JAVA-1522 Split core-java-modules/core-java module

core-java-modules/core-java-string-operations-2/src/main/java/com/baeldung/encoding/CharacterEncodingExamples.java

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+package com.baeldung.encoding;
+
+import java.io.BufferedReader;
+import java.io.ByteArrayInputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.UnsupportedEncodingException;
+import java.nio.charset.Charset;
+import java.nio.charset.CharsetDecoder;
+import java.nio.charset.CodingErrorAction;
+
+public class CharacterEncodingExamples {
+
+    static String readFile(String filePath, String encoding) throws IOException {
+        File file = new File(filePath);
+        StringBuffer buffer = new StringBuffer();
+        try (InputStreamReader isr = new InputStreamReader(new FileInputStream(file), encoding)) {
+            int data;
+            while ((data = isr.read()) != -1) {
+                buffer.append((char) data);
+            }
+        }
+        return buffer.toString();
+    }
+
+    static String convertToBinary(String input, String encoding) throws UnsupportedEncodingException {
+        byte[] bytes = input.getBytes(encoding);
+        StringBuffer buffer = new StringBuffer();
+        for (int b : bytes) {
+            buffer.append(Integer.toBinaryString((b + 256) % 256));
+            buffer.append(" ");
+        }
+        return buffer.toString();
+    }
+
+    static String decodeText(String input, Charset charset, CodingErrorAction codingErrorAction) throws IOException {
+        CharsetDecoder charsetDecoder = charset.newDecoder();
+        charsetDecoder.onMalformedInput(codingErrorAction);
+        return new BufferedReader(
+          new InputStreamReader(
+            new ByteArrayInputStream(input.getBytes()), charsetDecoder)).readLine();
+    }
+}

core-java-modules/core-java-string-operations-2/src/test/java/com/baeldung/hexToAscii/HexToAsciiUnitTest.java

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+package com.baeldung.hexToAscii;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class HexToAsciiUnitTest {
+
+    @Test
+    public void whenHexToAscii() {
+        String asciiString = "http://www.baeldung.com/jackson-serialize-dates";
+        String hexEquivalent = "687474703a2f2f7777772e6261656c64756e672e636f6d2f6a61636b736f6e2d73657269616c697a652d6461746573";
+
+        assertEquals(asciiString, hexToAscii(hexEquivalent));
+    }
+
+    @Test
+    public void whenAsciiToHex() {
+        String asciiString = "http://www.baeldung.com/jackson-serialize-dates";
+        String hexEquivalent = "687474703a2f2f7777772e6261656c64756e672e636f6d2f6a61636b736f6e2d73657269616c697a652d6461746573";
+
+        assertEquals(hexEquivalent, asciiToHex(asciiString));
+    }
+
+    //
+
+    private static String asciiToHex(String asciiStr) {
+        char[] chars = asciiStr.toCharArray();
+        StringBuilder hex = new StringBuilder();
+        for (char ch : chars) {
+            hex.append(Integer.toHexString((int) ch));
+        }
+
+        return hex.toString();
+    }
+
+    private static String hexToAscii(String hexStr) {
+        StringBuilder output = new StringBuilder("");
+        for (int i = 0; i < hexStr.length(); i += 2) {
+            String str = hexStr.substring(i, i + 2);
+            output.append((char) Integer.parseInt(str, 16));
+        }
+        return output.toString();
+    }
+
+}

core-java-modules/core-java-string-operations-2/src/test/java/com/baeldung/hexToAscii/README.md

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+### Relevant Articles:
+- [Convert Hex to ASCII in Java](http://www.baeldung.com/java-convert-hex-to-ascii)