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Code samples of Java #18830

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Code samples of Java #18830

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976e277
Add EBCDIC to ASCII conversion example
Sourov72 Sep 26, 2025
79417bc
Add files via upload
Sourov72 Sep 26, 2025
b0df8ea
Add unit tests for EBCDIC to ASCII conversion
Sourov72 Nov 9, 2025
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12 changes: 12 additions & 0 deletions core-java-modules/core-java-string-conversions-4/EBCDIC_to_ASCII/ASCII_EBCDIC_Example.java
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import java.nio.charset.Charset;

class Main {
public static void main(String[] args) {
// Example: EBCDIC bytes for "ABC" (in Cp037)
byte[] ebcdicBytes = new byte[] { (byte)0xC1, (byte)0xC2, (byte)0xC3 };

// Convert to String using EBCDIC Cp037 charset
String text = new String(ebcdicBytes, Charset.forName("Cp037"));
System.out.println(text);
}
}
30 changes: 30 additions & 0 deletions core-java-modules/core-java-string-conversions-4/EBCDIC_to_ASCII/Alternative_approach.java
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import java.io.*;
import java.nio.charset.*;

public class EbcdicStreamConverter {

public static void main(String[] args) {
try (
InputStreamReader reader = new InputStreamReader(
new FileInputStream("input.ebc"),
Charset.forName("Cp037")
);
OutputStreamWriter writer = new OutputStreamWriter(
new FileOutputStream("output.txt"),
StandardCharsets.US_ASCII
)
) {
char[] buffer = new char[1024];
int length;

while ((length = reader.read(buffer)) != -1) {
writer.write(buffer, 0, length);
}

System.out.println("Conversion complete! See output.txt");

} catch (IOException e) {
e.printStackTrace();
}
}
}
21 changes: 21 additions & 0 deletions core-java-modules/core-java-string-conversions-4/EBCDIC_to_ASCII/practical_example.java
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import java.io.*;
import java.nio.charset.*;

public class EbcdicToAsciiExample {

public static void main(String[] args) throws Exception {
// Step 1: Read raw EBCDIC bytes from file
FileInputStream fis = new FileInputStream("input.ebc");
byte[] ebcdicData = fis.readAllBytes();
fis.close();

// Step 2: Decode EBCDIC bytes to Unicode string
String unicodeText = new String(ebcdicData, Charset.forName("Cp037"));

// Step 3: Encode Unicode string to ASCII bytes
byte[] asciiData = unicodeText.getBytes(StandardCharsets.US_ASCII);

// Step 4: Print final ASCII string
System.out.println(new String(asciiData, StandardCharsets.US_ASCII));
}
}
15 changes: 15 additions & 0 deletions ...-java-modules/core-java-string-conversions-4/EBCDIC_to_ASCII/step_by_step_conversion.java
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import java.nio.charset.Charset; import java.nio.charset.StandardCharsets;
class Main
{
public static void main(String[] args) {
// Step 0: Example EBCDIC bytes ("HELLO" in Cp037)
byte[] ebcdicData = { (byte)0xC8, (byte)0x85, (byte)0x93, (byte)0x93, (byte)0x96 };
// Step 1: Decode from EBCDIC (Cp037) to Unicode string
String unicodeText = new String(ebcdicData, Charset.forName("Cp037"));
// Step 2: Encode from Unicode string to ASCII bytes
byte[] asciiData = unicodeText.getBytes(StandardCharsets.US_ASCII);
// Step 3: Print final ASCII string
System.out.println(new String(asciiData, StandardCharsets.US_ASCII));
}

}
98 changes: 98 additions & 0 deletions core-java-modules/core-java-string-conversions-4/EBCDIC_to_ASCII/unit_test.java
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import java.io.*;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;

public class EBCDICConversionTest {

public static void main(String[] args) throws Exception {
testBasicEBCDICToAsciiExample();
testStepByStepConversion();
testFileBasedConversion();
testStreamingConversion();
System.out.println("✅ All tests passed!");
}

static void assertEquals(String expected, String actual) {
if (!expected.equals(actual)) {
throw new AssertionError("Expected: [" + expected + "], but got: [" + actual + "]");
}
}

static void testBasicEBCDICToAsciiExample() {
// Example: EBCDIC bytes for "ABC" (in Cp037)
byte[] ebcdicBytes = new byte[] { (byte) 0xC1, (byte) 0xC2, (byte) 0xC3 };
String text = new String(ebcdicBytes, Charset.forName("Cp037"));
System.out.println("Decoded text: " + text);
assertEquals("ABC", text);
}

static void testStepByStepConversion() {
// Example EBCDIC bytes ("Hello" in Cp037)
byte[] ebcdicData = { (byte) 0xC8, (byte) 0x85, (byte) 0x93, (byte) 0x93, (byte) 0x96 };
String unicodeText = new String(ebcdicData, Charset.forName("Cp037"));
assertEquals("Hello", unicodeText);

byte[] asciiData = unicodeText.getBytes(StandardCharsets.US_ASCII);
assertEquals("Hello", new String(asciiData, StandardCharsets.US_ASCII));

System.out.println("Step-by-step conversion OK: " + new String(asciiData));
}

static void testFileBasedConversion() throws Exception {
File tempFile = File.createTempFile("input", ".ebc");
tempFile.deleteOnExit();

// "TEST" in Cp037 (all uppercase)
byte[] ebcdicData = { (byte) 0xE3, (byte) 0xC5, (byte) 0xE2, (byte) 0xE3 };
try (FileOutputStream fos = new FileOutputStream(tempFile)) {
fos.write(ebcdicData);
}

byte[] rawBytes = new FileInputStream(tempFile).readAllBytes();
String unicodeText = new String(rawBytes, Charset.forName("Cp037"));
assertEquals("TEST", unicodeText);

byte[] asciiData = unicodeText.getBytes(StandardCharsets.US_ASCII);
assertEquals("TEST", new String(asciiData, StandardCharsets.US_ASCII));

System.out.println("File-based conversion OK: " + unicodeText);
}

static void testStreamingConversion() throws IOException {
File input = File.createTempFile("input", ".ebc");
File output = File.createTempFile("output", ".txt");
input.deleteOnExit();
output.deleteOnExit();

// "JAVA" in Cp037 (all uppercase)
byte[] ebcdicData = { (byte) 0xD1, (byte) 0xC1, (byte) 0xE5, (byte) 0xC1 };
try (FileOutputStream fos = new FileOutputStream(input)) {
fos.write(ebcdicData);
}

try (
InputStreamReader reader = new InputStreamReader(
new FileInputStream(input),
Charset.forName("Cp037")
);
OutputStreamWriter writer = new OutputStreamWriter(
new FileOutputStream(output),
StandardCharsets.US_ASCII
)
) {
char[] buffer = new char[1024];
int length;
while ((length = reader.read(buffer)) != -1) {
writer.write(buffer, 0, length);
}
}

String result = new String(
new FileInputStream(output).readAllBytes(),
StandardCharsets.US_ASCII
);
assertEquals("JAVA", result);

System.out.println("Streaming conversion OK: " + result);
}
}