.last()){
                    fp.getChildren().remove(circle[j]);
                }
            }  
        });   
    }
    public static void main(String[] args){
        Application.launch(args); 
    }
}