CODEWITHSUNDEEP
javagenericsarraylist
Greg Artisi
Greg Artisi

Reputation: 172

arraylist undefined method for type

I have a method which takes an ArrayList<Song> as argument. the class song has different methods like getTitle(), getInterpret(), toString(), toString2()...

public class Song implements Comparable<Song>{

    private String title;
    private String interpret;
    
    public Song(String title,String interpret){
        
        this.title=title;
        this.interpret=interpret;
        
    }

    public String getTitle() {
        return title;
    }

    public String getInterpret() {
        return interpret;
    }

    
    public String toString2(){
        return title+" - "+interpret;
    }

    @Override
    public int compareTo(Song otherSong) {
        
        return title.compareToIgnoreCase(otherSong.getTitle());
    }

    public String toString() {
        
        return interpret+" - "+title;
    }

}

the method printList takes an ArrayList of Song as argument:

public <Song> void printList(ArrayList<Song> songList,String sortBy){
    
    JLabel track;
            
    for(int i=0;i<songList.size();i++){

        if(sortBy=="Artist"){
        track = new JLabel("\n- "+songList.get(i).toString());}

        else if(sortBy=="Song"){
        track = new JLabel("\n- "+songList.get(i).toString2());}
        
    }

I have an error on songList.get(i).toString2(), the method toString2() is undefined for type Song, it seems like I can only access to the method of the class Object.

Can somebody help please?

Upvotes: 0

Views: 484

Answers (1)

JB Nizet
JB Nizet

Reputation: 691765

You've made your method generic, and chose to name the generic type Song. It shouldn't be generic:

public void printList(ArrayList<Song> songList,String sortBy){

Also, compare strings with equals(), not ==.

Upvotes: 3

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