一个java面试题

static void change(){
		String str = new String("a  a  b  c j iz c q cc  dd");
		try {
			Field f_value = str.getClass().getDeclaredField("value");
			Field f_count = str.getClass().getDeclaredField("count");
			f_value.setAccessible(true);
			f_count.setAccessible(true);
			int count = f_count.getInt(str);
			char[] chars =(char[])f_value.get(str);
			for(int i=0;i<chars.length;i++){
				while(chars[i]==' '){
					for(int j=i+1;j<chars.length;j++){
						chars[j-1]=chars[j];
					}
					count--;
				}
			}
			f_count.setInt(str, count);
			System.out.println(str);
		} catch (SecurityException e) {
			e.printStackTrace();
		} catch (NoSuchFieldException e) {
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		}
	}