倒序输出的几种简单方法

public class T {
    public static void main(String[] args) {
        StringBuffer sbf = new StringBuffer();
        sbf.append("abcdefghick123456");
        System.out.println(sbf.reverse().toString());
    }
}//字符串的倒序输出
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;public class T {
    public void order() throws IOException {
        InputStreamReader is = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(is);
        String str = br.readLine();
        char c[] = str.toCharArray();
        int i = str.length();
        i--;
        char temp;
        for (int j = 0; j < i; j++, i--) {
            temp = c[j];
            c[j] = c[i];
            c[i] = temp;
        }
        System.out.println(new String(c, 0, str.length()));
    }    public static void main(String[] args) throws IOException {
        new T().order();
    }
}//输入的倒序输出 
public class T {
    public static void main(String[] args) {
        int[] array = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
        for (int i = array.length - 1; i >= 0; i--) {
            System.out.print(i);
        }
    }
}//字符串的倒序输出

=====================================

import java.lang.StringBuffer;
public class API_String {

 public static void main(String[] args) {

  String str = "abcd";
         // 字符串倒序方法一
  char[] ch = str.toCharArray();
  StringBuffer sb = new StringBuffer();
  for (int i = ch.length - 1; i >= 0; i--) {
   sb.append(ch[i]);
  }
  System.out.println(sb.toString());  // 字符串倒序方法二
  StringBuffer sbb = new StringBuffer();
  for (int i = str.length() - 1; i >= 0; i--) {
   sbb.append(str.charAt(i));
  }
  System.out.println(sbb.toString());  // 字符串倒序方法三
  System.out.println(new StringBuffer(str).reverse().toString());
 } }

方法一和方法二都是利用已知的索引进行倒序，它们的算法很类似。方法三利用了JAVA中已有API的倒序方法(StringBuffer中的reverse())在API帮助文档里是这么说的：将此字符序列用其反转形式取代。