java - 稳定排序java按字母顺序排列数组

Question

我第一次尝试运行稳定排序。我创建了一个包含学生对象的数组。现在我想按照名称的字母顺序对该数组中的这些对象进行排序。我不明白的是 Arrays.sort(student,new Students());如果有的话，它的论点应该是什么。非常感谢!

import java.util.Comparator;
import java.util.Arrays;

public class Students implements Comparable<Students> {
private String FirstName;
private String lastName;
private int age;


public Students(String firstName, String lastName, int age) {
    super();
    FirstName = firstName;
    this.lastName = lastName;
    this.age = age;
}


public String getFirstName() {
    return FirstName;
}


public void setFirstName(String firstName) {
    FirstName = firstName;
}


public String getLastName() {
    return lastName;
}


public void setLastName(String lastName) {
    this.lastName = lastName;
}


public int getAge() {
    return age;
}


public void setAge(int age) {
    this.age = age;
}
@Override
public int compareTo(Students toCheck) {
    int compareQuantity = ((Students)toCheck).getAge();

    return this.age-compareQuantity;
}



public static void main(String args[]){
    //array for the 6 students 
    Students[] student= new Students[6] ;
    //creating and adding one by one
    Students sam = new Students("Sam","Wo", 22 );
    student[0]=sam;
    Students ben = new Students("Ben","Wang", 27 );
    student[1]=ben;
    Students arsalan = new Students("Arsalan","Khan", 28);
    student[2]=arsalan;
    Students issa = new Students("Issa","Hashim", 25 );
    student[3]=issa;
    //ben khan will test if the last name is different. Should be fun .
    Students benK = new Students("Ben","Khan", 29 );
    student[4]=benK;
    Students jackM = new Students("Jack","Meth", 23);
    student[5]=jackM;

    Comparator <Students> studentCompare = new Comparator<Students>(){

    public int compare (Students s1 , Students s2){
        String studentName1 = s1.getFirstName();
        String studentName2 = s2.getFirstName();
        return studentName1.compareTo(studentName2);

        Arrays.sort(student,new Students());

    }

}； 为(int i = 0;我

Answer 1

您的 main() 中不需要比较器，因此您可以如下更改 main() 以使其正常工作:

    public static void main(String args[]) {
    //array for the 6 students
    Students[] student = new Students[6];
    //creating and adding one by one
    Students sam = new Students("Sam", "Wo", 22);
    student[0] = sam;
    Students ben = new Students("Ben", "Wang", 27);
    student[1] = ben;
    Students arsalan = new Students("Arsalan", "Khan", 28);
    student[2] = arsalan;
    Students issa = new Students("Issa", "Hashim", 25);
    student[3] = issa;
    //ben khan will test if the last name is different. Should be fun .
    Students benK = new Students("Ben", "Khan", 29);
    student[4] = benK;
    Students jackM = new Students("Jack", "Meth", 23);
    student[5] = jackM;

    Arrays.sort(student);

}