Convert string to list of objects using Java 8

Question

I have a line

"Red apple, blue banana, orange".

How can I divide it into "," and then add "_" between two words (for example, Red_apple, but not orange) and the capital letters of all letters. I read a few posts and found a solution, but it only has a split part, and how can I add "_" and use all the letters?

   Pattern pattern = Pattern.compile(", ");
   List<Fruit> f = pattern.splitAsStream(fruitString)
  .map(Fruit::valueOf)
  .collect(Collectors.toList());

Fruit is an enumeration object. So basically, if I can convert the string to a specific format, and I can get an Enum object based on the name Enum.

Answer 1

map(...) String. Fruit::valueOf , map(...) , :

List<Fruit> f = pattern.splitAsStream("Red apple, blue banana, orange")
.map(s -> {
    String[] parts = s.split(" ");
    String tmp = parts.length == 2
    ? parts[0]+"_"+parts[1]
    : s;
    return Fruit.valueOf(tmp.toUpperCase());
}).collect(Collectors.toList());

, - return.

Answer 2

:

f = pattern.splitAsStream(fruitString) 
        .map(s -> Arrays.stream(s.split(" ")).map(String::toUpperCase).collect(Collectors.joining("_"))) 
        .map(Fruit::valueOf).collect(Collectors.toList());

StreamEx:

StreamEx.split(fruitString, ", ")
        .map(s -> StreamEx.split(s, " ").map(String::toUpperCase).joining("_"))
        .map(Fruit::valueOf).toList();

Answer 3

static enum Fruit {
    RED_APPLE, BLUE_BANANA, ORANGE
}

:

public static void main(String[] ar) throws Exception {
    Pattern pattern = Pattern.compile(", ");
    List<Fruit> f = pattern.splitAsStream("Red apple, blue banana, orange")
            .map(YourClass::mapToFruit)
            .collect(Collectors.toList());
    System.out.println(f);
}

private static Fruit mapToFruit(String input) {
    String[] words = input.split("\\s");
    StringBuilder sb = new StringBuilder();
    if (words.length > 1) {
        for (int i = 0; i < words.length - 1; i++) {
            sb.append(words[i].toUpperCase());
            sb.append("_");
        }
        sb.append(words[words.length - 1].toUpperCase());
    } else {
        sb.append(words[0].toUpperCase());
    }
    return Fruit.valueOf(sb.toString());
}

Answer 4

String yourString = "Red apple, blue banana, orange";
stringArray = yourString.split(", ");
List<string> result;
//stringArray will contain 3 strings
//Red apple
//blue banana
//orange
for(string s : stringArray) {
    //Replace all spaces with underscores
    result.add(s.replace(" ", "_").toUpperCase());
}

Answer 5

, :

string[] output = fruitString.split(",");

, : `

for(int i = 0; i < output.length; i++){
   for(int j = 0; j < output[i].length(); j++){
       char c = output[i].charAt(j);
       //check for space and replace with _
   }
}

.toUpperCase(), char

, .

Answer 6

Please find the code below, I followed these steps:

1) First split the line.

2) Divide the result again 1) String by "".

3) Then, if the number of words is more than 1, then go on to add underlining.

Demo: http://rextester.com/NNDF87070

import java.util.*;
import java.lang.*;

class Rextester
{  
       public static int WordCount(String s){

        int wordCount = 0;

        boolean word = false;
        int endOfLine = s.length() - 1;

        for (int i = 0; i < s.length(); i++) {
            // if the char is a letter, word = true.
            if (Character.isLetter(s.charAt(i)) && i != endOfLine) {
                word = true;
                // if char isn't a letter and there have been letters before,
                // counter goes up.
            } else if (!Character.isLetter(s.charAt(i)) && word) {
                wordCount++;
                word = false;
                // last word of String; if it doesn't end with a non letter, it
                // wouldn't count without this.
            } else if (Character.isLetter(s.charAt(i)) && i == endOfLine) {
                wordCount++;
            }
        }
        return wordCount;
    }
    public static void main(String args[])
    {
         String cord = "Red apple , blue banana, orange";
        String[] parts = cord.split(",");
        String[] result1 = new String[parts.length];
        for(int i=0; i<parts.length;i++) {

            String[] part2 = parts[i].split(" ");

            if(parts[i].length() > 1 && WordCount(parts[i]) > 1)
            {
                String result = "_";
                String uscore = "_";
                for(int z =0; z < part2.length; z++)
                {
                    if(part2.length > 1 ) {
                        if (z + 1 < part2.length) {
                            result = part2[z] + uscore + part2[z + 1];
                        }
                    }
                }

                result1[i] = result.toUpperCase();
            }
            else
            {
                result1[i] = parts[i];
            }

        }

         for(int j =0 ; j <parts.length; j++)
        {
            System.out.println(result1[j]);
        }

    }
}

Links for the WordCount method: Read words in a string method?