1. Instant -> ZonedDateTime Example to convert a Instant UTC+0 to a Japan ZonedDateTime UTC+9 InstantZonedDateTime1.java package com.mkyong.date; import java.time.Instant; import java.time.ZoneId; import java.time.ZonedDateTime; public class InstantZ…

Java 8 examples to show you how to convert from Instant to LocalDateTime 1. Instant -> LocalDateTime The java.time.LocalDateTime has no concept of time zone, just provide a zero offset UTC+0. InstantExample1.java package com.mkyong.date; import java.…

Java 8 – Convert Map to LIST Few Java examples to convert a Map to a List Map<String, String> map = new HashMap<>(); // Convert all Map keys to a ListList<String> result = new ArrayList(map.keySet()); // Convert all Map values to a ListL…

Java 8 – Convert List to Map package com.mkyong.java8 public class Hosting { private int Id; private String name; private long websites; public Hosting(int id, String name, long websites) { Id = id; this.name = name; this.websites = websites; } //get…

Java 8 – Convert a Stream to LIST package com.mkyong.java8; import java.util.List;import java.util.stream.Collectors;import java.util.stream.Stream; public class Java8Example1 { public static void main(String[] args) { Stream<String> language = Stre…

前言 java 8的时间已经能够满足日常的使用,也方便理解.joda-time作为一个有优秀的时间组件也不得不告知使用者在java 8以后使用自带的时间 LocalDateTime以及ZonedDateTime使用 这两个时间的formate方法是返回DateTimeFormatter后的String 静态方法parse是返回对应的类型 例子如下 import lombok.extern.slf4j.Slf4j; import java.time.LocalDateTime; import ja…

在MyEclipse10中将Maven项目转成普通Java项目后,想将Java项目转成Maven项目,结果一下子傻眼了.根本就没有攻略中提到的config标签.仔细一看,喵咪的,人家用的是Eclipse,真是万恶的MyEclipse.在网上找了半天的资料后,终于找到了如何在MyEclipse中开启该功能WTP. 首先展示的是将Maven项目转成普通Java项目. 将Java项目转成Maven项目 右键项目,config-->Convert to Maven Project.热乎乎的,正好享用.…

获取 InputStream 并将其转换为String的简单方法. 添加commons-io-2.4.jar import java.io.IOException; import java.io.InputStream; import org.apache.commons.io.IOUtils; public class StringFromFile { public static void main(String[] args) throws IOException { InputStream…

int -> String 三种写法 String s = 43 + ""; String s = String.valueOf(43); String s = Integer.toString(43); 分析 String s = 43 + "";实际上进行了如下操作:a)初始化一个StringBuilder; b)append一个43; c)append一个空字符串; d)将此sb toString() String s = String.valueOf(…

参考 Java 8 Date and Time API is one of the most sought after change for developers. Java has been missing a consistent approach for Date and Time from start and Date Time API is a welcome addition to the core Java APIs. Why do we need new Java Date Ti…