字符串拼接引号

拼接双引号语法:  "\""  + ..... +  "\""

eg:

public class Test { 
	public static void main(String[] args) {
        String content ="[\"abc\",\"ABC\",\"好心情\"]";
        String macType = "设备";
        StringBuilder sb = new StringBuilder();
        String s = content.substring(0,content.length()-1);
        String newContent = sb.append(s).append(",").append("\"").append(macType).append("\"").append("]").toString();
        System.out.println(newContent);
	}
}

显示结果:

["abc","ABC","好心情","设备"]