Java随记

public class Demo02 {
    public static void main(String[] args) {
        //八大基本数据类型++++++++++++++++++++++++++++++
        int num = 147258;
        byte num2 = 127;
        short num3 = 42;
        long num4 = 30L; //Long类型要在数字后加个L

        //小数：浮点型
        float num5 = 20.1F;
        double num6 = 3.1415926;

        //字符,使用单引号
        char name = 'A';
        //字符串，String不是关键字，是一个类
        String namea ="宗师";

        //布尔值：是非
        boolean flag = true;
        //boolean flag = false;
    }
}