對ArrayList存放的對象,按照對象的某個屬性進行排序。


使用Collections.sort()方法進行實現:

import
java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.List; public class Child { private int id; private String name; public Child() { super(); } public Child(int id, String name) { super(); this.id = id; this.name = name; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public static void main(String[] args) { List<Child> list = new ArrayList<Child>(); Child child1 = new Child(1,"aa"); Child child2 = new Child(2,"bb"); Child child3 = new Child(3,"cc"); Child child4 = new Child(4,"dd"); list.add(child1); list.add(child2); list.add(child3); list.add(child4); //對鏈表進行排序 Collections.sort(list, new sortById()); System.out.println("按照id進行排序:"); for (Child child : list) { System.out.println(child.getId()+" "+child.getName()); } } } //實現Comparator接口 class sortById implements Comparator{ public int compare(Object o1, Object o2) { if(((Child)o1).getId()>((Child)o2).getId()) return 1; return -1; } }

 


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