英文:
How to using Java 8 Streams to iterate over key values?
问题
String products = UtlityToReadValueFromProperties.get("financialProducts");
List<String> list = Arrays.asList(products.split(","));
String result = list.stream()
.map(item -> UtlityToReadValueFromProperties.get(item))
.filter(value -> value.contains("OPM"))
.findFirst()
.orElse("EQUITY");
这段代码会从 properties 文件中读取 financialProducts 的值，然后将其拆分为列表。接下来，它会迭代这个列表，对每个值调用 UtlityToReadValueFromProperties.get(item) 来获取对应的值。然后，它会使用 filter 来查找包含 "OPM" 的值，如果找到，就返回该值，否则返回 "EQUITY"。
英文:
I want to write a program for below pseudocode using java 8 streams
read an entry from a properties file
if value contains "input" return the field
I have a utility that reads from the properties file.
financialProducts=FX,EQUITY
FX=ABC,LMN,XYZ
EQUITY=OPM,PWZ,TYU
if I have to read financialProducts and iterate through FX, EQUITY
when iterating though values of FX, if values contain PWZ, I must return FX else iterate through EQUITY and look for value PWZ in it.
This is what I have so far
String products = UtlityToReadValueFromProperties.get("financialProducts");
List<String> list = Arrays.asList<names.split(",");
String result = list.stream().map(item -> UtlityToReadValueFromProperties .get(item)).filter(value -> values.contains("OPM").toString();
// This return OPM,PWZ,TYU, however, I want the code to return EQUITY
答案1
得分: 1
尝试使用这个流：
String result = list.stream().filter(item -> UtlityToReadValueFromProperties.get(item).constains("OPM")).toString();
首先，您正在使用列表创建一个流，然后我们按如下方式过滤值，对于每个项：
> 1) 我们使用UtlityToReadValueFromProperties.get获取属性的值。
> 2) 我们检查给定的值，
> 在这里是"OPM"，是否存在于所选属性的值之间。
> 3) 如果"OPM"存在于属性值中，则该项名称将与过滤结果列表一起返回。
英文:
Try with this stream instead:
String result = list.stream().filter(item -> UtlityToReadValueFromProperties.get(item).constains("OPM")).toString();
First, you are creating a stream using your list, then we filter throw the values as follows, for each item:
> 1) We get the value of the property using
> UtlityToReadValueFromProperties.get.
> 2) We check if the given value,
> here "OPM", exists between the values of the selected property.
> 3) If the "OPM" exists in the property values, it item name will be returned with the list of filter results.
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