Attempt#1

.classpath

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" output="target/classes" path="src/main/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" output="target/test-classes" path="src/test/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+			<attribute name="test" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" path="target/generated-sources/annotations">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+			<attribute name="ignore_optional_problems" value="true"/>
+			<attribute name="m2e-apt" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" output="target/test-classes" path="target/generated-test-sources/test-annotations">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+			<attribute name="ignore_optional_problems" value="true"/>
+			<attribute name="m2e-apt" value="true"/>
+			<attribute name="test" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="output" path="target/classes"/>
+</classpath>

.project

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>java-lab01</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.m2e.core.maven2Builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>org.eclipse.m2e.core.maven2Nature</nature>
+	</natures>
+</projectDescription>

.settings/org.eclipse.jdt.apt.core.prefs

@@ -0,0 +1,2 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.apt.aptEnabled=false

.settings/org.eclipse.jdt.core.prefs

@@ -0,0 +1,9 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
+org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=ignore
+org.eclipse.jdt.core.compiler.processAnnotations=disabled
+org.eclipse.jdt.core.compiler.release=disabled
+org.eclipse.jdt.core.compiler.source=1.8

.settings/org.eclipse.m2e.core.prefs

@@ -0,0 +1,4 @@
+activeProfiles=
+eclipse.preferences.version=1
+resolveWorkspaceProjects=true
+version=1

src/main/java/com/kpi/fict/DefaultStudentService.java

@@ -1,9 +1,12 @@
 package com.kpi.fict;
 
+import com.kpi.fict.entities.Exam;
 import com.kpi.fict.entities.Student;
 import com.kpi.fict.repositories.StudentRepository;
 
+import java.util.Collection;
 import java.util.List;
+import java.util.stream.Collectors;
 
 public class DefaultStudentService implements StudentService {
     private StudentRepository studentRepository;
@@ -14,28 +17,72 @@ public DefaultStudentService(StudentRepository studentRepository) {
 
     @Override
     public List<Student> findAllWithRatingLessThan300() {
-        throw new UnsupportedOperationException("Need to make implementation");
+        return studentRepository
+        .findAll()
+        .stream()
+        .filter(s -> s
+                .getExams()
+                .stream()
+                .map(Exam::getScore)
+                .reduce(0.0, Double::sum) < 300)
+        .collect(Collectors.toList());
     }
 
     @Override
     public List<Student> findStudentsWhoTakeMathAndOneMoreExam() {
-        throw new UnsupportedOperationException("Need to make implementation");
+        return studentRepository.findAll().stream().filter(student -> 
+        student
+            .getExams()
+            .stream()
+            .anyMatch(exam -> exam.getType() == Exam.Type.MATH)
+        && 
+        student
+            .getExams()
+            .size() == 2
+    ).collect(Collectors.toList());
     }
 
     @Override
     public List<Student> findStudentsWithRatingMoreThanAvgAndTakeMathExam() {
-        throw new UnsupportedOperationException("Need to make implementation");
+        double avgRating = studentRepository
+        .findAll()
+        .stream()
+        .mapToDouble(Student::getRating)
+        .average()
+        .orElse(0.0);
+
+return studentRepository
+        .findAll()
+        .stream()
+        .filter(s -> s.getRating() > avgRating && s
+                .getExams()
+                .stream()
+                .anyMatch(e -> e.getType() == Exam.Type.MATH))
+        .collect(Collectors.toList());
     }
 
     @Override
     public List<Student> findStudentsWithoutExams() {
-        throw new UnsupportedOperationException("Need to make implementation");
+        return studentRepository
+        .findAll()
+        .stream()
+        .filter(s -> s.getExams().size() == 0)
+        .collect(Collectors.toList());
     }
 
     //Delimiter: ','
     @Override
     public List<String> calculateAvgRatingForEachStudent() {
-        throw new UnsupportedOperationException("Need to make implementation");
+        return studentRepository
+        .findAll()
+        .stream()
+        .map(s -> s.getName() + "," + s
+                .getExams()
+                .stream()
+                .mapToDouble(Exam::getScore)
+                .average()
+                .orElse(0.0))
+        .collect(Collectors.toList());
     }
 
     public StudentRepository getStudentRepository() {