String和StringBuilder相互转化

package hk45;

public class StringBuilderDemo {
    public static void main(String[] args) {
        StringBuilder sb= new StringBuilder();
        sb.append("hello");
        //StringBuilder转为String
        String s=sb.toString();
        System.out.println(s);

        //String转为StringBuilder
        String s1="java";
        StringBuilder sb1=new StringBuilder(s1);
        System.out.println(sb1);

    }
}