java-数据类型

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import com.sun.org.apache.xpath.internal.operations.Bool;   public class Demo2 {     public static void main(String[] args) {         int num = 10;         System.out.println(num);         //八大基本数字类型         //byte -128~127         int num1 = 10;         byte num2 = 20;         short num3 = 30;         long num4 = 40L;//long类型要在数字后加L         float num5 = 50.1F;//flost类型要在数字后面加f         double num6 = 3.1415;         boolean flag = true;         char name = 'A';         //String不是关键字，是一种类     } }