Merge pull request kenshin579#84 from kenshin579/tutorials-progress

kenshin579 · web-flow · commit 3cf2c384349f · 2020-10-18T21:03:50.000+09:00
코드 정리
diff --git a/java8/src/test/java/com/advenoh/streams/ConvertListToMapTest.java b/java8/src/test/java/com/advenoh/streams/ConvertListToMapTest.java
@@ -5,6 +5,7 @@
 import lombok.extern.slf4j.Slf4j;
 import org.junit.Test;
 
+import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.stream.Collectors;
@@ -17,46 +18,66 @@
 public class ConvertListToMapTest {
 
 	@Test
-	public void convert_students_to_map1() {
+	public void convert_students_to_map_of_nameVsAge_beforeJava8() {
 		int max = 3;
 		List<Student> students = TestUtil.getStudentSample(max);
+		Map<String, Integer> nameVsAgeMap = new HashMap<>();
+		Student student;
+		for (int i = 0; i < students.size(); i++) {
+			student = students.get(i);
+			nameVsAgeMap.put(student.getName(), student.getAge());
+		}
 
-		Map<String, Integer> nameVsAgeMap1 = students
+		assertThat(nameVsAgeMap.size()).isEqualTo(max);
+		log.info("nameVsAgeMap : {}", nameVsAgeMap);
+	}
+
+	@Test
+	public void convert_students_to_map_of_nameVsAge() {
+		int max = 3;
+		List<Student> students = TestUtil.getStudentSample(max);
+
+		Map<String, Integer> nameVsAgeMap = students
 				.stream()
 				.collect(Collectors.toMap(
 						i1 -> i1.getName(),
 						i2 -> i2.getAge())
 				);
 
-		assertThat(nameVsAgeMap1.size()).isEqualTo(max);
-		log.info("nameVsAgeMap1 : {}", nameVsAgeMap1);
+		assertThat(nameVsAgeMap.size()).isEqualTo(max);
+		log.info("nameVsAgeMap : {}", nameVsAgeMap);
+	}
+
+	@Test
+	public void convert_students_to_map_of_nameVsAge_method_reference() {
+		int max = 3;
+		List<Student> students = TestUtil.getStudentSample(max);
 
 		//method reference
-		Map<String, Integer> nameVsAgeMap2 = students
+		Map<String, Integer> nameVsAgeMap = students
 				.stream()
 				.collect(Collectors.toMap(
 						Student::getName,
 						Student::getAge)
 				);
 
-		assertThat(nameVsAgeMap2.size()).isEqualTo(max);
-
+		assertThat(nameVsAgeMap.size()).isEqualTo(max);
 	}
 
 	@Test
-	public void convert_students_to_map2() {
+	public void convert_students_to_map_of_idVsStudent() {
 		int max = 3;
 		List<Student> students = TestUtil.getStudentSample(max);
 
-		Map<Integer, Student> nameVsAgeMap1 = IntStream.range(0, max).boxed()
+		Map<Integer, Student> idVsStudentMap = IntStream.range(0, max).boxed()
 				.collect(Collectors.toMap(
 						i1 -> i1 + 1,
 						i2 -> students.get(i2)
 				));
 
-		nameVsAgeMap1.forEach((it, it2) -> log.info("{}", it));
+		idVsStudentMap.forEach((it, it2) -> log.info("{}", it));
 
-		assertThat(nameVsAgeMap1.size()).isEqualTo(max);
+		assertThat(idVsStudentMap.size()).isEqualTo(max);
 
 	}
 
