寫在前面

最近著手學習Java，根據網課以及課本自學，網課是中國大學MOOC上邊有許多關於Java的教程，以及一個網站—>網課網址，而課本就是比較有名的《Head first Java》，這個在Java入門裡面算是比較經典的教材，網上有推薦《think in Java》這本教材的，這的確是一本好書，但是對於剛剛入門的小白並不友好，選擇更為系統的《Head first Java》是更好的選擇（針對於小白而言）

言歸正傳，Java是面向物件的語言，就好像有一本書，這是一個類，而書的頁數，尺寸，薄厚，出版日期就是它的屬性，下面以蓋倫和提莫為例

public class Hero {
	String name;
	float hp;
	float armor;
	int movespeed;//這樣就設計好了一個類了
	
	public static void main(String[] args) {
		Hero garen = new Hero();
		garen.name = "蓋倫";
		garen.hp = 123;
		garen.armor = 888;
		garen.movespeed = 111;
		
		Hero teemo = new Hero();
		teemo.name = "提莫";
		teemo.hp = 111;
		teemo.armor = 444;
		teemo.movespeed = 111;
		//編寫的第一個類 YES
		
	}
}
 

這樣就建立了一個類以及它的屬性就被描述出來，有過其他語言知識的理解其難並不難，譬如學過C語言的學生。

接下來是我在《Head first Java》裡面copy的一個程式碼，可以先模仿著別人的程式碼去學習借鑑，後期積累多了自己就能上手了以下就是這個簡單程式碼，是一個數啤酒瓶的童謠

public class BeerSong {
	public static void main(String[] args) {
		int beerNum = 99;
		String word = "bottles";
		
		while(beerNum >0) {
			
			if(beerNum == 1) {
			word = "bottles";//單數的瓶子	
			}
			System.out.println(beerNum + " " + word + "of beer on the wall");
			System.out.println(beerNum + " " + word + "of beer");
			System.out.println("take one down.");
			System.out.println("pass it around.");
			beerNum =beerNum -1;
			
			if(beerNum > 0 ) {
				System.out.println(beerNum + " " + word + "of beer on the wall");
			}	else {
				System.out.println("no more bottles of beer on the wall");
			}
				
		}
	}

}//YES   this is my first java program:
 

