¿ìËÙÊìϤJava

package cn.bear2;


import java.util.ArrayList;

//Ò»¸öÔ´ÎļþÖÐÖ»ÄÜÓÐÒ»¸öpublicÀà,Ô´ÎļþµÄÃû³ÆÓ¦¸ÃºÍpublicÀàµÄÀàÃû±£³ÖÒ»ÖÂ
public class Demo {
    public static void main(String[] args) {
        /*
         * this is a demo;
         * */
        System.out.println("hello world"); //Ë«ÒýºÅ¿ÉÒÔ×°Èô¸É×Ö·û£¬³ÆΪ×Ö·û´®
        System.out.println('h'); // µ¥ÒýºÅÖ»ÄÜ×°µ¥¸ö×Ö·û

        //function call
        foo(5, 10);

        // Êý×é
        String[] fool_array= {"hello","world"};
        System.out.println(fool_array);
        // ArrayList,¸üÏ°¹ßÕâ¸ö.ÊôÓÚÒýÓÃÀàÐÍÊý¾Ý½á¹¹
        ArrayList<String> fool_array_list= new ArrayList<String>();
        fool_array_list.add("hello");
        fool_array_list.add("world");
        System.out.println(fool_array_list);
        
        // for Ñ­»·
        for (int i = 0; i <= 3; i++) {
            System.out.println(i);
        }
        // for each ·ç¸ñ
        for(String item:fool_array_list){
            System.out.println(item);
        }

        long dt = System.currentTimeMillis();
        System.out.println(dt);

        //final ÐÞÊεij£Á¿ÊDz»ÄÜÐ޸ĵÄ
        final double PI = 3.1415927;

        // ö¾Ùdemo
        FreshJuice juice = new FreshJuice();
        juice.size = FreshJuice.FreshJuiceSize.SMALL;
        
    }

    private static void foo(Integer param1, Integer secondParam) {
        Integer res = param1 + secondParam;
        if (res > 10) {
            System.out.println("res´óÓÚ10");
        } else if (res <= 1) {
            System.out.println("resСÓÚ1");
        } else {
            System.out.println(res);
        }
    }
}

//Ò»¸öÔ´Îļþ¿ÉÒÔÓжà¸ö·ÇpublicÀà
class FreshJuice {
    enum FreshJuiceSize {SMALL, MEDIUM, LARGE}

    FreshJuiceSize size;
}