[英]Java Comparator class to sort particular object array
I have a float array and a String array. 我有一个浮点数组和一个字符串数组。 each float value match with a specific String. 每个浮点值都与特定的String匹配。 I would like to sort the float array keeping the own string using : 我想使用以下方式对保留自己的字符串的float数组进行排序:
public static <T> void sort(T[] a,Comparator<? super T> c)
Here is the code: 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<String> 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*/
}
How can I sort by ranking and keeping the own String? 如何排序并保留自己的字符串?
Thanks a lot. 非常感谢。
ResultVoiceObject[] objects = ...
Arrays.sort(objects, new Comparator<ResultVoiceObject>() {
@Override
public int compare(ResultVoiceObject arg0, ResultVoiceObject arg1) {
return Float.compare(arg0.getRanking(), arg1.getRanking());
}
});
Assuming you have a getRanking()
accessor for the private field ranking
. 假设您有一个用于私有字段ranking
的getRanking()
访问器。
public class ResultComparator implements Comparator<ResultVoiceObject> {
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());
You need to implement the Comparator
interface. 您需要实现Comparator
接口。 You can create multiple sort sequences while using Comparator
. 您可以在使用Comparator
同时创建多个排序序列。
Suppose you want to sort your array according to your ranking, then create a separate class which implements Comparator
假设您要根据排名对数组进行排序,然后创建一个单独的类来实现Comparator
public Class RankingSorter implements Comparator<ResultVoiceObject> {
public int compare(ResultVoiceObject one, ResultVoiceObject another){
return (int)(one.getRanking() - another.getRanking());
}
}
Then in the new class that you want to sort your array, You create the object of the comparator
and pass it to collection 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);
This is the overloaded version of sort
method which takes the comparator
. 这是采用comparator
的sort
方法的重载版本。
I had written a full tutorial regarding this a while ago http://www.dreamincode.net/forums/topic/174322-the-comparable-and-comparator-interface-part-ii/ 不久前,我已经写了一个完整的教程,有关此信息http://www.dreamincode.net/forums/topic/174322-the-comparable-and-comparator-interface-part-ii/
Here is the ResultVoicObject class 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
+ "]";
}
}
Implement the Comparator
interface as follows, you need to implement compare
method 如下实现Comparator
接口,您需要实现compare
方法
package com.compare;
import java.util.Comparator;
public class RankingSort implements Comparator<ResultVoiceObject> {
public int compare(ResultVoiceObject one, ResultVoiceObject another){
return (int) (one.getRanking() - another.getRanking());
}
}
You can test it as below. 您可以如下进行测试。
package com.compare;
import java.util.ArrayList;
import java.util.Collections;
public class RankingSorterTest{
public static void main(String [] args){
ArrayList<ResultVoiceObject> list = new ArrayList<ResultVoiceObject>();
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);
}
}
If you want to create a sorting sequence using frase, then you just need to create a new comparator
class for it and sort just as I have sorted above 如果要使用frase创建排序序列,则只需为其创建一个新的comparator
类并按照我上面的排序进行排序
Hope this helps... took a lot of efforts from me also :D :D 希望这会有所帮助...我也付出了很多努力:D:D
I solved merging both answare: 我解决了合并两个软件:
public class VoiceRecognitionDemo extends Activity implements Comparator<ResultVoiceObject {
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
...
ResultVoiceObject[] risultati= ...;
Arrays.sort(risultati, new Comparator<ResultVoiceObject>() {
@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;
}
} }
Where: 哪里:
public class ResultVoiceObject
{
private String frase;
private float ranking;
public ResultVoiceObject(String f, float r)
{
this.frase=f;
this.ranking= r;
}
}
Another way is: 另一种方法是:
ADD 加
import java.util.Arrays; 导入java.util.Arrays;
import java.util.Comparator; 导入java.util.Comparator;
REMOVE: implements Comparator and the compare methos out onActivityResult 删除:实现Comparator和onActivityResult上的比较方法
Thanks stackoverflow comunity! 谢谢stackoverflow社区!
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