鄙人的程式輸出結果如下，供大家參考

99 bottlesof beer on the wall 99 bottlesof beer take one down. pass it around. 98 bottlesof beer on the wall 98 bottlesof beer on the wall 98 bottlesof beer take one down. pass it around. 97 bottlesof beer on the wall 97 bottlesof beer on the wall 97 bottlesof beer take one down. pass it around. 96 bottlesof beer on the wall 96 bottlesof beer on the wall 96 bottlesof beer take one down. pass it around. 95 bottlesof beer on the wall 95 bottlesof beer on the wall 95 bottlesof beer take one down. pass it around. 94 bottlesof beer on the wall 94 bottlesof beer on the wall 94 bottlesof beer take one down. pass it around. 93 bottlesof beer on the wall 93 bottlesof beer on the wall 93 bottlesof beer take one down. pass it around. 92 bottlesof beer on the wall 92 bottlesof beer on the wall 92 bottlesof beer take one down. pass it around. 91 bottlesof beer on the wall 91 bottlesof beer on the wall 91 bottlesof beer take one down. pass it around. 90 bottlesof beer on the wall 90 bottlesof beer on the wall 90 bottlesof beer take one down. pass it around. 89 bottlesof beer on the wall 89 bottlesof beer on the wall 89 bottlesof beer take one down. pass it around. 88 bottlesof beer on the wall 88 bottlesof beer on the wall 88 bottlesof beer take one down. pass it around. 87 bottlesof beer on the wall 87 bottlesof beer on the wall 87 bottlesof beer take one down. pass it around. 86 bottlesof beer on the wall 86 bottlesof beer on the wall 86 bottlesof beer take one down. pass it around. 85 bottlesof beer on the wall 85 bottlesof beer on the wall 85 bottlesof beer take one down. pass it around. 84 bottlesof beer on the wall 84 bottlesof beer on the wall 84 bottlesof beer take one down. pass it around. 83 bottlesof beer on the wall 83 bottlesof beer on the wall 83 bottlesof beer take one down. pass it around. 82 bottlesof beer on the wall 82 bottlesof beer on the wall 82 bottlesof beer take one down. pass it around. 81 bottlesof beer on the wall 81 bottlesof beer on the wall 81 bottlesof beer take one down. pass it around. 80 bottlesof beer on the wall 80 bottlesof beer on the wall 80 bottlesof beer take one down. pass it around. 79 bottlesof beer on the wall 79 bottlesof beer on the wall 79 bottlesof beer take one down. pass it around. 78 bottlesof beer on the wall 78 bottlesof beer on the wall 78 bottlesof beer take one down. pass it around. 77 bottlesof beer on the wall 77 bottlesof beer on the wall 77 bottlesof beer take one down. pass it around. 76 bottlesof beer on the wall 76 bottlesof beer on the wall 76 bottlesof beer take one down. pass it around. 75 bottlesof beer on the wall 75 bottlesof beer on the wall 75 bottlesof beer take one down. pass it around. 74 bottlesof beer on the wall 74 bottlesof beer on the wall 74 bottlesof beer take one down. pass it around. 73 bottlesof beer on the wall 73 bottlesof beer on the wall 73 bottlesof beer take one down. pass it around. 72 bottlesof beer on the wall 72 bottlesof beer on the wall 72 bottlesof beer take one down. pass it around. 71 bottlesof beer on the wall 71 bottlesof beer on the wall 71 bottlesof beer take one down. pass it around. 70 bottlesof beer on the wall 70 bottlesof beer on the wall 70 bottlesof beer take one down. pass it around. 69 bottlesof beer on the wall 69 bottlesof beer on the wall 69 bottlesof beer take one down. pass it around. 68 bottlesof beer on the wall 68 bottlesof beer on the wall 68 bottlesof beer take one down. pass it around. 67 bottlesof beer on the wall 67 bottlesof beer on the wall 67 bottlesof beer take one down. pass it around. 66 bottlesof beer on the wall 66 bottlesof beer on the wall 66 bottlesof beer take one down. pass it around. 65 bottlesof beer on the wall 65 bottlesof beer on the wall 65 bottlesof beer take one down. pass it around. 64 bottlesof beer on the wall 64 bottlesof beer on the wall 64 bottlesof beer take one down. pass it around. 63 bottlesof beer on the wall 63 bottlesof beer on the wall 63 bottlesof beer take one down. pass it around. 62 bottlesof beer on the wall 62 bottlesof beer on the wall 62 bottlesof beer take one down. pass it around. 61 bottlesof beer on the wall 61 bottlesof beer on the wall 61 bottlesof beer take one down. pass it around. 60 bottlesof beer on the wall 60 bottlesof beer on the wall 60 bottlesof beer take one down. pass it around. 59 bottlesof beer on the wall 59 bottlesof beer on the wall 59 bottlesof beer take one down. pass it around. 58 bottlesof beer on the wall 58 bottlesof beer on the wall 58 bottlesof beer take one down. pass it around. 57 bottlesof beer on the wall 57 bottlesof beer on the wall 57 bottlesof beer take one down. pass it around. 56 bottlesof beer on the wall 56 bottlesof beer on the wall 56 bottlesof beer take one down. pass it around. 55 bottlesof beer on the wall 55 bottlesof beer on the wall 55 bottlesof beer take one down. pass it around. 54 bottlesof beer on the wall 54 bottlesof beer on the wall 54 bottlesof beer take one down. pass it around. 53 bottlesof beer on the wall 53 bottlesof beer on the wall 53 bottlesof beer take one down. pass it around. 52 bottlesof beer on the wall 52 bottlesof beer on the wall 52 bottlesof beer take one down. pass it around. 51 bottlesof beer on the wall 51 bottlesof beer on the wall 51 bottlesof beer take one down. pass it around. 50 bottlesof beer on the wall 50 bottlesof beer on the wall 50 bottlesof beer take one down. pass it around. 