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BAEL-3214 | Code review related changes - 1

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This commit is contained in:
Nikunj Gandhi 2019-09-19 15:26:45 -04:00
parent 31be377141
commit 4e063a1120
2 changed files with 17 additions and 62 deletions
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37
core-java-modules/core-java-io-2/src/main/java/com/baeldung/filewriter/FileWriterExample.java
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@ -1,37 +0,0 @@
package com.baeldung.filewriter;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.util.List;
public class FileWriterExample {
public void writeString(String fileName, String strToWrite) throws IOException {
try (FileWriter fileWriter = new FileWriter(fileName)) {
fileWriter.write(strToWrite);
}
}
public void appendString(String fileName, String stringToAppend) throws IOException {
try (FileWriter fileWriter = new FileWriter(fileName, true)) {
fileWriter.append(stringToAppend);
}
}
public void writeCharArray(String fileName, char[] charArrToWrite) throws IOException {
try (FileWriter fileWriter = new FileWriter(fileName)) {
fileWriter.write(charArrToWrite);
}
}
public void writeWithBufferedWriter(String fileName, List<String> stringsToWrite) throws IOException {
try (FileWriter fileWriter = new FileWriter(fileName); BufferedWriter bufferedWriter = new BufferedWriter(fileWriter)) {
for (String stringToWrite : stringsToWrite) {
bufferedWriter.write(stringToWrite);
}
}
}
}

42
core-java-modules/core-java-io-2/src/test/java/com/baeldung/filewriter/FileWriterExampleUnitTest.java
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@ -1,12 +1,9 @@
package com.baeldung.filewriter; package com.baeldung.filewriter;
import java.io.FileWriter;
import java.io.IOException; import java.io.IOException;
import java.nio.file.Files; import java.nio.file.Files;
import java.nio.file.Path; import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.stream.IntStream;
import org.junit.After; import org.junit.After;
import org.junit.Assert; import org.junit.Assert;
@ -15,11 +12,6 @@ import org.junit.Test;
public class FileWriterExampleUnitTest { public class FileWriterExampleUnitTest {
private static final String FILE_NAME = "src/test/resources/FileWriterTest.txt"; private static final String FILE_NAME = "src/test/resources/FileWriterTest.txt";
private static final String STRING_TO_WRITE = "Hello Folks!";
private static final String STRING_TO_APPEND = "Hello Folks Again!";
private static final char[] CHAR_ARRAY_TO_WRITE = STRING_TO_WRITE.toCharArray();
private FileWriterExample fileWriterExample = new FileWriterExample();
@After @After
public void tearDown() throws IOException { public void tearDown() throws IOException {
@ -28,30 +20,30 @@ public class FileWriterExampleUnitTest {
@Test @Test
public void testWriteString() throws IOException { public void testWriteString() throws IOException {
fileWriterExample.writeString(FILE_NAME, STRING_TO_WRITE); try (FileWriter fileWriter = new FileWriter(FILE_NAME)) {
Assert.assertEquals(STRING_TO_WRITE, new String(Files.readAllBytes(Path.of(FILE_NAME)))); fileWriter.write("Hello Folks!");
}
Assert.assertEquals("Hello Folks!", new String(Files.readAllBytes(Path.of(FILE_NAME))));
} }
@Test @Test
public void testAppendString() throws IOException { public void testAppendString() throws IOException {
fileWriterExample.writeString(FILE_NAME, STRING_TO_WRITE); try (FileWriter fileWriter = new FileWriter(FILE_NAME)) {
fileWriterExample.appendString(FILE_NAME, STRING_TO_APPEND); fileWriter.write("Hello Folks!");
Assert.assertEquals(STRING_TO_WRITE + STRING_TO_APPEND, new String(Files.readAllBytes(Path.of(FILE_NAME)))); }
// using another try with resources to reopen the file in append mode
try (FileWriter fileWriter = new FileWriter(FILE_NAME, true)) {
fileWriter.write("Hello Folks Again!");
}
Assert.assertEquals("Hello Folks!" + "Hello Folks Again!", new String(Files.readAllBytes(Path.of(FILE_NAME))));
} }
@Test @Test
public void testWriteCharArray() throws IOException { public void testWriteCharArray() throws IOException {
fileWriterExample.writeCharArray(FILE_NAME, CHAR_ARRAY_TO_WRITE); try (FileWriter fileWriter = new FileWriter(FILE_NAME)) {
Assert.assertEquals(STRING_TO_WRITE, new String(Files.readAllBytes(Path.of(FILE_NAME)))); fileWriter.write("Hello Folks!".toCharArray());
}
@Test
public void testWriteWithBufferedWriter() throws IOException{
final List<String> stringsToWrite = new ArrayList<>();
for(int i=0 ; i < 10000;i++) {
stringsToWrite.add("Random string "+i);
} }
fileWriterExample.writeWithBufferedWriter(FILE_NAME, stringsToWrite); Assert.assertEquals("Hello Folks!", new String(Files.readAllBytes(Path.of(FILE_NAME))));
Assert.assertNotNull(new String(Files.readAllBytes(Path.of(FILE_NAME))));
} }
} }