1、東北石油大學計算機與信息技術學院李勇勇java練習代碼bookstestdrive.javaclass books(string title;string author;) public class bookstestdrive(public static void main(string args)(books mybooks = new books3;mybooks0 = new books();倉建 books 的 對象mybooksl = new books();mybooks=new books();int x = 0;my books 0. title = nenglishn;my

2、 books 1. title = math;my books 2. title = chinese;mybooks0.author = mark;mybooksl.author = tina”；mybooks2eauthor = peter;while(x3)|system.out.print(mybooksx.title +by + mybooksx.author);system.out.println(n )；x = x + 1;)dog.javapublic class dogstring name;/變量有兩種:基本數據類型和引用數據類型；變量聲明時必須要有類型和名稱public s

3、tatic void main(string args)創建dog對象dog dogl = new dog(); dogl.bark(); = mark;創建dog數組dog mydogs = new dog3;數組也屬于對象，數組的引用既是對象的引用mydogs0 = new dog(); mydogsl = new dog();mydogs2 = dogl;通過數組引用存取dog = ntinan; = peter;/dog2的名字？sy stem.out.println(1 * what is the dog2fs

4、name?);system.out.println();對dog逐個執行bark()方法int x = 0;while(xmydogs.length)(mydogsx.bark();x = x + 1;public void bark()system.out.println(name + mwang wang!n); ) ) dogtestdrive.java public class dogtestdrivepublic static void main(string args)dog d = new dog();建立一個 dog 對象desize = 40;deba

5、rk();)class dog(int size;string breed;string name;void bark()system.out.println(hyou are a fool dog!) )doobee.javapublic class doobee(public static void main(string args)(int x=l;while(x 3)sy stem.out.print(f f doo);sy stem.out.print(h bee n);x+;)if(x=3)sy stem.outprint (n do n);)drumkittestdrive.j

6、ava class drumkit (boolean tophat = true;boolean snare = true;void playtophat() (system.out.println(1 fding ding da-ding);)void playsnare()(system.out.println(hbang bang ba-bangn);)class drumkittestdrive(public static void main(string args)(drumkit d = new drumkit();d.snare = false;d.playsnare();d.p

7、laytophat();if(d.snare = true)(d.playsnare();)echotestdrive.j avapublic class echotestdrive(public static void main(string args)(echo el = new echo();echo e2 = new echo();int x = 0;while(x0)(e2.count = e2.count + el.count;)x = x + 1;)system.out.println(e2.count);)class echoint count = 0;void hello()

8、(sy stem.out.println(1 f heloooo.n);)gamelauchenj avaclass guessgameplayer pl;創建3個實例變量player對象player p2;player p3;public void startgame()創建 startgame 的方法(pl = new player();p2 = new player();p3 = new player();int guesspl=o;用三個變量聲明是否數字被猜中int guessp2=0;int guessp3=0;boolean plisright = false;聲明三個變量來保存猜

9、測的數字boolean p2isright = false;boolean p3isright = false;inttargetnumber=(int)(math.random()*10);system.out.println(1 fi am thinking of a number is:while(true)(system.out.println(1 fnumber to guss is” +targetnumber);plguess();調用 player 的 guess 方法p2.guess();p3.guess();10東北石油大學計算機與信息技術學院李勇勇guesspl = pl

10、.mimber; 取出猜的數字并 且羅列出來system.out.println(1 fplayer one gussedh + guesspl);guessp2 = p2.number;sy stem.out.println(1 * player two gussedn + guessp2);guessp3 = p3.number;sy stem.out.println(1 f playerthreegussedn + guessp3);if(guesspl=targetnumber)/lj 斷所猜的 數字是否和目標數字相等(plisright = true;)if(guessp2=targ

11、etnumber) (p2isright = true;if(guessp3=targetnumber)( p3isright = true;)if(p lisright i ip2isrightl ip3isright)(sy stem.out.println(t1 wehave awinner!h);system.out.println(t fplayer one got it right?” + p lisright);system.out.println(t1 player two got it right?” + p2isright);system.out.println(mplay

12、er three got it right?” + p3isright);system.out.println(11 game is over!);break;/游戲結束終止循環 else system.out.println(f fthe game we will come on!);)東北石油大學計算機與信息技術學院李勇勇)class player(int number = 0;要被猜的數字public void guess()(number = (int)(mathrandom()*10);利用 隨機函數產生隨機數sy stem.out.println(f 11 am guessing

13、the number is + number);)/主方法public class gamelaucher(public static void main(string args)guessgame game = new guessgame();倉！j 建gussgame的對象gamegame.startgame() ;/game 對象調用 startgame的方法，開始執行游戲)helloworld.j avapublic class helloworld(public static void main(string args)system.out.println(h helloworld

14、);)hobbits.javapublic class hobbits(string name;public static void main(string args)(hobbits h = new hobbits3;int z = -1;while(z2)(z = z + 1;hz = new hobbits(); = bilbo;if(z=l)( = mark;)if(z=2)( = tina;)sy stem.out.println(hz .name + + is a good hobbits name!);)iftest.javapubli

15、c class iftest15東北石油大學計算機與信息技術學院李勇勇public static void main(string args)(int x=3;if(x=3)system.out.println(1 fx must be 3n);)system.out.println(1 fthis runs no matter what!”)； ) iftest2.java public class iftest2 (public static void main(string args)(int x=2;if(x=3)system.out.println(1 fx must be 3n);

16、 else system.outprintln(mx is not 3);)東北石油大學計算機與信息技術學院李勇勇system.out.println(1 fthis runs no matter what!”)；)jiecheng.javapublic class jiecheng(public static void main(string args)long result = 0;long f = 1;for(int i=l;i10;i+)result += f;system.out.println(111 至1 10 的階乘之和為:+result);)loopy.javapublic

17、class loopy(public static void main(string args)(int x=l;system.out.println(hbefore the loop);while(x4)(system.out.println(11 in the loop);system.out.println(hvalue of x is n + x); x=x+l;)sy stem.out.println(1 * this is after the loop);)oddsum.javapublic class oddsum(public static void main(string a

18、rgs)long result = 0;for(int i=l;i0)(if(x2) system.out.print(h a n);x=x-l;sy stem.out.print(n -h);if(x=2) sy stem. out. print。b cn);x=x-l;sy stem.out.print(n -h);if(x=1) system.out.print(hdn); x=x-l;)sum.javapublic class sum(public static void main(string args)(long result = 0;for(int i=l;i100;i+)res

19、ult += i;)system.out.println(h 1 到 99 的和 是:+result);) ) test.java public class test (public static void main(string args)(int num = 0,i = 1;while(i100)if(i%3=0) sy stem.out.println(n i=n+i); num+;)if(num = 5) break;i+;)testarrays.javapublic class testarrays(public static void main(string args)(string islands = new st ring 4;int index = new int4;int y = 0;islands0 = bermuda”;islandsl = fiji;islands2 = azores;islands3 = coz