一些简单的java代码

参考链接： Java简单程序

1.

 public class Beersong {

 public static void main (String[] args){

int beernum =99;

String word = "bottle";

while (beernum>0){

if (beernum == 1){

word = "bootle";

}

System.out.print(beernum+""+word+"of beer on the wall");

System.out.println(beernum+""+"of beer");

System.out.println("Take one down.");

System.out.println("passit around.");

beernum = beernum -1;

   if (beernum>0); {

 System.out.println(beernum+""+"of beer on wall");

   }

   {

 System.out.println("No more bottles of beer on the wall");

   }

 }

 }         

} 

2.class Books{ String title; String author; } class BookTestDrive { public static void main(String args[]){ Books[] myBooks = new Books[3]; int x = 0; //创建books对象 myBooks[0]=new Books(); myBooks[1]=new Books(); myBooks[2]=new Books();  myBooks[0].title="The Grapes of Java"; myBooks[1].title="The Java Gatsby"; myBooks[2].title="The Java Cookbook";  myBooks[0].author="bob"; myBooks[1].author="sue"; myBooks[2].author="ian";  while(x<3){ System.out.println(myBooks[x].title); System.out.println("by"); System.out.println(myBooks[x].author); x=x+1; } }   } 

3.class Cat{ int size;  String name; void bark(){ if(size>60){ System.out.println("Woof!Woof!"); }else if(size>14){ System.out.println("Ruff!Ruff!"); }else{ System.out.println("Yip!Yip!"); }  } } class DogTestDrive { public static void main(String[] args){ Cat one = new Cat(); one.size = 70; Cat two = new Cat(); two.size = 8; Cat three =  new Cat(); three.size = 35;  one.bark(); two.bark(); three.bark(); } } 

4.//编写类 class Movie{ //实例对象 String title; String genre; int rating; //方法 void playIt(){     System.out.println("Playing the movie");   } } public class MovieTestDrive { //编写测试用的类    public static void main(String[] args){   //建立movie对象   Movie one = new Movie();   //圆点运算符引用   one.title = "Gone with the Stock";   one.genre = "Tragic";   one.rating = -2;      //建立movie对象   Movie two = new Movie();   two.title = "Lost in Cubicle Space";   two.genre = "Comedy";   two.rating = 5;  //调用方法   two.playIt();       }   } 

5.   public class SimpleDotCom { int[] locationCells; int numOfHits = 0;   public void setLocationCells(int[] locs){ locationCells = locs; }   public String checkYourself(String StringGuess) { int guess = Integer.parseInt(StringGuess); String result = "miss"; for (int cell:locationCells){ if (guess == cell){ result = "hit"; numOfHits++; break; } } if(numOfHits == locationCells.length){ result = "kill"; } System.out.println(result); return result; }   } 

  public class SimpleDotComTestDrive {   public static void main(String[] args){  //初始化一个SimpleDotCom对象  SimpleDotCom dot = new SimpleDotCom();  //创建带有dot com位置的数组  int[] locations = {2,3,4};  //调用dot com 的setter  dot.setLocationCells(locations);  //假的猜测  String userGuess = "2";  //调用被测方法并传入假的数据  String result = dot.checkYourself(userGuess);     } }