如何根据浮点字段对自定义ArrayList进行排序

Question

我们使用Comparable接口对ArrayList进行排序，但是如何修改Comparable接口的CompareTo函数以基于float字段对ArrayList进行排序，因为函数返回int。

我试图按照用户评分（浮点数据类型）对影片数据进行排序。以下是我创建的类，用于保存通过网络调用通过Json Feed获取的不同值。

/** 
* Created by anant on 2015-08-19. 
*/ 
public class MoviesDetail implements Parcelable, Comparable<MoviesDetail> { 

    private String jsf_original_title; 
    private String jsf_poster; 
    private String jsf_plot_synopsis; 
    private float jsf_user_rating; 
    private String jsf_release_date; 
    private String jsf_results; 
    private int jsf_id; 

    public MoviesDetail() { 

    } 

    private MoviesDetail(Parcel p) { 
     jsf_original_title = p.readString(); 
     jsf_poster = p.readString(); 
     jsf_plot_synopsis = p.readString(); 
     jsf_user_rating = p.readFloat(); 
     jsf_release_date = p.readString(); 
     jsf_results = p.readString(); 
     jsf_id = p.readInt(); 

    } 

    public String getJsf_original_title() { 
     return jsf_original_title; 
    } 

    public String getJsf_poster() { 
     return jsf_poster; 
    } 

    public String getJsf_plot_synopsis() { 
     return jsf_plot_synopsis; 
    } 

    public float getJsf_user_rating() { 
     return jsf_user_rating; 
    } 

    public String getJsf_release_date() { 
     return jsf_release_date; 
    } 

    public String getJsf_results() { 
     return jsf_results; 
    } 

    public int getJsf_id() { 
     return jsf_id; 
    } 

    public void setJsf_original_title(String jsf_original_title) { 
     this.jsf_original_title = jsf_original_title; 
    } 

    public void setJsf_poster(String jsf_poster) { 
     this.jsf_poster = jsf_poster; 
    } 

    public void setJsf_plot_synopsis(String jsf_plot_synopsis) { 
     this.jsf_plot_synopsis = jsf_plot_synopsis; 
    } 

    public void setJsf_user_rating(float jsf_user_rating) { 
     this.jsf_user_rating = jsf_user_rating; 
    } 

    public void setJsf_release_date(String jsf_release_date) { 
     this.jsf_release_date = jsf_release_date; 
    } 

    public void setJsf_results(String jsf_results) { 
     this.jsf_results = jsf_results; 
    } 

    public void setJsf_id(int jsf_id) { 
     this.jsf_id = jsf_id; 
    } 

    @Override 
    public int describeContents() { 
     return 0; 
    } 

    @Override 
    public void writeToParcel(Parcel dest, int flags) { 

     dest.writeString(jsf_original_title); 
     dest.writeString(jsf_poster); 
     dest.writeString(jsf_plot_synopsis); 
     dest.writeFloat(jsf_user_rating); 
     dest.writeString(jsf_release_date); 
     dest.writeString(jsf_results); 
     dest.writeInt(jsf_id); 

    } 

    public final Parcelable.Creator<MoviesDetail> CREATOR = new Parcelable.Creator<MoviesDetail>() { 

     /** 
     * Create a new instance of the Parcelable class, instantiating it 
     * from the given Parcel whose data had previously been written by 
     * {@link Parcelable#writeToParcel Parcelable.writeToParcel()}. 
     * 
     * @param source The Parcel to read the object's data from. 
     * @return Returns a new instance of the Parcelable class. 
     */ 
     @Override 
     public MoviesDetail createFromParcel(Parcel source) { 
     return new MoviesDetail(source); 

     } 

     /** 
     * Create a new array of the Parcelable class. 
     * 
     * @param size Size of the array. 
     * @return Returns an array of the Parcelable class, with every entry 
     * initialized to null. 
     */ 
     @Override 
     public MoviesDetail[] newArray(int size) { 
     return new MoviesDetail[0]; 
     } 
    }; 

    @Override 
    public int compareTo(MoviesDetail aMovie) { 

     int i = (int) aMovie.getJsf_user_rating(); 
     return getJsf_user_rating().compareTo(i); 
    } 
} 

Answer 1

谢谢萨利文！此外，我试图做下面的似乎它确实工作了。 让我知道是否有关于下面的任何额外的意见

public int compareTo(MoviesDetail aMovie) { 

    // int i = (int)another.getJsf_user_rating(); 
    if(aMovie.getJsf_user_rating()<this.getJsf_user_rating()){ 
     return -1; 
    } 

    else if(aMovie.getJsf_user_rating()==this.getJsf_user_rating()){ 
     return 0; 
    } 

     return 1; 

}