basler1337@gmail.com feat add element to array list at specific index (#13025)
* feat add element to array list at specific index * add unit test for add element at index
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package com.baeldung.list.addelementatindex;
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import org.junit.jupiter.api.Test;
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import java.util.ArrayList;
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import java.util.List;
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import static org.assertj.core.api.Assertions.assertThat;
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class AddElementAtIndexUnitTest {
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@Test
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void givenArrayList_whenAddElementAtIndex_thenGetExpectedElementAtIndex() {
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List<Integer> integers = new ArrayList<>();
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// add some elements
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integers.add(5);
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integers.add(6);
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integers.add(7);
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integers.add(8);
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assertThat(integers.get(0)).isEqualTo(5);
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assertThat(integers.get(1)).isEqualTo(6);
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assertThat(integers.get(2)).isEqualTo(7);
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assertThat(integers.get(3)).isEqualTo(8);
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// add an element at a specific index
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integers.add(1, 9);
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assertThat(integers.get(0)).isEqualTo(5);
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assertThat(integers.get(1)).isEqualTo(9);
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assertThat(integers.get(2)).isEqualTo(6);
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assertThat(integers.get(3)).isEqualTo(7);
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assertThat(integers.get(4)).isEqualTo(8);
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// sort the array list
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integers.sort(Integer::compareTo);
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assertThat(integers.get(0)).isEqualTo(5);
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assertThat(integers.get(1)).isEqualTo(6);
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assertThat(integers.get(2)).isEqualTo(7);
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assertThat(integers.get(3)).isEqualTo(8);
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assertThat(integers.get(4)).isEqualTo(9);
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}
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}
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