题解 | #map简单应用#
map简单应用
https://www.nowcoder.com/practice/7a47e465315c40848d5daba676f9ac29
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
// 创建Map集合
Map<Integer, String> map = new HashMap<>();
map.put(1, "Amy");
map.put(2, "Joe");
map.put(3, "Tom");
map.put(4, "Susan");
// 遍历并打印原始Map
for (Map.Entry<Integer, String> entry : map.entrySet()) {
System.out.println(entry.getKey() + ":" + entry.getValue());
}
System.out.println();
// 2. 向Map中插入新的信息
Scanner scanner = new Scanner(System.in);
String newName = scanner.nextLine();
map.put(5, newName);
// 3. 移除编号为4的信息
map.remove(4);
// 4. 修改编号为3的姓名信息
map.put(3, "Tommy");
// 再次遍历并打印更新后的Map
for (Map.Entry<Integer, String> entry : map.entrySet()) {
System.out.println(entry.getKey() + ":" + entry.getValue());
}
}
}
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