java-StringBuilder

/**
 * Author: 明明就会被淘汰
 * Date: 2022/1/22 下午4:22
 * Title: 
 */
public class StringBuilder {
    public static void main(String[] args) {
        StringBuilder sb = new StringBuilder();
        System.out.println("sb:" + sb);
        System.out.println("sb.lenght:" + sb.length());

        StringBuilder sb2 = new StringBuilder("hello");
        System.out.println("sb2:" + sb2);
        System.out.println("sb2.lenght:" + sb2.length());

    }
}