- List里面装的对象是自定义的，重载这个对象的compareTo()方法，在这个方法中根据属性A来判断大小。
之后用Collections.sort()对你的list进行排序
- 容器内元素实现Comparetor接口，Collections.sort()把它传进去就可以了
- 将内部对象继承comparable接口，实现一个compareTo接口，调用java.util.Collections.sort()方法
- Collections.sort(fileList, new FileNodeComparator(form.getSortName(),form.isAsc()));
class FileNodeComparator implements Comparator{
private String sortName = "name";
private boolean isAsc = true;
FileNodeComparator(String sortName,boolean isAsc){
this.sortName = sortName;
this.isAsc = isAsc;
}
public int compare(Object arg0, Object arg1) {
。。。。。。。。
。。。。。。。。
。。。。。。。。
。。。。。。。。
}
}
- public class SortList {
public static void main(String args[]) {
String words[] = { "man", "Man", "Woman", "woman", "Manana", "manana", "ma?ana", "Ma?ana", "Mantra", "mantra",
"mantel", "Mantel" };
PrintStream out = System.out;
List list = new ArrayList(Arrays.asList(words));
out.println("传入的list:");
out.println(list);
out.println();
Collections.sort(list);
out.println("默认的sorting:");
out.println(list);
out.println();
list = new ArrayList(Arrays.asList(words));
Comparator comp = Collections.reverseOrder();
Collections.sort(list, comp);
out.println("反向sorting:");
out.println(list);
out.println();
list = new ArrayList(Arrays.asList(words));
comp = new CollatorComparator();
Collections.sort(list, comp);
out.println("自定义排序sorting:");
out.println(list);
out.println();
list = new ArrayList(Arrays.asList(words));
comp = new CaseInsensitiveComparator();
Collections.sort(list, comp);
out.println("按照语种sorting:");
out.println(list);
out.println();
}
/**
#############################################################################
#
# @DESCRIBE 自定义的排序规则
# @author Administrator
#
#############################################################################
*/
public static class CaseInsensitiveComparator implements Comparator {
public int compare(Object element1, Object element2) {
String lower1 = element1.toString().toLowerCase();
String lower2 = element2.toString().toLowerCase();
return lower1.compareTo(lower2);
}
}
/**
#############################################################################
#
# @DESCRIBE 按照语种进行排序的规则
# @author Administrator
#
#############################################################################
*/
public static class CollatorComparator implements Comparator {
Collator collator = Collator.getInstance();
public int compare(Object element1, Object element2) {
CollationKey key1 = collator.getCollationKey(element1.toString());
CollationKey key2 = collator.getCollationKey(element2.toString());
return key1.compareTo(key2);
}
}
}
posted on 2008-05-30 16:47
蓝山 阅读(934)
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