JAVA字串反轉的三種方法
阿新 • • 發佈:2020-09-03
方法一:使用StringBuilder
import java.util.Scanner; public class StrReversal { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); String str = scanner.nextLine(); System.out.println(new StringBuilder(str).reverse()); } }
方法二:使用迴圈
import java.util.Scanner; public class StrReversal { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); String str = scanner.nextLine(); char[] chars = str.toCharArray(); String reverse = ""; for (int i = chars.length - 1;i>=0;i--){ reverse += chars[i]; } System.out.println(reverse); } }
方法三:考慮到String不可變,使用StringBuilder
import java.util.Scanner; public class StrReversal { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); String str = scanner.nextLine(); char[] chars = str.toCharArray(); StringBuilder reverse = new StringBuilder(); for (int i = chars.length - 1;i>=0;i--){ reverse.append(chars[i]); } System.out.println(reverse); } }
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