翻转字符串

		String str="student. a am I";
		System.out.println(reverse(str));
//		String str="GOOGLE";
//		System.out.println(findFirstC(str));
//		System.out.println(LastRemaining_Solution(-1, 3));
	}
	public static String reverse(String str){
		String strsub=reverse2(str);
		String []data=strsub.split(" ");
		String res="";
		for(String s:data){
			res=res+reverse2(s)+" ";
		}
		return res.substring(0, res.length()-1);
	}
	public static String reverse2(String str){
		char[]chs=str.toCharArray();
		for(int i=0,j=chs.length-1;i<=j;i++,j--){
			char temp=chs[i];
			chs[i]=chs[j];
			chs[j]=temp;
		}
		return String.valueOf(chs);
	}