Java Comparator类对特定对象数组进行排序
我有一个float数组和一个String数组。 每个浮点值与特定字符串匹配。 我想使用以下方法对float数组进行排序以保留自己的字符串：
public static void sort(T[] a,Comparator c) 这是代码：
public class ResultVoiceObject { private String frase; private float ranking; public ResultVoiceObject(String f, float r) { this.frase=f; this.ranking= r; } } public class VoiceRecognitionDemo extends Activity { // Populate the wordsList with the String values the recognition engine thought it heard ArrayList matches = data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS); //il Ranking float[] score= data.getFloatArrayExtra(RecognizerIntent.EXTRA_CONFIDENCE_SCORES); ResultVoiceObject[] risultati= new ResultVoiceObject[score.length]; for (i=0; i<risultati.length;i++) { risultati[i]=new ResultVoiceObject(matches.get(i), score[i]); } ResultVoiceObject[] risultatiDaOrdinare= risultati; // risultati contais ResultVoiceObject elements /*sorting*/ }
如何按排名和保留自己的字符串进行排序？
非常感谢。
ResultVoiceObject[] objects = ... Arrays.sort(objects, new Comparator() { @Override public int compare(ResultVoiceObject arg0, ResultVoiceObject arg1) { return Float.compare(arg0.getRanking(), arg1.getRanking()); } });
假设您有一个私有字段ranking的getRanking()访问器。
public class ResultComparator implements Comparator { public int compare(ResultVoiceObject r1, ResultVoiceObject r2) { float f1 = r1.getRanking(); float f2 = r2.getRanking(); if(f1 > f2) return 1; else if(f1 < f2) return -1; return 0; } } Arrays.sort(resultsArray, new ResultComparator());
您需要实现Comparator接口。 您可以在使用Comparator创建多个排序顺序。
假设您要根据排名对数组进行排序，然后创建一个实现Comparator的单独类
public Class RankingSorter implements Comparator { public int compare(ResultVoiceObject one, ResultVoiceObject another){ return (int)(one.getRanking() - another.getRanking()); } }
然后在要对数组进行排序的新类中，创建comparator的对象并将其传递给集合
RankingSorter rs = new RankingSorter(); Collections.sort(yourArray, rs);
这是带有comparator的sort方法的重载版本。
我刚刚写了一篇关于这个的完整教程http://www.dreamincode.net/forums/topic/174322-the-comparable-and-comparator-interface-part-ii/
这是ResultVoicObject类
package com.compare; public class ResultVoiceObject { private String frase; private float ranking; public ResultVoiceObject(String f, float r) { this.frase = f; this.ranking = r; } public String getFrase() { return frase; } public void setFrase(String frase) { this.frase = frase; } public float getRanking() { return ranking; } public void setRanking(float ranking) { this.ranking = ranking; } @Override public String toString() { return "ResultVoiceObject [frase=" + frase + ", ranking=" + ranking + "]"; } }
如下实现Comparator接口，需要实现compare方法
package com.compare; import java.util.Comparator; public class RankingSort implements Comparator { public int compare(ResultVoiceObject one, ResultVoiceObject another){ return (int) (one.getRanking() - another.getRanking()); } }
你可以测试它如下。
package com.compare; import java.util.ArrayList; import java.util.Collections; public class RankingSorterTest{ public static void main(String [] args){ ArrayList list = new ArrayList (); list.add(new ResultVoiceObject("one", 1)); list.add(new ResultVoiceObject("five", 5)); list.add(new ResultVoiceObject("three", 3)); Collections.sort(list,new RankingSort()); System.out.println(list); } }
如果你想使用frase创建一个排序序列，那么你只需要为它创建一个新的comparator类并按照我上面的排序进行排序
希望这有帮助…我也付出了很多努力：D：D
我解决了合并两个answare的问题：
public class VoiceRecognitionDemo extends Activity implements Comparator() { @Override public int compare(ResultVoiceObject arg0, ResultVoiceObject arg1) { return Float.compare(arg0.getRanking(), arg1.getRanking()); } }); } public int compare(ResultVoiceObject lhs, ResultVoiceObject rhs) { // TODO Auto-generated method stub return 0; }
}
哪里：
public class ResultVoiceObject { private String frase; private float ranking; public ResultVoiceObject(String f, float r) { this.frase=f; this.ranking= r; } }
另一种方式是：
加
import java.util.Arrays;
import java.util.Comparator;
REMOVE：实现Comparator和onActivityResult的比较方法
谢谢stackoverflow社区！