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Merge pull request #9794 from LeasyZhang/determin-primitive-objects 

LeasyZhang/shiwangzhihe@gmail.com
This commit is contained in:
Jonathan Cook 2020-08-07 11:07:15 +02:00 committed by GitHub
parent 8bd498752d 54796738f8
commit 53a869163c
3 changed files with 68 additions and 0 deletions
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8
core-java-modules/core-java-lang-oop-types/pom.xml
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@ -12,4 +12,12 @@
<artifactId>core-java-lang-oop-types</artifactId>
<name>core-java-lang-oop-types</name>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>${commons-lang3.version}</version>
</dependency>
</dependencies>
</project>

26
core-java-modules/core-java-lang-oop-types/src/main/java/com/baeldung/primitivetype/PrimitiveTypeUtil.java Normal file
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@ -0,0 +1,26 @@
package com.baeldung.primitivetype;
import java.util.HashMap;
import java.util.Map;
public class PrimitiveTypeUtil {
private static final Map<Class<?>, Class<?>> WRAPPER_TYPE_MAP;
static {
WRAPPER_TYPE_MAP = new HashMap<Class<?>, Class<?>>(16);
WRAPPER_TYPE_MAP.put(Integer.class, int.class);
WRAPPER_TYPE_MAP.put(Byte.class, byte.class);
WRAPPER_TYPE_MAP.put(Character.class, char.class);
WRAPPER_TYPE_MAP.put(Boolean.class, boolean.class);
WRAPPER_TYPE_MAP.put(Double.class, double.class);
WRAPPER_TYPE_MAP.put(Float.class, float.class);
WRAPPER_TYPE_MAP.put(Long.class, long.class);
WRAPPER_TYPE_MAP.put(Short.class, short.class);
WRAPPER_TYPE_MAP.put(Void.class, void.class);
}
public static boolean isPrimitiveType(Object source) {
return WRAPPER_TYPE_MAP.containsKey(source.getClass());
}
}

34
core-java-modules/core-java-lang-oop-types/src/test/java/com/baeldung/primitivetype/PrimitiveTypeUnitTest.java Normal file
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@ -0,0 +1,34 @@
package com.baeldung.primitivetype;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import org.apache.commons.lang3.ClassUtils;
import org.apache.commons.lang3.StringUtils;
import org.junit.Test;
import com.google.common.primitives.Primitives;
public class PrimitiveTypeUnitTest {
@Test
public void givenAClass_whenCheckWithPrimitiveTypeUtil_thenShouldValidate() {
assertTrue(PrimitiveTypeUtil.isPrimitiveType(false));
assertTrue(PrimitiveTypeUtil.isPrimitiveType(1L));
assertFalse(PrimitiveTypeUtil.isPrimitiveType(StringUtils.EMPTY));
}
@Test
public void givenAClass_whenCheckWithCommonsLang_thenShouldValidate() {
assertTrue(ClassUtils.isPrimitiveOrWrapper(Boolean.FALSE.getClass()));
assertTrue(ClassUtils.isPrimitiveOrWrapper(boolean.class));
assertFalse(ClassUtils.isPrimitiveOrWrapper(StringUtils.EMPTY.getClass()));
}
@Test
public void givenAClass_whenCheckWithGuava_thenShouldValidate() {
assertTrue(Primitives.isWrapperType(Boolean.FALSE.getClass()));
assertFalse(Primitives.isWrapperType(StringUtils.EMPTY.getClass()));
assertFalse(Primitives.isWrapperType(Boolean.TYPE.getClass()));
}
}