java 在android中排序字符串arraylist
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sorting string arraylist in android
提问by andro-girl
I have a string arraylist called names. How do I sort the arraylist in alphabetical order?
我有一个名为names的字符串数组列表。如何按字母顺序对数组列表进行排序？
回答by Aleadam
ArrayList<String> names = new ArrayList<String>();
names =fillNames() // whatever method you need to fill here;
Collections.sort(names);
http://download.oracle.com/javase/6/docs/api/java/util/Collections.html#sort%28java.util.List%29
http://download.oracle.com/javase/6/docs/api/java/util/Collections.html#sort%28java.util.List%29
Sorts the specified list into ascending order, according to the natural ordering of its elements. All elements in the list must implement the Comparable interface. Furthermore, all elements in the list must be mutually comparable (that is, e1.compareTo(e2) must not throw a ClassCastException for any elements e1 and e2 in the list).
根据其元素的自然顺序，将指定列表按升序排序。列表中的所有元素都必须实现 Comparable 接口。此外，列表中的所有元素必须相互比较（即，e1.compareTo(e2) 不得为列表中的任何元素 e1 和 e2 抛出 ClassCastException）。
Stringimplements Comparable:
String实施Comparable：
java.lang Class String
java.lang.Object extended by java.lang.String
All Implemented Interfaces: Serializable, CharSequence, Comparable
java.lang 类字符串
由 java.lang.String 扩展的 java.lang.Object
所有实现的接口：Serializable、CharSequence、Comparable
http://download.oracle.com/javase/6/docs/api/java/lang/String.html
http://download.oracle.com/javase/6/docs/api/java/lang/String.html
回答by Aleadam
Another solution but Collections.sort()is best. I just want to show alternative
另一种解决方案，但Collections.sort()最好。我只是想展示替代品
ArrayList<String> strings = new ArrayList<String>();
strings.add("a");
strings.add("ab");
strings.add("aa");
String[] stringsArray = new String[strings.size()];
strings.toArray(stringsArray);
Arrays.sort(stringsArray);
List<String> sorted = Arrays.asList(stringsArray);
System.out.println(sorted);
回答by Polyomino
import java.util.Collections;
导入 java.util.Collections;
then use Collections.sort();
然后使用 Collections.sort();
