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法律研究Java程序检查一个集合是否为另一个集合的子集
在本文中，我们将了解如何检查一个集合是否为另一个集合的子集。集合是一个不能包含重复元素的集合。它模拟了数学集合的抽象。集合接口仅包含从集合继承的方法，并增加了禁止重复元素的限制。
以下是演示说明 −
假设我们的输入是 −
First set: [90, 75, 60, 45] Second set : [90, 60]
所需的输出是 −
Is a sets sub-set of the other? true
算法
Step 1 - START Step 2 - Declare namely Step 3 - Define the values. Step 4 - Create two Sets, and add elements to it using the ‘add’ method. Step 5 - Display the Sets on the console. Step 6 - Create a Boolean variable and call the ‘containsAll’ method on one set with respect to the other. Step 7 - This checks if one set is a subset of the other. Step 8 - If yes, it returns True, else False. Step 9 - Display the result on the console. Step 10 - Stop
示例 1
在这里，我们将所有操作捆绑在“main”函数下。
import java.util.HashSet;
import java.util.Set;
public class Demo {
public static void main(String[] args) {
System.out.println("The required packages have been imported");
Set<Integer> input_set_1 = new HashSet<>();
input_set_1.add(45);
input_set_1.add(60);
input_set_1.add(75);
input_set_1.add(90);
System.out.println("The first set is defined as: " + input_set_1);
Set<Integer> input_set_2 = new HashSet<>();
input_set_2.add(60);
input_set_2.add(90);
System.out.println("The second set is defined as: " + input_set_2);
boolean result = input_set_1.containsAll(input_set_2);
System.out.println("\nIs a sets sub-set of the other? \n" + result);
}
}输出
The required packages have been imported The first set is defined as: [90, 75, 60, 45] The second set is defined as: [90, 60] Is a sets sub-set of the other? true
示例 2
在这里，我们将操作封装到展现面向对象的编程的函数中。
import java.util.HashSet;
import java.util.Set;
public class Demo {
static void is_subset(Set<Integer> input_set_1, Set<Integer> input_set_2){
boolean result = input_set_1.containsAll(input_set_2);
System.out.println("\nIs a sets sub-set of the other? \n" + result);
}
public static void main(String[] args) {
System.out.println("The required packages have been imported");
Set<Integer> input_set_1 = new HashSet<>();
input_set_1.add(45);
input_set_1.add(60);
input_set_1.add(75);
input_set_1.add(90);
System.out.println("The first set is defined as: " + input_set_1);
Set<Integer> input_set_2 = new HashSet<>();
input_set_2.add(60);
input_set_2.add(90);
System.out.println("The second set is defined as: " + input_set_2);
is_subset(input_set_1, input_set_1);
}
}输出
The required packages have been imported The first set is defined as: [90, 75, 60, 45] The second set is defined as: [90, 60] Is a sets sub-set of the other? true
更新于：30-Mar-2022
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