Add initial solution

.gitignore

@@ -1,6 +1,11 @@
 # Compiled class file
 *.class
 
+target
+
+# Scratch files
+Scratch*
+
 # Log file
 *.log
 

.sdkmanrc

@@ -0,0 +1,5 @@
+# Enable auto-env through the sdkman_auto_env config
+# Add key=value pairs of SDKs to use below
+java=17.0.3.6.1-amzn
+maven=3.8.6
+

.settings/org.eclipse.jdt.core.prefs

@@ -1,9 +1,9 @@
 eclipse.preferences.version=1
-org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.7
-org.eclipse.jdt.core.compiler.compliance=1.7
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.compliance=1.8
 org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
 org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
 org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=ignore
 org.eclipse.jdt.core.compiler.processAnnotations=disabled
 org.eclipse.jdt.core.compiler.release=disabled
-org.eclipse.jdt.core.compiler.source=1.7
+org.eclipse.jdt.core.compiler.source=1.8

inputs/day01.txt

@@ -1 +1,4 @@
-Test file
+1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet

pom.xml

@@ -14,8 +14,9 @@
  <properties>
  <service.mainClass>com.jonathanmorris.Main</service.mainClass>
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
- <maven.compiler.source>1.7</maven.compiler.source>
- <maven.compiler.target>1.7</maven.compiler.target>
+ <java.version>1.8</java.version>
+ <maven.compiler.source>1.8</maven.compiler.source>
+ <maven.compiler.target>1.8</maven.compiler.target>
  </properties>
 
  <dependencies>

src/main/java/com/jonathanmorris/challenges/Day01Challenge.java

@@ -1,5 +1,7 @@
 package com.jonathanmorris.challenges;
 
+import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 
 import org.slf4j.Logger;
@@ -13,6 +15,33 @@ public class Day01Challenge implements Challenge {
 
  @Override
  public void execute(final List<String> lines) {
- logger.debug("Lines: {}", lines);
+ List<Integer> numbers = new ArrayList<>();
+ numbers.toString();
+ String firstNumber = "";
+ String lastNumber = "";
+ for (String line : lines) {
+ logger.info("Current line is: {}", line);
+ List<String> chars = Arrays.asList(line.trim().split(""));
+ for (String currentChar : chars) {
+ if (isNumber(currentChar)) {
+ firstNumber = currentChar;
+ break;
+ }
+ }
+ for (int i = chars.size() - 1; i >= 0; i--) {
+ String currentChar = chars.get(i);
+ if (isNumber(currentChar)) {
+ lastNumber = currentChar;
+ break;
+ }
+ }
+ numbers.add(Integer.parseInt(String.format("%s%s", firstNumber, lastNumber)));
+ }
+ int result = numbers.stream().reduce(0, Integer::sum);
+ logger.info("Result is: {}", result);
+ }
+
+ private Boolean isNumber(final String currentChar) {
+ return currentChar.matches("[0-9]");
  }
 }