【Java中对象按照属性排序】
2013-09-24 14:29
344 查看
项目中经常需要用到比如地区列表按照中文的拼音首字母排序,但是有时候获取到的地区列表是对象的形式,有地区id,地区名称两个属性。这里主要涉及到两个技术点:
1、对象按属性排序;2、中文按拼音首字母排序。下面给出自己整理好的demo:
import java.text.Collator;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import org.apache.commons.beanutils.BeanComparator;
import org.apache.commons.collections.ComparatorUtils;
import org.apache.commons.collections.comparators.ComparableComparator;
import org.apache.commons.collections.comparators.ComparatorChain;
public class CompareTipA {
private int id;
private String name;
private String age;
@SuppressWarnings("unchecked")
public static void main(String []args) {
ArrayList<Object> list = new ArrayList<Object>();
list.add(new CompareTipA(1,"3","五"));
list.add(new CompareTipA(2,"1","六"));
list.add(new CompareTipA(5,"5","二"));
list.add(new CompareTipA(3,"4","四"));
list.add(new CompareTipA(8,"4","四"));
list.add(new CompareTipA(4,"2","一"));
Comparator mycmp = ComparableComparator.getInstance();
mycmp = ComparatorUtils.nullLowComparator(mycmp);
//允许null
mycmp = ComparatorUtils.reversedComparator(mycmp); //逆序
ArrayList<Object> sortFields = new ArrayList<Object>();
Comparator<Object> comparator=Collator.getInstance(java.util.Locale.CHINA);
sortFields.add(new BeanComparator("name",comparator)); //name正序 (主)
sortFields.add(new BeanComparator("id", mycmp));
//id逆序 (副)
ComparatorChain multiSort = new ComparatorChain(sortFields);
Collections.sort(list,multiSort);
for (int i =0;i<list.size();i++) {
System.out.println(list.get(i));
//输出 /*
[id=5,name=二,age=5]
[id=2,name=六,age=1]
[id=8,name=四,age=4]
[id=3,name=四,age=4]
[id=1,name=五,age=3]
[id=4,name=一,age=2]*/
}
}
public CompareTipA(int id, String age,String name) {
this.id = id;
this.name = name;
this.age = age;
}
public int getId() {
return this.id;
}
public void setId(int id) {
this.id = id;
}
1、对象按属性排序;2、中文按拼音首字母排序。下面给出自己整理好的demo:
import java.text.Collator;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import org.apache.commons.beanutils.BeanComparator;
import org.apache.commons.collections.ComparatorUtils;
import org.apache.commons.collections.comparators.ComparableComparator;
import org.apache.commons.collections.comparators.ComparatorChain;
public class CompareTipA {
private int id;
private String name;
private String age;
@SuppressWarnings("unchecked")
public static void main(String []args) {
ArrayList<Object> list = new ArrayList<Object>();
list.add(new CompareTipA(1,"3","五"));
list.add(new CompareTipA(2,"1","六"));
list.add(new CompareTipA(5,"5","二"));
list.add(new CompareTipA(3,"4","四"));
list.add(new CompareTipA(8,"4","四"));
list.add(new CompareTipA(4,"2","一"));
Comparator mycmp = ComparableComparator.getInstance();
mycmp = ComparatorUtils.nullLowComparator(mycmp);
//允许null
mycmp = ComparatorUtils.reversedComparator(mycmp); //逆序
ArrayList<Object> sortFields = new ArrayList<Object>();
Comparator<Object> comparator=Collator.getInstance(java.util.Locale.CHINA);
sortFields.add(new BeanComparator("name",comparator)); //name正序 (主)
sortFields.add(new BeanComparator("id", mycmp));
//id逆序 (副)
ComparatorChain multiSort = new ComparatorChain(sortFields);
Collections.sort(list,multiSort);
for (int i =0;i<list.size();i++) {
System.out.println(list.get(i));
//输出 /*
[id=5,name=二,age=5]
[id=2,name=六,age=1]
[id=8,name=四,age=4]
[id=3,name=四,age=4]
[id=1,name=五,age=3]
[id=4,name=一,age=2]*/
}
}
public CompareTipA(int id, String age,String name) {
this.id = id;
this.name = name;
this.age = age;
}
public int getId() {
return this.id;
}
public void setId(int id) {
this.id = id;
}
相关文章推荐
- java list按照元素对象的指定多个字段属性进行排序
- java list按照 对象 指定多个字段属性进行排序
- java如何对ArrayList中对象按照该对象某属性排序
- JAVA 对象数组按照多个属性进行排序
- java list按照元素对象的指定多个字段属性进行排序
- java如何对ArrayList中对象按照该对象某属性排序
- Java按照对象属性排序的两种方法
- 【Java中对象按照属性排序】
- java如何对ArrayList中对象按照该对象某属性排序
- java如何对ArrayList中对象按照该对象某属性排序
- java list按照 对象 指定多个字段属性进行排序
- java list按照 对象 指定多个字段属性进行排序
- JAVA如何对ArrayList中对象按照该对象某属性排序(实例)
- Java中对象按照属性排序
- java如何对ArrayList中对象按照该对象某属性排序
- java list按照元素对象的指定多个字段属性进行排序
- JAVA如何对ArrayList中对象按照该对象某属性排序(实例)
- java list按照元素对象的指定多个字段属性进行排序
- java list按照元素对象的指定多个字段属性进行排序
- C#中List实现按照对象属性排序