小编Fra*_*kyi的帖子

我正在使用a GridPane来存储关于城市的信息(在游戏中),但有时我想删除一些行.这是我用于我的课程GridPane:

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import com.franckyi.kingsim.city.City;

import javafx.scene.Node;
import javafx.scene.control.Button;
import javafx.scene.control.CheckBox;
import javafx.scene.layout.GridPane;
import javafx.scene.text.Text;

public class CityGrid extends GridPane {

    private List<City> cities;

    public CityGrid() {
        super();
        cities = new ArrayList<City>();
    }

    public List<City> getCities() {
        return cities;
    }

    public void deleteCity(int row) {
        cities.remove(row - 1);
        removeNodes(getNodesFromRow(row));
        int i = row;
        while (!getNodesFromRow(i + 1).isEmpty()) {
            moveNodes(i + 1, getNodesFromRow(i + 1));
            removeNodes(getNodesFromRow(i + 1));
            i++;
        }
    }

    public void …

好吧,标题可能很难理解.我找不到正确的东西.所以,基本上我使用Java 8函数来创建可重试的API.我想要一个简单的接口实现,所以我在of(...)Retryable接口的每个实现中创建了一个方法,我们可以使用lambda表达式,而不是手动创建一个匿名类.

import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Supplier;

public interface Retryable<T, R> extends Function<T, R>{

    void retrying(Exception e);

    void skipping(Exception e);

    int trials();

    @Override
    default R apply(T t) {
        int trial = 0;
        while (true) {
            trial++;
            try {
                return action(t);
            } catch (Exception e) {
                if (trial < trials()) {
                    retrying(e);
                } else {
                    skipping(e);
                    return null;
                }
            }
        }
    }

    R action(T input) throws Exception;

    interface RunnableRetryable extends Retryable<Void, Void> {

        static RunnableRetryable of(Consumer<Exception> retrying, Consumer<Exception> …

updateProgress(workDone, max)我的程序使用 JavaFX 中的任务来下载和解压缩文件，并通过使用方法和方法在屏幕上显示进度progressProperty().bind(observable)。它适用于下载：

package com.franckyi.lan.installer;

import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;
import java.nio.file.Files;
import java.nio.file.Paths;

import javafx.concurrent.Task;

public class DownloadTask extends Task<Void> {

    private String file;
    private String url;

    public DownloadTask(String dir, String fileurl) {
        file = dir;
        url = fileurl;
    }

    @Override
    protected Void call() throws Exception {
        URLConnection connection = new URL(url).openConnection();
        long fileLength = connection.getContentLengthLong();

        try (InputStream is = connection.getInputStream();
                OutputStream os = Files.newOutputStream(Paths.get(file))) {

            long nread = 0L;
            byte[] buf …