java 取字符串中漢字之前的部門

String dd="ddfdf你好";
char[] ddc = dd.toCharArray();
		StringBuilder result = new StringBuilder();
		for(char ddce: ddc) {
			if((int)ddce >-128 && (int)ddce < 127) {
				result.append(ddce);
			} else 
				break;
		}
System.out.println(result.toString());