java - java中从文件中删除对象

Question

示例代码:

else if (ninput == 4) {
                    System.out.println("Select a method\n");
                    System.out.println("1) Remove recording by index\n");
                    System.out.println("2) Remove recording by name\n");

                    sinput = scan.next();
                    ninput = Integer.parseInt(sinput);

                    if (ninput == 1) {
                        System.out.println("INDEX ");
                        for (int i = 0; i < Users.get(loginID).User_Playlist.numberOfRecordings; i ++) {
                            System.out.println((i+1)+ ") "+ Users.get(loginID).User_Playlist.recordingList.get(i) +"\n");
                        }   
                        System.out.println("Enter the index of the recording to remove: ");
                        sinput = scan.next();
                        ninput = Integer.parseInt(sinput);
                        Users.get(loginID).User_Playlist.recordingList.remove(ninput - 1);
                        Users.get(loginID).User_Playlist.numberOfRecordings--;

                        System.out.println(Users.get(loginID).User_Playlist.toString());
                    }
                    if (ninput == 2) {
                        for (int i = 0; i < Users.get(loginID).User_Playlist.numberOfRecordings; i ++) {
                            System.out.println((i+1)+ ") "+ Users.get(loginID).User_Playlist.recordingList.get(i) +"\n");
                        }   
                        System.out.println("Enter the name of the recording to remove: ");
                        sinput = scan.next();



                    }

                    }

需要修复的代码:

if (ninput == 2) {
                        for (int i = 0; i < Users.get(loginID).User_Playlist.numberOfRecordings; i ++) {
                            System.out.println((i+1)+ ") "+ Users.get(loginID).User_Playlist.recordingList.get(i) +"\n");
                        }   
                        System.out.println("Enter the name of the recording to remove: ");
                        sinput = scan.next();



                    }

问题:第一种方法根据播放列表中歌曲的索引从播放列表中删除歌曲。第二种不完整的方法是根据歌曲名称从播放列表文件中删除歌曲。有谁知道如何根据对象的名称从文件中删除单个项目？

Answer 1

您获取名称，循环播放所有歌曲，并将获取的名称与每首歌曲的名称进行比较。一旦找到那个，就把它拿出来(你有它的索引 - 它是循环计数器)并跳出循环。这是最基本的方法。