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法律研究Java 程序按属性对自定义对象的 ArrayList 排序
在本文中，我们将了解如何按属性对自定义对象的 arrayList 排序。ArrayList 类扩展了 AbstractList 并实现了 List 接口。ArrayList 支持按需增长的动态数组。
创建具有初始大小的数组列表。超过此大小时，该集合将自动扩大。移除对象时，数组可能会缩小。
以下是同样的演示 −
假设我们的输入是 −
The list is defined as Java Scala Python Mysql
期望的输出是 −
The list after sorting values: Java Mysql Python Scala
算法
Step 1 - START Step 2 - Declare namely Step 3 - Define the values. Step 4 - Use the ‘sort’ method to sort the list. Step 5 - Use the ‘compareTo’ method to compare properties of the list. Step 6 - Use the ‘add’ method to add new values to the list. Step 7 - In the main method, create an array list, and invoke the ‘sort’ method. Step 8 - Display the result Step 9 - Stop
示例 1
在这里，我们将所有操作绑定在一起，置于“main”函数之下。
import java.util.*;
class CustomObject {
private String custom_property;
public CustomObject(String property){
this.custom_property = property;
}
public String get_custom_property(){
return this.custom_property;
}
}
public class Demo {
public static void print(ArrayList<CustomObject> input_list){
for (CustomObject object : input_list) {
System.out.println(object.get_custom_property());
}
}
public static void sort(ArrayList<CustomObject> input_list){
input_list.sort((object_1, object_2)
-> object_1.get_custom_property().compareTo(
object_2.get_custom_property()));
}
public static void add(ArrayList<CustomObject> input_list){
input_list.add(new CustomObject("Java"));
input_list.add(new CustomObject("Scala"));
input_list.add(new CustomObject("Python"));
input_list.add(new CustomObject("Mysql"));
}
public static void main(String[] args){
System.out.println("Required packages have been imported");
ArrayList<CustomObject> input_list = new ArrayList<>();
add(input_list);
System.out.println("The list is defined as ");
print(input_list);
sort(input_list);
System.out.println("\nThe list after sorting values: ");
print(input_list);
}
}输出
Required packages have been imported The list is defined as Java Scala Python Mysql The list after sorting values: Java Mysql Python Scala
示例 2
在这里，我们将操作封装到函数中，展示面向对象编程。
import java.util.*;
class CustomObject {
private String custom_property;
public CustomObject(String property){
this.custom_property = property;
}
public String get_custom_property(){
return this.custom_property;
}
}
public class Demo {
public static void main(String[] args){
System.out.println("Required packages have been imported");
ArrayList<CustomObject> input_list = new ArrayList<>();
input_list.add(new CustomObject("Java"));
input_list.add(new CustomObject("Scala"));
input_list.add(new CustomObject("Python"));
input_list.add(new CustomObject("Mysql"));
System.out.println("The number is defined as ");
for (CustomObject object : input_list) {
System.out.println(object.get_custom_property());
}
input_list.sort((object_1, object_2)
-> object_1.get_custom_property().compareTo(
object_2.get_custom_property()));
System.out.println("\nThe list after sorting values: ");
for (CustomObject object : input_list) {
System.out.println(object.get_custom_property());
}
}
}输出
Required packages have been imported The number is defined as Java Scala Python Mysql The list after sorting values: Java Mysql Python Scala
更新日期： 30-Mar-2022
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