方法一:
import java.util.Scanner; public class Main{ public static void main(String[] args) { Scanner in = new Scanner(System.in); String str = in.next(); char[] ch = str.toCharArray(); for (int i = 0; i < ch.length; i++) { if ((ch[i] >= 'A' && ch[i] <= 'Z') || (ch[i] >= 'a' && ch[i] <= 'z')) { System.out.print(ch[i]); } } } }
方法二:
import java.util.Scanner; public class Main{ public static void main(String[] args) { Scanner in = new Scanner(System.in); String str = in.next(); for (int i = 0; i < str.length(); i++) { if ((str.charAt(i) >= 'A' && str.charAt(i) <= 'Z') || (str.charAt(i) >= 'a' && str.charAt(i) <= 'z')) { System.out.print(str.charAt(i)); } } } }
方法三:
import java.util.Scanner; public class Main{ public static void main(String[] args) { Scanner in = new Scanner(System.in); String str = in.next(); char[] ch = str.toCharArray(); for (int i = 0; i < str.length(); i++) { if (Character.isLetter(ch[i])||Character.isUpperCase(ch[i])) { System.out.print(ch[i]); } } } }
方法四:
import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); while (in.hasNext()) { System.out.println(in.nextLine().replaceAll("[^a-zA-Z]+","")); } in.close(); } }
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