用java 编写程序，使12345变成54321怎样运算啊？

用java 编写程序，使12345变成54321怎样运算啊？

class Test
{
public static void main(String[] args)
{
StringBuffer sb = new StringBuffer("123456789");
System.out.println(sb.reverse());
}
}

创建一个list数组
List list=new ArrayList();
list.Add(1);
list.Add(2);
list.Add(3);
list.Add(4);
list.Add(5);
List list1=new ArrayList();
for(int i=4;i>=0;i--)
{
list1.set(list.get(i));
}
list1里就是“54321”了

public class Back {
//number为要输入的数，返回的是倒叙后的结果
public int backFunction(int number) {
StringBuffer temp = new StringBuffer("" + number);
int length = temp.length();
StringBuffer str = new StringBuffer(length);
for (int i = length - 1; i > -1 ; i++){
str.append(temp.charAt(i));
}
return Integer.parseInt(str.toString());
}
}

import java.util.*;
public class rev
{
public static void main(String args[])
{
Scanner in=new Scanner(System.in);
int m=in.nextInt();
while(m!=0)
{
System.out.print(m%10);
m=m/10;
}
}
}

public static void main(String[] args) {
// TODO 自动生成方法存根
String str = "12345";
int j = str.length();

char s[] = new char[str.length()];

for(int i=0;i
s[i] = str.charAt(i);
}
for(int i=0;i
char ss = str.charAt(j-i-1);
s[j-i-1] = s[i];
s[i] = ss;

}

for(int i=0;i
System.out.println(s[i]);
}
}

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class enterdialog {
public static void main(String args[]) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String str = br.readLine();
char a[] = str.toCharArray();
for (int i = a.length - 1; i >= 0; i--)
System.out.print(a[i] + " ");
System.out.println();
}
}