public static void main(String[] args) {
        //1.字符数组 转换成 字符串
        //(1)直接在构造String时转换
        char[] array = new char[] {'a','b','c','d','e','f','g'};
        String str = new String(array);
        System.out.println(str);
        
        //(2)调用String类的提供的方法的valueOf()
        String str2 = String.valueOf(array);
        System.out.println(str2);
        
        //2.字符串  转换成 字符数组 
        //(1)调用String类的提供的方法的toCharArray()
        String msg = "i am a good boy!";
        char[] dest = msg.toCharArray();
        System.out.println(Arrays.toString(dest));
    }