Song オブジェクトの配列を作成しました。曲には、変数 title、author、interpreter、(int)yearReleased、album、および fileName が含まれます。メイン メソッドを使用して、曲の配列と equals メソッドをテストしています。このテストでは、配列に 5 つの曲オブジェクトを入力し、equals メソッドを使用して、新しいエントリが以前のエントリと重複していないことを確認する必要があります。テスト クラスはコンパイルされますが、重複する曲情報を入力するとエラーが発生し続けます。誰かが私にヒントを与えたり、正しい方向に私を向けることができれば、私はそれを大いに感謝します. 他のヒントも素晴らしいでしょう。学生として、専門家から実際のアドバイスを聞くことは素晴らしいことです。
import java.util.Scanner;
public class Test{
public static void main(String[] args)
{
Scanner kybd = new Scanner(System.in);
Song[] songTest = new Song[5];
boolean match;
int count = 0;
System.out.println("Enter 5 songs\n");
for(Song x:songTest)
{
do{
match = false;
x = new Song();
System.out.print("Title: ");
x.setTitle(kybd.nextLine());
System.out.print("Author: ");
x.setAuthor(kybd.nextLine());
System.out.print("Interpreter: ");
x.setInterpreter(kybd.nextLine());
System.out.print("Year released: ");
x.setYearReleased(kybd.nextInt());
kybd.nextLine();
System.out.print("Album: ");
x.setAlbum(kybd.nextLine());
System.out.print("File name: ");
x.setFileName(kybd.nextLine());
System.out.print(x);
System.out.println();
for(int i = 0; i<count; i++)
if(songTest[i].equals(x)){
match = true;
System.out.print("Duplicate");
}
}while(match);
count++;
}
}
}
public class Song
{
public String title;
public String author;
public String interpreter;
public int yearReleased;
public String album;
public String fileName;
//private vars
private int reviewScore = 0;
private int reviews = 0;
private double average;
//Mutator methods
public void setTitle(String t)
{
this.title = t;
}
public void setAuthor(String a)
{
this.author = a;
}
public void setInterpreter(String i)
{
this.interpreter = i;
}
public void setYearReleased(int y)
{
if (y>0)
this.yearReleased = y;
else
{
System.out.print ("This song is not that old");
this.yearReleased = -5;
}
}
public void setAlbum(String a)
{
this.album = a;
}
public void setFileName(String f)
{
this.fileName = f;
}
public void addReviewScore(int s)
{
if (s>0 && s<6)
{
this.reviewScore += s;
this.reviews++;
}
else
System.out.print("This is not a valid review score!");
}
//Accessor methods
public String getTitle()
{
return this.title;
}
public String getAuthor()
{
return this.author;
}
public String getInterpreter()
{
return this.interpreter;
}
public int getYearReleased()
{
return this.yearReleased;
}
public String getAlbum()
{
return this.album;
}
public String getFileName()
{
return this.fileName;
}
public double getAverage()
{
this.average = this.calculateAverage();
return this.average;
}
//Methods
public boolean equals(Song otherSong)
{
boolean isEqual = false;
//compare this song to the otherSong
isEqual =
this.title == otherSong.title &&
this.author == otherSong.author &&
this.interpreter == otherSong.interpreter &&
this.yearReleased == otherSong.yearReleased &&
this.album == otherSong.album &&
this.fileName == otherSong.fileName;
return isEqual;
}
public String toString()
{
String songInfo;
songInfo =
"***Song information***\n" +
"Title: " + this.title +
"\nAuthor: " + this.author +
"\nInterpreter: " + this.interpreter +
"\nYear Released: " + this.yearReleased +
"\nAlbum: " + this.album +
"\nFile name: " + this.fileName +
"\nYears old: " + this.yearsOld();
return songInfo;
}
public int yearsOld()
{
int yearsOld = (2012 - this.yearReleased);
return yearsOld;
}
//Private methods
private double calculateAverage()
{
this.average = ((double)this.reviewScore/(double)this.reviews);
return this.average;
}
}