CCI 1.2 反转字符串

反转字符串

package test;

public class ReverseString {

	//java implements
	public static String reverseString(String str){
		if(str==null || str.length()==0)
			return str;
		char[] array = str.toCharArray();
		int i=0, j=array.length-1;
		while(i<j){
			char temp = array[i];
			array[i] = array[j];
			array[j] = temp;
			i++;
			j--;
		}
		return new String(array);
		
	}
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String case1 = null;
		String case2 = "";
		String case3 = "a";
		String case4 = "abcde";
		
		String result = reverseString(case4);
		System.out.println(case3);
	}

}