Get the string representation of an Iterable

Write a function that takes an iterable and a delimeter as input and get the string representation of iterbale.

 

Signature

public static <T> String toString(final Iterable<T> iterable, final String delimiter, final boolean skipNull)

 

Find the below working application.

IterableToString.java

package com.sample.app.collections;

import java.util.Arrays;
import java.util.List;
import java.util.StringJoiner;

public class IterableToString {

	/**
	 * 
	 * @param <T>
	 * @param delimiter use comma (,), if it is null
	 * @param iterable
	 * @param skipNull, skip null values, it it is set to true, else add the string
	 *                  "null" for null values.
	 * 
	 * @return a string representation of the given iterable. Elements in the
	 *         iterable are separated by given delimeter.
	 */
	public static <T> String toString(final Iterable<T> iterable, final String delimiter, final boolean skipNull) {

		if (iterable == null) {
			return "";
		}

		String delimeterToUse = delimiter;

		if (delimiter == null) {
			delimeterToUse = ",";
		}

		final StringJoiner stringJoiner = new StringJoiner(delimeterToUse);

		for (T ele : iterable) {
			if (skipNull == true && ele == null) {
				continue;
			}

			if (ele == null) {
				stringJoiner.add("null");
			} else {
				stringJoiner.add(ele.toString());
			}

		}

		return stringJoiner.toString();

	}

	public static void main(String[] args) {
		List<Object> list = Arrays.asList(1, "krishna", null, 34, "Bangalore", true);

		String str1 = toString(list, "->", false);
		String str2 = toString(list, "->", true);

		System.out.println(str1);
		System.out.println(str2);

	}

}

 

Output

1->krishna->null->34->Bangalore->true
1->krishna->34->Bangalore->true

 

 

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