Java 代码：提取字符串中的大写字母

import java.util.Scanner;

public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); String str = scanner.nextLine(); for (int i = 0; i < str.length(); i++) { char c = str.charAt(i); if (Character.isUpperCase(c)) { System.out.print(c + ' '); } } } }