String 帅哥 = "刘佳衢";
        System.out.println(帅哥);
        //八大数据类型
        //整数
        int num1 = 10;//最常用
        byte num2 = 20;
        short num3 = 30;
        long num4 = 30L;//long类型要在数字后面＋L

        //小数；浮点数
        float num5 = 50.1F;//float类型要在数字后面+F
        double num6 = 3.1415926;

        //字符
        char name = 'A';
        //字符串，String不是关键字，类
        String namee = "刘佳衢";

        //布尔值
        boolean flag = true;
        //boolean flag = false