基礎說明

package cc.openhome;
import java.util.Scanner;//懶人包
class c{
    String color;
    char size;
    c(String color,char size) //建構式(constructor
    {
       this.color=color;
       this.size=size;
    }
}
public class Main{
    public static void main(String[] args) {
        Scanner com=new Scanner(System.in);//建立實例
       final int pi=3;
       final int a=75;
       float b=3.14F;//遺失精準度問題,加f
       long d=2147483648L;//int 2147489647
       int num_scan;
       num_scan=com.nextInt();//讀取指令操作
       System.out.print(num_scan);
       System.out.println();
       c sun=new c("red",'s');
        System.out.println("hello ");
        System.out.printf("%d~%d\n",Integer.MIN_VALUE,Integer.MAX_VALUE);
        System.out.println(pi);
        System.out.println(a>70&&a<80);
        System.out.printf("%d\n",d);
        System.out.printf("%s,%c\n",sun.color,sun.size);
    }
}