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Comment convertir un caractère en ASCII en Java

Comment convertir un caractère en ASCII en Java

En Java, convertir le caractère en ASCII est assez simple, il suffit de convertir le caractère en int.

Convertir le caractère en ASCII 

int ascii = (int) character;

Convertir ASCII en caractère 

char character = (char)ascii;

Exemple en Java 

package com.example.common;
/**
 * Character Utility class
 * @author example
 *
 */
public class CharUtils
{
    /**
     * Convert the characters to ASCII value
     * @param character character
     * @return ASCII value
     */
    public static int CharToASCII(final char character){
        return (int)character;
    }

    /**
     * Convert the ASCII value to character
     * @param ascii ascii value
     * @return character value
     */
    public static char ASCIIToChar(final int ascii){
        return (char)ascii;
    }
}

Test de l'unité 

package com.example.common;
import org.testng.Assert;
import org.testng.annotations.*;
/**
 * Character Utils Testing
 * @author example
 *
 */
public class CharUtilsTest {

    @DataProvider
    public Object[][] ValidDataProvider() {
        return new Object[][]{
                { 'A', 65 },{ 'a', 97 },
                { 'B', 66 },{ 'b', 98 },
                { 'C', 67 },{ 'c', 99 },
                { 'D', 68 },{ 'd', 100 },
                { 'Z', 90 },{ 'z', 122 },
                { '1', 49 },{ '9', 57 },

        };
    }

    @Test(dataProvider = "ValidDataProvider")
    public void CharToASCIITest(final char character, final int ascii) {
           int result = CharUtils.CharToASCII(character);
           Assert.assertEquals(result, ascii);
    }

    @Test(dataProvider = "ValidDataProvider")
    public void ASCIIToCharTest(final char character, final int ascii) {
           char result = CharUtils.ASCIIToChar(ascii);
           Assert.assertEquals(result, character);
    }
}

Résultat du test unitaire 

PASSED: CharToASCIITest(A, 65)
PASSED: CharToASCIITest(a, 97)
PASSED: CharToASCIITest(B, 66)
PASSED: CharToASCIITest(b, 98)
PASSED: CharToASCIITest(C, 67)
PASSED: CharToASCIITest(c, 99)
PASSED: CharToASCIITest(D, 68)
PASSED: CharToASCIITest(d, 100)
PASSED: CharToASCIITest(Z, 90)
PASSED: CharToASCIITest(z, 122)
PASSED: CharToASCIITest(1, 49)
PASSED: CharToASCIITest(9, 57)
PASSED: ASCIIToCharTest(A, 65)
PASSED: ASCIIToCharTest(a, 97)
PASSED: ASCIIToCharTest(B, 66)
PASSED: ASCIIToCharTest(b, 98)
PASSED: ASCIIToCharTest(C, 67)
PASSED: ASCIIToCharTest(c, 99)
PASSED: ASCIIToCharTest(D, 68)
PASSED: ASCIIToCharTest(d, 100)
PASSED: ASCIIToCharTest(Z, 90)
PASSED: ASCIIToCharTest(z, 122)
PASSED: ASCIIToCharTest(1, 49)
PASSED: ASCIIToCharTest(9, 57)

===============================================
    com.example.common.CharUtilsTest
    Tests run: 24, Failures: 0, Skips: 0
===============================================


===============================================
example
Total tests run: 24, Failures: 0, Skips: 0
===============================================

Référence

http://www.asciitable.com/

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