逆序

public class nixv {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub

		
		String aString="abcdefg";
		char achar[]=aString.toCharArray();
	
		for (int i = 0; i < achar.length/2; i++) {
			swap(achar,i, achar.length-1-i);
		}
		for (int i = 0; i < achar.length; i++) {
			System.out.print(achar[i]);
		}
		
	}
	public static void swap(char []str,int i, int j){
		char temp = str[i];
		str[i] = str[j];
		str[j] = temp;
		}
}