我正在嘗試按特定屬性（“程序”的“學(xué)生”對(duì)象和“教師”的“教授”對(duì)象）對(duì)兩個(gè)不同的對(duì)象數(shù)組列表進(jìn)行排序。這兩個(gè)類(lèi)都擴(kuò)展了我的抽象“人”類(lèi)。public abstract class Person implements Comparable<Person>{ private String name; private String adress; //getters, setters, etc., all works properly @Override protected Object clone() throws CloneNotSupportedException { return super.clone(); } public int compareTo(String string) { return name.compareTo(string); }}然后，當(dāng)我創(chuàng)建一個(gè)由 1000000 個(gè)隨機(jī)“人”對(duì)象組成的數(shù)組時(shí)，可以是學(xué)生或教授，我決定像這樣按他們的名字按字母順序排序（這可以正常工作）。Person personByName[] = arrayPersonas.clone();Arrays.sort(personByName);然后，我將原始 Person 數(shù)組劃分為兩個(gè) ArrayList，一個(gè)用于 Student 對(duì)象，另一個(gè)用于教授對(duì)象： ArrayList<Student> studentsByProgram = new ArrayList(); ArrayList<Professor> professorsByFaculty = new ArrayList(); for (int i = 0; i < 1000000; i++) { if (arrayPersonas[i] instanceof Student) { studentsByProgram.add((Student)arrayPersonas[i]); } else { professorsByFaculty.add((Professor)arrayPersonas[i]); } }當(dāng)我嘗試按我想要的屬性按字母順序?qū)γ總€(gè) ArrayList 進(jìn)行排序時(shí)，問(wèn)題就出現(xiàn)了，因?yàn)樗恢卑?Person 的名稱(chēng)對(duì)它們進(jìn)行排序：Collections.sort(studentsByProgram);Collections.sort(professorsByFaculty);在這里，我離開(kāi)我的學(xué)生和教授課程：public class Student extends Person { private String program; private int year; private double fee; //constructor, setters, getters, toString, equals @Override protected Object clone() throws CloneNotSupportedException { return super.clone(); } public int compareTo(String string) { return program.compareTo(string); } @Override public int compareTo(Person t) { return super.compareTo(t.getName()); }}教授班：public class Professor extends Person { private String faculty; private double salary; //constructor, setters, getters, toString, equals @Override protected Object clone() throws CloneNotSupportedException { return super.clone(); } public int compareTo(String string) { return faculty.compareTo(string); }
Java Collections.sort() 未按預(yù)期排序
滄海一幻覺(jué)
2021-10-20 16:04:29
