不使用字符串函数反转字符串

Question

如何在不使用字符串函数的情况下编写一个java程序来反转字符串？

 String a="Siva";

 for(int i=0;i<=a.length()-1;i++)
 {
     System.out.print(a.charAt(i));
 }
     System.out.println("");

 for(int i = a.length() - 1; i >= 0; --i)
 {
     System.out.print(a.charAt(i)); 
 }

这里的charAt()和a.length()是字符串函数

Answer 1

这会有帮助的

public class StringReverse {

   public static void main(String[] args){
    String str = "Reverse";
    StringBuilder sb = new StringBuilder(str);
    str = sb.reverse().toString();
    System.out.println("ReverseString : "+str);
  }

}

不能使用字符串方法

Answer 2

String s = "abcdef";
char c[] = s.toCharArray();

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

Answer 3

使用StringBuilder类或StringBuffer类他们已经有了一个reverse()方法来反转字符串

StringBuilder str = new StringBuilder("india");
System.out.println("string = " + str);

// reverse characters of the StringBuilder and prints it
System.out.println("reverse = " + str.reverse());

// reverse is equivalent to the actual
str = new StringBuilder("malayalam");
System.out.println("string = " + str);

// reverse characters of the StringBuilder and prints it
System.out.println("reverse = " + str.reverse());

http://docs.oracle.com/javase/7/docs/api/java/lang/StringBuilder.html