오브젝트 arrylist의 정렬 요소에 비교 사용하기

Question

자바 프로그램을 사용하여 비행 세부 사항을 추가했으며 비교자를 사용하여 비행 이름을 기준으로 정렬 작업을 수행하려고합니다. 하지만이 줄에 Flight.java에서 컴파일 오류가 발생합니다 .... Collections.sort (flightObject, new Compareid());

package com.flight; 


import java.util.*; 

public class Flight 
{ 
    public String flightName; 
    public String source; 
    public String destination; 
    public int flightId; 
    public int flightFare; 


    public Flight(String flightName,int flightId,String source, String destination, int flightFare) 
    { 
      super(); 
      this.flightName = flightName; 
      this.source = source; 
      this.destination = destination; 
      this.flightId = flightId; 
      this.flightFare = flightFare; 
    } 

    public String getFlightName() 
    { 
     return flightName; 
    } 
    public int getFlightId() 
    { 
     return flightId; 
    } 
    public String getSource() { 
     return source; 
    } 
    public String getDestination() { 
     return destination; 
    } 

    public int getFlightFare() { 
      return flightFare; 
    } 

    public boolean searchFlight(int originalFlightId, int newFlightId) 
    { 
     if(originalFlightId==newFlightId) 
     { 
      return true; 
     } 
     else 
     { 
      return false; 
     } 

    } 


    class Compareid implements Comparator<Flight>{ 

     public int compare(Flight flightObject1,Flight flightObject2){ 
      return (flightObject1.flightName.compareTo (flightObject2.flightName)); 
     } 

    } 
} 

이 메인 클래스입니다 .............

package com.main; 

import com.flight.*; 

import java.util.*; 

public class HighFly 
{ 

    public static void main(String[] args) 
    { 

     Flight indigo=new Flight("Indigo",1000,"Trivandrum","Dubai",25000); 
     Flight emirates=new Flight("Emirates",1001,"Dehi","US",30000); 
     Flight airindia=new Flight("Air India",1002,"Kochi","Malaysia",29000); 

     ArrayList<Flight>flightList=new ArrayList<Flight>(); 
     flightList.add(indigo); 
     flightList.add(emirates); 
     flightList.add(airindia); 

     System.out.println("FlightId  FlightName   Source   Destination  Fare"); 
      for(Flight flightObject:flightList) 
      { 
       System.out.print(flightObject.getFlightId()); 
       System.out.print("\t\t"+flightObject.getFlightName()); 
       System.out.print("\t\t"+flightObject.getSource()); 
       System.out.print("\t\t"+flightObject.getDestination()); 
       System.out.println("\t\t"+flightObject.getFlightFare()); 
      } 

      //SEARCHING FLIGHT EXISTS 
      System.out.println("Enter flight id"); 
      Scanner scanner= new Scanner(System.in); 
      int checkFlightId=scanner.nextInt(); 
      for(Flight flightObject:flightList) 
      { 
       if(flightObject.searchFlight(flightObject.flightId,checkFlightId)) 
       { 
        System.out.println("Success"); 

       } 
       else 
       { 
        System.out.println("Not success"); 

       } 
      } 

      //*********sorting*********** 
      for(Flight flightObject:flightList) 
      { 
      Collections.sort(flightObject,new Compareid()); 
      } 


      System.out.println("  after sorting  "); 
      System.out.println("FlightId  FlightName   Source   Destination  Fare"); 
      for(Flight flightObject:flightList) 
      { 
       System.out.print(flightObject.getFlightId()); 
       System.out.print("\t\t"+flightObject.getFlightName()); 
       System.out.print("\t\t"+flightObject.getSource()); 
       System.out.print("\t\t"+flightObject.getDestination()); 
       System.out.println("\t\t"+flightObject.getFlightFare()); 
      } 



    } 



} 

날이 문제를 해결하는 데 도움이됩니다. 나는 arraylist에서 이것을 구현하고 싶다. 다음 코드에서 오류를 찾으십시오.

Answer 1

는 (새로운 Compareid() flightList) 비행 클래스

import java.util.Comparator; 

    class Compareid implements Comparator<Flight> { 
     public int compare(Flight flightObject1, Flight flightObject2) { 
      return (flightObject1.flightName.compareTo(flightObject2.flightName)); 

     } 
    } 

은, Collections.sort에서 비교기를 이전; // 개별 객체 대신 목록을 전달해야하는 경우 아래의 HighFly 클래스를 참조하십시오.

import java.util.*; 

public class HighFly { 

    public static void main(String[] args) { 

     Flight indigo = new Flight("Indigo", 1000, "Trivandrum", "Dubai", 25000); 
     Flight emirates = new Flight("Emirates", 1001, "Dehi", "US", 30000); 
     Flight airindia = new Flight("Air India", 1002, "Kochi", "Malaysia", 
       29000); 

     ArrayList<Flight> flightList = new ArrayList<Flight>(); 
     flightList.add(indigo); 
     flightList.add(emirates); 
     flightList.add(airindia); 

     System.out 
       .println("FlightId  FlightName   Source   Destination  Fare"); 
     for (Flight flightObject : flightList) { 
      System.out.print(flightObject.getFlightId()); 
      System.out.print("\t\t" + flightObject.getFlightName()); 
      System.out.print("\t\t" + flightObject.getSource()); 
      System.out.print("\t\t" + flightObject.getDestination()); 
      System.out.println("\t\t" + flightObject.getFlightFare()); 
     } 

     // SEARCHING FLIGHT EXISTS 
     System.out.println("Enter flight id"); 
     Scanner scanner = new Scanner(System.in); 
     int checkFlightId = scanner.nextInt(); 
     for (Flight flightObject : flightList) { 
      if (flightObject.searchFlight(flightObject.flightId, checkFlightId)) { 
       System.out.println("Success"); 

      } else { 
       System.out.println("Not success"); 

      } 
     } 

     // *********sorting*********** 
    for (Flight flightObject : flightList) { 
      Collections.sort(flightList, new Compareid()); 
    } 

     System.out.println("  after sorting  "); 
     System.out 
       .println("FlightId  FlightName   Source   Destination  Fare"); 
     for (Flight flightObject : flightList) { 
      System.out.print(flightObject.getFlightId()); 
      System.out.print("\t\t" + flightObject.getFlightName()); 
      System.out.print("\t\t" + flightObject.getSource()); 
      System.out.print("\t\t" + flightObject.getDestination()); 
      System.out.println("\t\t" + flightObject.getFlightFare()); 
     } 

    } 

} 

그리고 업데이트 된 fligh 클래스는

public class Flight { 
    public String flightName; 
    public String source; 
    public String destination; 
    public int flightId; 
    public int flightFare; 

    public Flight(String flightName, int flightId, String source, 
      String destination, int flightFare) { 
     super(); 
     this.flightName = flightName; 
     this.source = source; 
     this.destination = destination; 
     this.flightId = flightId; 
     this.flightFare = flightFare; 
    } 

    public String getFlightName() { 
     return flightName; 
    } 

    public int getFlightId() { 
     return flightId; 
    } 

    public String getSource() { 
     return source; 
    } 

    public String getDestination() { 
     return destination; 
    } 

    public int getFlightFare() { 
     return flightFare; 
    } 

    public boolean searchFlight(int originalFlightId, int newFlightId) { 
     if (originalFlightId == newFlightId) 

     { 
      return true; 
     } else { 
      return false; 
     } 

    } 
}