Java 程序来合并两个列表
在本文中,我们将了解如何合并两个列表。列表是一个有序集合,它允许我们按顺序存储和访问元素。它包含用于插入、更新、删除和搜索元素的基于索引的方法。它还可以包含重复元素。
以下是相同的演示 −
假设我们的输入是 −
First list: [45, 60, 95] Second list: [105, 120]
期望的输出将是 −
The list after merging the two lists: [45, 60, 95, 105, 120]
算法
Step 1 - START Step 2 - Declare three integer lists namely input_list_1, input_list_2 and result_list. Step 3 - Define the values. Step 4 - Use result_list.addAll(input_list_1) to add all the elements of the input_list_1 to the result list. Step 5 - Use result_list.addAll(input_list_2) to add all the elements of the input_list_2 to the result list. Step 6 - Display the result_list. Step 7 - Stop
示例 1
在这里,我们把所有操作绑定在一起,放在“main”函数之下。
import java.util.ArrayList;
import java.util.List;
public class Demo {
public static void main(String[] args) {
List<Integer> input_list_1 = new ArrayList<>();
input_list_1.add(45);
input_list_1.add(60);
input_list_1.add(95);
System.out.println("The first list is defined as: " + input_list_1);
List<Integer> input_list_2 = new ArrayList<>();
input_list_2.add(105);
input_list_2.add(120);
System.out.println("The second list is defined as: " + input_list_2);
List<Integer> result_list = new ArrayList<>();
result_list.addAll(input_list_1);
result_list.addAll(input_list_2);
System.out.println("\nThe list after merging the two lists: " + result_list);
}
}输出
The first list is defined as: [45, 60, 95] The second list is defined as: [105, 120] The list after merging the two lists: [45, 60, 95, 105, 120]
示例 2
在这里,我们将操作封装成函数,展示面向对象编程。
import java.util.ArrayList;
import java.util.List;
public class Demo {
static void merge(List<Integer> input_list_1, List<Integer> input_list_2){
List<Integer> result_list = new ArrayList<>();
result_list.addAll(input_list_1);
result_list.addAll(input_list_2);
System.out.println("\nThe list after merging the two lists: " + result_list);
}
public static void main(String[] args) {
List<Integer> input_list_1 = new ArrayList<>();
input_list_1.add(45);
input_list_1.add(60);
input_list_1.add(95);
System.out.println("The first list is defined as: " + input_list_1);
List<Integer> input_list_2 = new ArrayList<>();
input_list_2.add(105);
input_list_2.add(120);
System.out.println("The second list is defined as: " + input_list_2);
merge(input_list_1, input_list_2);
}
}输出
The first list is defined as: [45, 60, 95] The second list is defined as: [105, 120] The list after merging the two lists: [45, 60, 95, 105, 120]
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