49 bottlesof beer on the wall 49 bottlesof beer on the wall 49 bottlesof beer take one down. pass it around. 48 bottlesof beer on the wall 48 bottlesof beer on the wall 48 bottlesof beer take one down. pass it around. 47 bottlesof beer on the wall 47 bottlesof beer on the wall 47 bottlesof beer take one down. pass it around. 46 bottlesof beer on the wall 46 bottlesof beer on the wall 46 bottlesof beer take one down. pass it around. 45 bottlesof beer on the wall 45 bottlesof beer on the wall 45 bottlesof beer take one down. pass it around. 44 bottlesof beer on the wall 44 bottlesof beer on the wall 44 bottlesof beer take one down. pass it around. 43 bottlesof beer on the wall 43 bottlesof beer on the wall 43 bottlesof beer take one down. pass it around. 42 bottlesof beer on the wall 42 bottlesof beer on the wall 42 bottlesof beer take one down. pass it around. 41 bottlesof beer on the wall 41 bottlesof beer on the wall 41 bottlesof beer take one down. pass it around. 40 bottlesof beer on the wall 40 bottlesof beer on the wall 40 bottlesof beer take one down. pass it around. 39 bottlesof beer on the wall 39 bottlesof beer on the wall 39 bottlesof beer take one down. pass it around. 38 bottlesof beer on the wall 38 bottlesof beer on the wall 38 bottlesof beer take one down. pass it around. 37 bottlesof beer on the wall 37 bottlesof beer on the wall 37 bottlesof beer take one down. pass it around. 36 bottlesof beer on the wall 36 bottlesof beer on the wall 36 bottlesof beer take one down. pass it around. 35 bottlesof beer on the wall 35 bottlesof beer on the wall 35 bottlesof beer take one down. pass it around. 34 bottlesof beer on the wall 34 bottlesof beer on the wall 34 bottlesof beer take one down. pass it around. 33 bottlesof beer on the wall 33 bottlesof beer on the wall 33 bottlesof beer take one down. pass it around. 32 bottlesof beer on the wall 32 bottlesof beer on the wall 32 bottlesof beer take one down. pass it around. 31 bottlesof beer on the wall 31 bottlesof beer on the wall 31 bottlesof beer take one down. pass it around. 30 bottlesof beer on the wall 30 bottlesof beer on the wall 30 bottlesof beer take one down. pass it around. 29 bottlesof beer on the wall 29 bottlesof beer on the wall 29 bottlesof beer take one down. pass it around. 28 bottlesof beer on the wall 28 bottlesof beer on the wall 28 bottlesof beer take one down. pass it around. 27 bottlesof beer on the wall 27 bottlesof beer on the wall 27 bottlesof beer take one down. pass it around. 26 bottlesof beer on the wall 26 bottlesof beer on the wall 26 bottlesof beer take one down. pass it around. 25 bottlesof beer on the wall 25 bottlesof beer on the wall 25 bottlesof beer take one down. pass it around. 24 bottlesof beer on the wall 24 bottlesof beer on the wall 24 bottlesof beer take one down. pass it around. 23 bottlesof beer on the wall 23 bottlesof beer on the wall 23 bottlesof beer take one down. pass it around. 22 bottlesof beer on the wall 22 bottlesof beer on the wall 22 bottlesof beer take one down. pass it around. 21 bottlesof beer on the wall 21 bottlesof beer on the wall 21 bottlesof beer take one down. pass it around. 20 bottlesof beer on the wall 20 bottlesof beer on the wall 20 bottlesof beer take one down. pass it around. 19 bottlesof beer on the wall 19 bottlesof beer on the wall 19 bottlesof beer take one down. pass it around. 18 bottlesof beer on the wall 18 bottlesof beer on the wall 18 bottlesof beer take one down. pass it around. 17 bottlesof beer on the wall 17 bottlesof beer on the wall 17 bottlesof beer take one down. pass it around. 16 bottlesof beer on the wall 16 bottlesof beer on the wall 16 bottlesof beer take one down. pass it around. 15 bottlesof beer on the wall 15 bottlesof beer on the wall 15 bottlesof beer take one down. pass it around. 14 bottlesof beer on the wall 14 bottlesof beer on the wall 14 bottlesof beer take one down. pass it around. 13 bottlesof beer on the wall 13 bottlesof beer on the wall 13 bottlesof beer take one down. pass it around. 12 bottlesof beer on the wall 12 bottlesof beer on the wall 12 bottlesof beer take one down. pass it around. 11 bottlesof beer on the wall 11 bottlesof beer on the wall 11 bottlesof beer take one down. pass it around. 10 bottlesof beer on the wall 10 bottlesof beer on the wall 10 bottlesof beer take one down. pass it around. 9 bottlesof beer on the wall 9 bottlesof beer on the wall 9 bottlesof beer take one down. pass it around. 8 bottlesof beer on the wall 8 bottlesof beer on the wall 8 bottlesof beer take one down. pass it around. 7 bottlesof beer on the wall 7 bottlesof beer on the wall 7 bottlesof beer take one down. pass it around. 6 bottlesof beer on the wall 6 bottlesof beer on the wall 6 bottlesof beer take one down. pass it around. 5 bottlesof beer on the wall 5 bottlesof beer on the wall 5 bottlesof beer take one down. pass it around. 4 bottlesof beer on the wall 4 bottlesof beer on the wall 4 bottlesof beer take one down. pass it around. 3 bottlesof beer on the wall 3 bottlesof beer on the wall 3 bottlesof beer take one down. pass it around. 2 bottlesof beer on the wall 2 bottlesof beer on the wall 2 bottlesof beer take one down. pass it around. 1 bottlesof beer on the wall 1 bottlesof beer on the wall 1 bottlesof beer take one down. pass it around. no more bottles of beer on the wall