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Want to convert the list of strings to map in java 8


Want to convert the list of strings to map in java 8

By : Usefulness
Date : November 19 2020, 07:01 PM
I wish this helpful for you I am having a list of strings I need to put that in Map in the form of key,value pair in java 8.can someone help me. , Split the elements of the List and collect to Map:
code :
Map<String,String> map = 
    list.stream()
        .map(s -> s.split("="))
        .collect(Collectors.toMap(a->a[0], a->a[1]));


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Convert List of Strings into Map using Java-8 Streams API

Convert List of Strings into Map using Java-8 Streams API


By : Shrinath Teke
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I have List , Here is an example on how you could do it :
code :
 Map<String, String> carsMap =
            IntStream.iterate(0, i -> i + 2).limit(cars.size() / 2)
                    .boxed()
                    .collect(Collectors.toMap(i -> cars.get(i), i -> cars.get(i + 1)));
Java convert List of key/value strings to Map

Java convert List of key/value strings to Map


By : turk
Date : March 29 2020, 07:55 AM
Hope that helps I have a List of strings which are actually keys and values: "key1", "value1", "key2", "value2", ... (every odd item is a key, every even — value). How can I convert it to Map like this "key1" -> "value1", "key2" -> "value2", ... in a beautiful way? , Here's a relatively neat way:
Java: How do I Convert List<Integers> to corresponding Strings

Java: How do I Convert List<Integers> to corresponding Strings


By : Lewis Dodson
Date : March 29 2020, 07:55 AM
may help you . An easier way to do this would be to use a HashMap and store the integer as the key and the String as the value. Something like this:
code :
HashMap<Integer, String> languages = new HashMap<>(); {{
    languages.put(4, "English");
    languages.put(11, "Bengali");
    //Etc
}}
System.out.println(languages.get(4));
//Prints "English"
for(int num: yourList) {
   System.out.println(languages.get(num));
}
Convert a list of strings to a list of maps using Java streams

Convert a list of strings to a list of maps using Java streams


By : Jan K Powell
Date : March 29 2020, 07:55 AM
Hope that helps Here is another alternative using pattern matching, not as fast as a for loop but much faster than the original stream solution in my measurements.
code :
public static void main(String[] args) {
    String test ="name=john,age=28;name=paul,age=30;name=adam,age=50";
    String patternString = "(name)=(\\w*),(age)=(\\d*)[;]?";
    Pattern pattern = Pattern.compile(patternString);
    Matcher matcher = pattern.matcher(test);
    List<Map<String, String>> list = new ArrayList<>();

    while (matcher.find()) {
        Map<String, String> map = new HashMap<>();
        map.put(matcher.group(1), matcher.group(2));
        map.put(matcher.group(3), matcher.group(4));
        list.add(map);
    }
}
How to convert List<String> of Strings to BufferedImage in Java

How to convert List<String> of Strings to BufferedImage in Java


By : Kathia_T
Date : March 29 2020, 07:55 AM
should help you out I want to convert a Base64 String array to a BufferedImage. The approach I tried to accomplish: , You can just use this:
code :
public static BufferedImage decodeToImage(List<String> imageStrings) {
    try {
        byte[] bytes = Base64.getDecoder().decode(String.join("", imageStrings));
        return ImageIO.read(new ByteArrayInputStream(bytes));
    } catch (IOException e) {
        throw new UncheckedIOException(e);
    }
}
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