英文:
Java String Split to implement a HashMap
问题
我有一个Java字符串，如下所示，并希望根据以下方式拆分它：
String toSplit = "Apple,Fruit,10|Potato,Vegetable,15:Apple,Fruit,15|Potato,Vegetable,10|Banana,Fruit,10";
基本上，我想从字符串中创建HashMap，从类型（苹果/香蕉）到它们的数量（10/15）等。我想要一个这种类型的HashMap，直到“:”之前，以及一个从“:”之后到字符串末尾的HashMap。
我该如何拆分字符串以使我能够实现这个HashMap，并且在拆分后如何将内容插入HashMap？
基本上，字符串的第一部分（直到“:”）是我需要购买的物品列表，带有数量。字符串的第二部分是我目标的物品列表。我需要输出每个物品数量的差异。
我是Java的新手，所以任何帮助将不胜感激！谢谢！
英文:
I have a string in Java as follows, and I wanted to split it according to the following
String toSplit = "Apple,Fruit,10|Potato,Vegetable,15:Apple,Fruit,15|Potato,Vegetable,10|Banana,Fruit,10"
Basically, I wanted to have hashMaps from String to Integer, from the type (Apple/Banana) to their quantity (10/15) etc. I wanted to have one hashmap of this type until the ":" and one for after the ":" till the end of the string.
How do I go about splitting the string in a way that will allow me to implement the hashmap, and would I insert the stuff into the hashmap after splitting it?
Basically, the first part of the string (until ":") is the list of stuff I need to bought, with the quantity. And the second part of the string is the list of stuff I my target was. I need to output the difference in quantities of each.
I'm new to Java, so any help would be greatly appreciated!
Thank you!
答案1
得分: 1
以下是翻译好的代码部分：
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class Main {
public static void main(String[] args) {
String toSplit = "Apple,Fruit,10|Potato,Vegetable,15:Apple,Fruit,15|Potato,Vegetable,10|Banana,Fruit,10";
List<Map<String, Integer>> arrayList = new ArrayList<>();
// Split on :
String[] lists = toSplit.split(":");
for (String list : lists) {
// Split on |
String[] records = list.split("\\|");
Map<String, Integer> map = new HashMap<>();
for (String record : records) {
// Split on comma
String[] parts = record.split(",");
map.put(parts[0], Integer.valueOf(parts[2]));
}
arrayList.add(map);
}
System.out.println(arrayList);
}
}
输出:
[{Potato=15, Apple=10}, {Potato=10, Apple=15, Banana=10}]
英文:
First split on :, then on | and finally on , as shown below:
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class Main {
public static void main(String[] args) {
String toSplit = "Apple,Fruit,10|Potato,Vegetable,15:Apple,Fruit,15|Potato,Vegetable,10|Banana,Fruit,10";
List<Map<String, Integer>> arrayList = new ArrayList<>();
// Split on :
String[] lists = toSplit.split(":");
for (String list : lists) {
// Split on |
String[] records = list.split("\\|");
Map<String, Integer> map = new HashMap<>();
for (String record : records) {
// Split on comma
String[] parts = record.split(",");
map.put(parts[0], Integer.valueOf(parts[2]));
}
arrayList.add(map);
}
System.out.println(arrayList);
}
}
Output:
[{Potato=15, Apple=10}, {Potato=10, Apple=15, Banana=10}]
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