StringBuilder 拼接

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package com.company;

public class demo {
    public static void main(String[] args) {

        // 创建一个StringBuilder对象，用来存储字符串
        StringBuilder hobby = new StringBuilder ("爱慕课");
        StringBuilder hobby1 = new StringBuilder ("imooc");
        //两个StringBuilder对象不能拼接
        // System.out.println(hobby+hobby1);
//象间不能拼接，对象和字符串能拼接，加""相当于加了字符串
        System.out.println (hobby + "" + hobby1);

    }
}