ssd3 practical quiz7答案

import java.io.*; import java.util.*; /** * Test the class <code>StudentArrayList</code> * * @author iCarnegie * @version 1.0.0 * @see Student * @see StudentArrayList */ public class TestStudentArrayList { /* Standard output stream */ private static PrintWriter stdOut = new PrintWriter(System.out, true); /* Standard error stream */ private static PrintWriter stdErr = new PrintWriter(System.err, true); /* Variables that contains the test objects */ private Student first; private Student second; private Student third; private Student fourth; private Student fifth; private Student firstArrayListTwo; private Student secondArrayListTwo; private Student thirdArrayListTwo; private Student fourthArrayListTwo; private Student fifthArrayListTwo; private ArrayList<Student> emptyArrayList; private ArrayList<Student> arrayList; private ArrayList<Student> arrayListTwo; /** * Tests methods of class {@link StudentArrayList} * * @param args not used */ public static void main (String args[]) { stdOut.println(""); stdOut.println("Testing class StudentArrayList..."); TestStudentArrayList tester = new TestStudentArrayList(); if (tester.testMakeArrayList() & tester.testMakeArrayListFromArray() & tester.testHasStudent() & tester.testCountGradeGreaterOrEqual() & tester.testGetMinGrade() & tester.testGetGradeAverage() & tester.testRemoveGradeLess() & tester.testDisplayAll()) { stdOut.println("All tests passed"); } } /** * Displays a message in the standard error stream if the value specified * by parameter <code>condition<code> is <code>false</code>. * * @param message the error message. * @param condition the test condition. * @return the value of <code>condition</code> */ public static boolean assertTrue(String message, boolean condition) { if (! condition) { stdErr.print("** Test failure "); stdErr.println(message); return false; } else { return true; } } /** * Displays a message in the standard error stream. * * @param message the error message. * @return false */ public static boolean fail(String message) { stdErr.print("** Test failure "); stdErr.println(message); return false; } /** Assign the initial value to the test variables */ private void setUp() { first = new Student(10, "First", 100); second = new Student(20, "Second", 90); third = new Student(30, "Third", 80); fourth = new Student(40, "Fourth", 90); firstArrayListTwo = new Student(10, "First", 50); secondArrayListTwo = new Student(20, "Second", 90); thirdArrayListTwo = new Student(30, "Third", 80); fourthArrayListTwo = new Student(40, "Fourth", 80); fifthArrayListTwo = new Student(50, "Fifth", 90); emptyArrayList = new ArrayList<Student>(); arrayList = new ArrayList<Student>(); arrayList.add(first); arrayList.add(second); arrayList.add(third); arrayList.add(fourth); arrayListTwo = new ArrayList<Student>(); arrayListTwo.add(firstArrayListTwo); arrayListTwo.add(secondArrayListTwo); arrayListTwo.add(thirdArrayListTwo); arrayListTwo.add(fourthArrayListTwo); arrayListTwo.add(fifthArrayListTwo); } /** * Test the method <code>makeArrayList3</code> * * @return <code>true</code> if all test passed; otherwise returns * <code>false</code>. */ public boolean testMakeArrayList() { setUp(); boolean test = true; ArrayList<Student> result = StudentArrayList.makeArrayList(first, second, third); test = test && assertTrue("1, testing method makeArrayList", result instanceof ArrayList); test = test && assertTrue("2, testing method makeArrayList", result.size() == 3); test = test && assertTrue("3, testing method makeArrayList", result.get(0) == first); test = test && assertTrue("4, testing method makeArrayList", result.get(1) == second); test = test && assertTrue("5, testing method makeArrayList", result.get(2) == third); return test; } /** * Test the method <code>makeArrayListFromArray</code> * * @return <code>true</code> if all test passed; otherwise returns * <code>false</code>. */ public boolean testMakeArrayListFromArray() { setUp(); boolean test = true; ArrayList<Student> listFromEmptyArray = StudentArrayList.makeArrayListFromArray(new Student[0]); test = test && assertTrue("1, testing method makeArrayListFromArray", listFromEmptyArray instanceof ArrayList); test = test && assertTrue("2, testing method makeArrayListFromArray", listFromEmptyArray.size() == 0); Student array[] = {first, second, third}; ArrayList<Student> result = StudentArrayList.makeArrayListFromArray(array); test = test && assertTrue("3, testing method makeArrayListFromArray", result instanceof ArrayList); test = test && assertTrue("4, testing method makeArrayListFromArray", result.size() == 3); test = test && assertTrue("5, testing method makeArrayListFromArray", result.get(0) == first); test = test && assertTrue("6, testing method makeArrayListFromArray", result.get(1) == second); test = test && assertTrue("7, testing method makeArrayListFromArray", result.get(2) == third); return test; } /** * Test the method <code>hasStudent</code>. * * @return <code>true</code> if all test passed; otherwise returns * <code>false</code>. */ public boolean testHasStudent() { setUp(); boolean test = true; test = test && assertTrue("1, testing method hasStudent", ! StudentArrayList.hasStudent(emptyArrayList, first.getId())); test = test && assertTrue("2, testing method hasStudent", StudentArrayList.hasStudent(arrayList, first.getId())); test = test && assertTrue("3, testing method hasStudent", StudentArrayList.hasStudent(arrayList, second.getId())); test = test && assertTrue("4, testing method hasStudent", StudentArrayList.hasStudent(arrayList, third.getId())); test = test && assertTrue("5, testing method hasStudent", StudentArrayList.hasStudent(arrayList, fourth.getId())); test = test && assertTrue("6, testing method hasStudent", ! StudentArrayList.hasStudent(arrayList, 555)); return test; } /** * Test the method <code>countGradeGreaterOrEqual</code>. * * @return <code>true</code> if all test passed; otherwise returns * <code>false</code>. */ public boolean testCountGradeGreaterOrEqual() { setUp(); boolean test = true; test = test && assertTrue("1, testing method countGradeGreaterOrEqual", StudentArrayList.countGradeGreaterOrEqual(arrayList, 50) == 4); test = test && assertTrue("2, testing method countGradeGreaterOrEqual", StudentArrayList.countGradeGreaterOrEqual(arrayList, 100) == 1); return test; } /** * Test the method <code>getMinGrade</code>. * * @return <code>true</code> if test passed; otherwise returns * <code>false</code>. */ public boolean testGetMinGrade() { setUp(); boolean test = true; test = test && assertTrue("1, testing method getMinGrade", StudentArrayList.getMinGrade(arrayList) == 80); test = test && assertTrue("2, testing method getMinGrade", StudentArrayList.getMinGrade(arrayListTwo) == 50); return test; } /** * Test the method <code>getGradeAverage</code>. * * @return <code>true</code> if test passed; otherwise returns * <code>false</code>. */ public boolean testGetGradeAverage() { setUp(); return assertTrue("1, testing method getGradeAverage", StudentArrayList.getGradeAverage(arrayList) == (first.getGrade() + second.getGrade() + third.getGrade() + fourth.getGrade()) / 4.0); } /** * Test the method <code>removeGrad