Java倒序输出数字

Posted 2023-04-25

要求用户输入一个10位数的数字，然后倒序输出
java完成

import java.util.Scanner;

public class test
public static void main(String[] args)
Scanner sc = new Scanner(System.in);
char[] ch = null;
System.out.println("请输入一个十位数的数字");
String str = sc.next();
if (str.trim().length() != 10)
System.out.println("你输入的数字格式不正确，清检查后重新输入");
else
ch = str.toCharArray();

for (int i = ch.length; i > 0 ; i--)
System.out.print(ch[i-1]);


参考技术A StringBuffer sb =new StringBuffer();
sb.append("1234567890");
System.out.println(sb.reverse().toString()); 参考技术B public class Test

public StringBuilder Write() throws IOException
BufferedReader buff = new BufferedReader(new InputStreamReader(System.in));
String content;
StringBuilder sb = new StringBuilder();

sb.append(buff.readLine());

return sb.reverse();


public static void main(String[] args) throws ClassNotFoundException, IOException
System.out.println(new Test().Write());

Java实现给定字符串的倒序输出

1.除2判中法：

public String orderDesc(String str){
       byte [] bytes = str.getBytes();
       for ( int i = 0; i < bytes.length / 2 ; i++) {
             Byte b = bytes [i] ;
             bytes [i] = bytes [bytes.length - 1 -i ] ;
             bytes [bytes.length - 1 -i ] = b ;
       }
       return new String (bytes) ;
}

2.String类的toCharArray();

public static String orderDesc(String str){
      char[] charArray = str.toCharArray(); 
      String newStr = "";
      for (int i=charArray.length-1; i>=0; i--){ 
        newStr += charArray[i]; 
      } 
      return newStr;
}