77 lines
2.3 KiB
Java
77 lines
2.3 KiB
Java
package com.baeldung.map.copyhashmap;
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import com.google.common.collect.ImmutableMap;
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import org.junit.Test;
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import java.util.HashMap;
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import java.util.Map;
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import static org.assertj.core.api.Assertions.assertThat;
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public class CopyHashMapUnitTest {
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@Test
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public void givenHashMap_whenShallowCopy_thenCopyisNotSameAsOriginal() {
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HashMap<String, Employee> map = new HashMap<>();
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Employee emp1 = new Employee("John");
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Employee emp2 = new Employee("Norman");
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map.put("emp1",emp1);
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map.put("emp2",emp2);
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HashMap<String, Employee> shallowCopy = CopyHashMap.shallowCopy(map);
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assertThat(shallowCopy).isNotSameAs(map);
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}
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@Test
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public void givenHashMap_whenShallowCopyModifyingOriginalObject_thenCopyShouldChange() {
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HashMap<String, Employee> map = new HashMap<>();
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Employee emp1 = new Employee("John");
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Employee emp2 = new Employee("Norman");
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map.put("emp1",emp1);
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map.put("emp2",emp2);
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HashMap<String, Employee> shallowCopy = CopyHashMap.shallowCopy(map);
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emp1.setName("Johny");
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assertThat(shallowCopy.get("emp1")).isEqualTo(map.get("emp1"));
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}
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@Test
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public void givenHashMap_whenDeepCopyModifyingOriginalObject_thenCopyShouldNotChange() {
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HashMap<String, Employee> map = new HashMap<>();
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Employee emp1 = new Employee("John");
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Employee emp2 = new Employee("Norman");
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map.put("emp1",emp1);
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map.put("emp2",emp2);
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HashMap<String, Employee> deepCopy = CopyHashMap.deepCopy(map);
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emp1.setName("Johny");
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assertThat(deepCopy.get("emp1")).isNotEqualTo(map.get("emp1"));
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}
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@Test
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public void givenImmutableMap_whenCopyUsingGuava_thenCopyShouldNotChange() {
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Employee emp1 = new Employee("John");
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Employee emp2 = new Employee("Norman");
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Map<String, Employee> map = ImmutableMap.<String, Employee> builder()
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.put("emp1",emp1)
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.put("emp2",emp2)
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.build();
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Map<String, Employee> shallowCopy = ImmutableMap.copyOf(map);
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assertThat(shallowCopy).isSameAs(map);
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}
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}
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