今天就跟大家聊聊有關如何使用List對象實現去重，可能很多人都不太了解，為了讓大家更加了解，小編給大家總結了以下內容，希望大家根據這篇文章可以有所收獲。
1、List<Object>去重
People類
public class People {
private int id;
private String name;
private Date createDate;
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 Date getCreateDate() {
return createDate;
}
public void setCreateDate(Date createDate) {
this.createDate = createDate;
}
} main方法
public static void main(String[] args) throws Exception{
List<People> list = new ArrayList<People>();
People p1 = new People();
p1.setId(1);
p1.setName("趙");
list.add(p1);
People p2 = new People();
p2.setId(2);
p2.setName("錢");
list.add(p2);
People p3 = new People();
p3.setId(3);
p3.setName("孫");
list.add(p3);
People p4 = new People();
p4.setId(4);
p4.setName("李");
list.add(p4);
People p5 = new People();
p5.setId(5);
p5.setName("周");
list.add(p5);
list.add(p1);
for(People p : list){
System.out.println(p);
}
System.out.println("==========================");
Set<People> set = new HashSet<People>(list);
list.clear();
list.addAll(new ArrayList<People>(set));
for(People p : list){
System.out.println(p);
}
} 2、List<Object>按照日期字段排序
自定義Comparator
public class MyComparator implements Comparator<People> {
@Override
public int compare(People p1, People p2) {
return p1.getCreateDate().compareTo(p2.getCreateDate());
}
} main方法
public static void main(String[] args) throws Exception{
List<People> list = new ArrayList<People>();
People p1 = new People();
p1.setId(1);
p1.setName("趙");
p1.setCreateDate(new Date(new Date().getTime() + 1000));
list.add(p1);
People p2 = new People();
p2.setId(2);
p2.setName("錢");
p2.setCreateDate(new Date(new Date().getTime() + 8000));
list.add(p2);
People p3 = new People();
p3.setId(3);
p3.setName("孫");
p3.setCreateDate(new Date(new Date().getTime() + 7000));
list.add(p3);
People p4 = new People();
p4.setId(4);
p4.setName("李");
p4.setCreateDate(new Date(new Date().getTime() + 5000));
list.add(p4);
People p5 = new People();
p5.setId(5);
p5.setName("周");
p5.setCreateDate(new Date(new Date().getTime() + 6000));
list.add(p5);
for(People p : list){
System.out.println(p.getId());
}
//1,2,3,4,5
System.out.println("=======================");
Collections.sort(list, new MyComparator());
//1,4,5,3,2
for(People p : list){
System.out.println(p.getId());
}
} 看完上述內容，你們對如何使用List對象實現去重有進一步的了解嗎？如果還想了解更多知識或者相關內容，請關注億速云行業資訊頻道，感謝大家的支持。
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