请问我能得到一些帮助吗？我不知道如何让我的 If 语句搜索学生工作。我收到一个错误：
incompatible types
found : Student
required: boolean
if (search(name, students))
另外，我对如何实现冒泡排序一无所知。
public class StudentProcessor2 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
// read in how many students to process
System.out.print("How many students?");
int numStudents = input.nextInt();
Student[] students = new Student[numStudents];
for (int i = 0; i < numStudents; i++) {
// read in student data from Scanner
System.out.println("What is the students name?");
String name = input.next();
System.out.println("What is the students grade?");
// System.out.println("***Type -1 if no more grades***");
int grade = input.nextInt();
Student student = new Student();
student.setName(name);
student.setGrade(grade);
students[i] = student;
}
UserSelection(input, numStudents, students);
}
// show menu with options
public static void UserSelection(Scanner input, int numStudents,
Student[] students) {
// Repeatedly process menu selections by the user.
int choice;
do {
System.out.println();
System.out.println("*** Student Exam Results Menu ***");
System.out.println("(1) Display the results");
System.out.println("(2) Display the average result");
System.out.println("(3) Display the highest grade");
System.out.println("(4) Display the lowest grade");
System.out.println("(5) Search for specific result");
System.out.println("(6) Search for student grade by name");
System.out.println("(7) Sort the results in ascending order");
System.out.println("(8) quit");
choice = input.nextInt();
if (choice == 1)
{
System.out.println(Arrays.toString(students));
} else if (choice == 2)
{
double average = getAverage(students);
System.out.println("average grade = " + average);
} else if (choice == 3)
{
int high = getHighest(students);
System.out.println("high grade = " + high);
} else if (choice == 4)
{
int low = getLowest(students);
System.out.println("low grade = " + low);
} else if (choice == 5)
{
System.out.print("Result to look for: ");
int grade = input.nextInt();
if (result(grade, students)) {
System.out.println(grade +
" is in the collection of grades.");
} else
{
System.out.println(grade +
" is not in the collection of grades.");
}
} else if (choice == 6)
{
System.out.print("Student to search for: ");
String name = input.nextLine();
if (search(name, students))
{
System.out.println(name +
" is in the list of Students.");
} else
{
System.out.println(name +
" is not in the list of Students");
}
}
} while (choice != 8);
}
// get Lower Grade
private static int getLowest(Student[] students) {
int lowest = 100;
Student result = null;
for (Student student : students) {
if (student.getGrade() < lowest) {
lowest = student.getGrade();
result = student;
}
}
return result.getGrade();
}
// get Highest grade
private static int getHighest(Student[] students) {
int highest = 0;
Student result = null;
for (Student student : students) {
if (student.getGrade() > highest) {
highest = student.getGrade();
result = student;
}
}
return result.getGrade();
}
// get Average grade
private static double getAverage(Student[] students) {
int total = 0;
for (Student student : students) {
total += student.getGrade();
}
return total / students.length;
}
// Search for student
private static Student search(String name, Student[] students) {
Student result = null;
for (Student student : students) {
if (student.getName().equalsIgnoreCase(name)) {
result = student;
break;
}
}
return result;
}
// Search for grade
private static boolean result(int grade, Student[] students) {
for (Student student : students) {
if (student.getGrade() == grade) {
return true;
}
}
return false;
}
// !Bubble sort goes here!
private void sort(Student[] students) {
Student hold; // temporary holding area for swap
for (int i = 0; i < students.length; i++) { // passes
Student current = students[i];
Student next = students[i + 1];
if (current.getGrade() > next.getGrade()) // one comparison
{
hold = students[i]; // one swap
students[i] = students[i + 1];
students[i + 1] = hold;
}
}
}
}