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Rooted by: Number of numbers
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  • Code 
    import java.util.stream.Collectors;
import java.util.stream.IntStream;
import java.util.stream.Stream;

class Solution {
    public static String numberOfNumbers(int value) {
        String delimiter = getDelimiterFor(value);
        return IntStream.rangeClosed(1, Math.abs(value))
                .mapToObj(Solution::repeatByItself)
                .collect(Collectors.joining(delimiter));
    }
    
    private static String getDelimiterFor(int value){
        return value > 0 ? "-" : "+";
    }
    
    private static String repeatByItself(int i){
        return String.valueOf(i).repeat(i);
    }
}
     Test Cases 
    import org.junit.Test;
import static org.junit.Assert.assertEquals;
import org.junit.runners.JUnit4;

public class SolutionTest {
    @Test
    public void testWhenValueIsZero() {
        assertEquals("", Solution.numberOfNumbers(0));

    }

    @Test
    public void testPositiveValues() {
        assertEquals("1", Solution.numberOfNumbers(1));
        assertEquals("1-22", Solution.numberOfNumbers(2));
        assertEquals("1-22-333", Solution.numberOfNumbers(3));
        assertEquals("1-22-333-4444", Solution.numberOfNumbers(4));
        assertEquals("1-22-333-4444-55555", Solution.numberOfNumbers(5));
    }
    
    @Test
    public void testNegativeValues() {
        assertEquals("1", Solution.numberOfNumbers(-1));
        assertEquals("1+22", Solution.numberOfNumbers(-2));
        assertEquals("1+22+333", Solution.numberOfNumbers(-3));
        assertEquals("1+22+333+4444", Solution.numberOfNumbers(-4));
        assertEquals("1+22+333+4444+55555", Solution.numberOfNumbers(-5));
    }

    @Test
    public void testWithDoubleDigitValue() {
        assertEquals("1-22-333-4444-55555-666666-7777777-88888888-999999999-10101010101010101010", Solution.numberOfNumbers(10));
    }
}
    View Run Output
  • Code
    • import java.util.stream.Collectors;
    • import java.util.stream.IntStream;
    • import java.util.stream.Stream;
    • class Solution {
    • public static String numberOfNumbers(int value) {
    • String delimiter = getDelimiterFor(value);
    • return IntStream.rangeClosed(0, Math.abs(value))
    • return IntStream.rangeClosed(1, Math.abs(value))
    • .mapToObj(Solution::repeatByItself)
    • .filter(Solution::notBlank)
    • .collect(Collectors.joining(delimiter));
    • }
    • private static String getDelimiterFor(int value){
    • return value > 0 ? "-" : "+";
    • }
    • private static String repeatByItself(int i){
    • return String.valueOf(i).repeat(i);
    • }
    • private static boolean notBlank(String s){
    • return !s.isBlank();
    • }
    • }