BAEL-2312 - Abstract Classes in Java (#5598)

* Initial Commit * Add files via upload * Update UppercaseFileReaderUnitTest.java
2018-11-04 00:06:46 -03:00
parent 0befbceae3
commit c7b7d94409
9 changed files with 174 additions and 0 deletions
@@ -0,0 +1,30 @@
+package com.baeldung.abstractclasses.application;
+
+import com.baeldung.abstractclasses.filereaders.BaseFileReader;
+import com.baeldung.abstractclasses.filereaders.LowercaseFileReader;
+import com.baeldung.abstractclasses.filereaders.StandardFileReader;
+import com.baeldung.abstractclasses.filereaders.UppercaseFileReader;
+import java.io.IOException;
+
+public class Application {
+
+    public static void main(String[] args) throws IOException {
+        
+        Application application = new Application();
+        String filePath = application.getFilePathFromResourcesFolder("files/test.txt");
+            
+        BaseFileReader lowercaseFileReader = new LowercaseFileReader(filePath);
+        lowercaseFileReader.readFile().forEach(line -> System.out.println(line));
+
+        BaseFileReader upperCaseFileReader = new UppercaseFileReader(filePath);
+        upperCaseFileReader.readFile().forEach(line -> System.out.println(line));
+
+        BaseFileReader standardFileReader = new StandardFileReader(filePath);
+        standardFileReader.readFile().forEach(line -> System.out.println(line));
+         
+    }
+    
+    private String getFilePathFromResourcesFolder(String fileName) {
+        return getClass().getClassLoader().getResource(fileName).getPath().substring(1);
+    }
+}
@@ -0,0 +1,19 @@
+package com.baeldung.abstractclasses.filereaders;
+
+import java.io.IOException;
+import java.util.List;
+
+public abstract class BaseFileReader {
+    
+    protected String filePath;
+    
+    protected BaseFileReader(String filePath) {
+        this.filePath = filePath;
+    }
+    
+    public String getFilePath() {
+        return filePath;
+    }
+    
+    public abstract List<String> readFile() throws IOException;
+}
@@ -0,0 +1,21 @@
+package com.baeldung.abstractclasses.filereaders;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class LowercaseFileReader extends BaseFileReader {
+
+    public LowercaseFileReader(String filePath) {
+        super(filePath);
+    }
+    
+    @Override
+    public List<String> readFile() throws IOException {
+        return Files.lines(Paths.get(filePath))
+            .map(String::toLowerCase)
+            .collect(Collectors.toList());
+    }
+}
@@ -0,0 +1,19 @@
+package com.baeldung.abstractclasses.filereaders;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class StandardFileReader extends BaseFileReader {
+
+    public StandardFileReader(String filePath) {
+        super(filePath);
+    }
+    
+    @Override
+    public List<String> readFile() throws IOException {
+        return Files.lines(Paths.get(filePath)).collect(Collectors.toList());
+    }
+}
@@ -0,0 +1,21 @@
+package com.baeldung.abstractclasses.filereaders;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class UppercaseFileReader extends BaseFileReader {
+    
+    public UppercaseFileReader(String filePath) {
+        super(filePath);
+    }
+    
+    @Override
+    public List<String> readFile() throws IOException {
+        return Files.lines(Paths.get(filePath))
+            .map(String::toUpperCase)
+            .collect(Collectors.toList());
+    }
+}
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