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BAEL-2562 New section in Generics article

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mikr 2019-03-10 19:28:09 +01:00 committed by ashleyfrieze
parent 94917d8755
commit bde5b5f559
2 changed files with 16 additions and 0 deletions
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7
core-java-lang-syntax/src/main/java/com/baeldung/generics/Generics.java
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@ -1,5 +1,6 @@
package com.baeldung.generics; package com.baeldung.generics;
import java.util.ArrayList;
import java.util.Arrays; import java.util.Arrays;
import java.util.List; import java.util.List;
import java.util.function.Function; import java.util.function.Function;
@ -28,4 +29,10 @@ public class Generics {
buildings.forEach(Building::paint); buildings.forEach(Building::paint);
} }
public static List<Integer> createList(int a) {
List<Integer> list = new ArrayList<>();
list.add(a);
return list;
}
} }

9
core-java-lang-syntax/src/test/java/com/baeldung/generics/GenericsUnitTest.java
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@ -6,6 +6,7 @@ import java.util.ArrayList;
import java.util.List; import java.util.List;
import static org.hamcrest.CoreMatchers.hasItems; import static org.hamcrest.CoreMatchers.hasItems;
import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.MatcherAssert.assertThat; import static org.hamcrest.MatcherAssert.assertThat;
import static org.junit.Assert.fail; import static org.junit.Assert.fail;
@ -66,4 +67,12 @@ public class GenericsUnitTest {
} }
} }
@Test
public void givenAnInt_whenAddedToAGenericIntegerList_thenAListItemCanBeAssignedToAnInt() {
int number = 7;
List<Integer> list = Generics.createList(number);
int otherNumber = list.get(0);
assertThat(otherNumber, is(number));
}
} }