StringBuilder与String的相互转换

public class Application {
    public static void main(String[] args) {
       //StringBuilder 转换为 String
        StringBuilder sc = new StringBuilder();
        sc.append("mqs");

        //String s = sc;这个是错误的方法
        String s = sc.toString();
        System.out.println(s);

        String s1 = "mqs1";
        //StringBuilder sc2 = s1;这个是错误的方法
        StringBuilder sc2 = new StringBuilder(s1);
        System.out.println(sc2);
    }
}