Demo02

```java
package com.company;

public class Main {
    public static void main(String[] args) {
        //八大基本数据类型

        //整数
        int num1 =10;   //最常用
        byte num2 = 20;
        short num3 = 30;
        long num4 = 30L;//Long类型要在数字后面加个L

        //小数：浮点型
        float num5 = 50.1F; //float类型要在数字后面加个F
        double num6 = 3.1415926;


        //字符
        char name = ‘A‘;
        //字符串, String不是关键字，类
        String name1 = "啧啧";

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

        System.out.println(num1);
        System.out.println(num2);
        System.out.println(num3);
        System.out.println(num4);
        System.out.println(num5);
        System.out.println(num6);
        System.out.println(name);
        System.out.println(name1);
        System.out.println(flag);

    }
}

```