fix: redundant byte and short cast (#538) (PR #539)

jadx-core/src/main/java/jadx/core/codegen/TypeGen.java

@@ -97,7 +97,7 @@ public class TypeGen {
 		if (s == Short.MIN_VALUE) {
 			return "Short.MIN_VALUE";
 		}
-		return "(short) " + s;
+		return Short.toString(s);
 	}
 
 	public static String formatByte(byte b) {
@@ -107,7 +107,7 @@ public class TypeGen {
 		if (b == Byte.MIN_VALUE) {
 			return "Byte.MIN_VALUE";
 		}
-		return "(byte) " + b;
+		return Byte.toString(b);
 	}
 
 	public static String formatInteger(int i) {

jadx-core/src/test/java/jadx/tests/integration/arrays/TestRedundantType.java

@@ -0,0 +1,77 @@
+package jadx.tests.integration.arrays;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+import jadx.core.dex.nodes.ClassNode;
+import jadx.tests.api.IntegrationTest;
+
+import static org.hamcrest.CoreMatchers.containsString;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+public class TestRedundantType extends IntegrationTest {
+
+	public static class TestCls {
+
+		public byte[] method() {
+	        return new byte[]{10, 11, 12};
+		}
+	}
+
+	@Test
+	public void test() {
+		ClassNode cls = getClassNode(TestCls.class);
+		String code = cls.getCode().toString();
+
+		assertThat(code, containsString("return new byte[]{10, 11, 12};"));
+	}
+
+	public static class TestByte {
+
+		public byte[] method() {
+			byte[] arr = new byte[50];
+			arr[10] = 126;
+			arr[20] = 127;
+			arr[30] = (byte) 128;
+			arr[40] = (byte) 129;
+	        return arr;
+		}
+	}
+
+	@Test
+	public void testByte() {
+		ClassNode cls = getClassNode(TestByte.class);
+		String code = cls.getCode().toString();
+
+		assertThat(code, containsString("arr[10] = 126"));
+		assertThat(code, containsString("arr[20] = Byte.MAX_VALUE"));
+		assertThat(code, containsString("arr[30] = Byte.MIN_VALUE"));
+		assertThat(code, containsString("arr[40] = -127"));
+		assertEquals(-127, new TestByte().method()[40]);
+	}
+
+	public static class TestShort {
+
+		public short[] method() {
+			short[] arr = new short[50];
+			arr[10] = 32766;
+			arr[20] = 32767;
+			arr[30] = (short) 32768;
+			arr[40] = (short) 32769;
+	        return arr;
+		}
+	}
+
+	@Test
+	public void testShort() {
+		ClassNode cls = getClassNode(TestShort.class);
+		String code = cls.getCode().toString();
+
+		assertThat(code, containsString("arr[10] = 32766"));
+		assertThat(code, containsString("arr[20] = Short.MAX_VALUE"));
+		assertThat(code, containsString("arr[30] = Short.MIN_VALUE"));
+		assertThat(code, containsString("arr[40] = -32767"));
+		assertEquals(-32767, new TestShort().method()[40]);
+	}
+}

jadx-core/src/test/java/jadx/tests/integration/types/TestTypeResolver4.java

@@ -41,7 +41,7 @@ public class TestTypeResolver4 extends IntegrationTest {
 		ClassNode cls = getClassNode(TestCls.class);
 		String code = cls.getCode().toString();
 
-		assertThat(code, containsOne("(strArray[end] != (byte) 0 || strArray[end + 1] != (byte) 0)"));
+		assertThat(code, containsOne("(strArray[end] != 0 || strArray[end + 1] != 0)"));
 	}
 
 	@Test