Merge pull request #15649 from anujgaud/convert-byte-2-int

[BAEL-7462] Convert byte to int

core-java-modules/core-java-numbers-conversions/src/main/java/com/baeldung/bytetoint/ByteToIntConversion.java

@@ -0,0 +1,25 @@
+package com.baeldung.bytetoint;
+
+public class ByteToIntConversion {
+    static int usingTypeCasting(byte b){
+        int i = b;
+        return i;
+    }
+
+    static int usingIntegerValueOf(byte b){
+        return Integer.valueOf(b);
+    }
+
+    static int usingByteIntValue(byte b){
+        Byte byteObj = new Byte(b);
+        return byteObj.intValue();
+    }
+
+    static int usingMathToIntExact(byte b){
+        return Math.toIntExact(b);
+    }
+
+    static int usingByteUnsignedInt(byte b){
+        return Byte.toUnsignedInt(b);
+    }
+}

core-java-modules/core-java-numbers-conversions/src/test/java/com/baeldung/bytetoint/ByteToIntConversionUnitTest.java

@@ -0,0 +1,45 @@
+package com.baeldung.bytetoint;
+
+import org.junit.Test;
+import static org.junit.Assert.assertEquals;
+
+public class ByteToIntConversionUnitTest {
+    @Test
+    public void givenByte_whenUsingTypeCasting_thenConvertToInt() {
+        byte b = -51;
+        int result = ByteToIntConversion.usingTypeCasting(b);
+            assertEquals(-51, result);
+    }
+
+    @Test
+    void givenByte_whenUsingIntegerValueOf_thenConvertToInt() {
+        byte b = -51;
+        int result = ByteToIntConversion.usingIntegerValueOf(b);
+
+        assertEquals(-51, result);
+    }
+
+    @Test
+    void givenByte_whenUsingByteIntValue_thenConvertToInt() {
+        byte b = -51;
+        int result = ByteToIntConversion.usingByteIntValue(b);
+
+        assertEquals(-51, result);
+    }
+
+    @Test
+    void givenByte_whenUsingMathToIntExact_thenConvertToInt() {
+        byte b = -51;
+        int result = ByteToIntConversion.usingMathToIntExact(b);
+
+        assertEquals(-51, result);
+    }
+
+    @Test
+    void givenByte_whenUsingByteUnsignedInt_thenConvertToInt() {
+        byte b = -51;
+        int result = ByteToIntConversion.usingByteUnsignedInt(b);
+
+        assertEquals(205, result);
+    }
+}