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java基础测试

                  编写两个方法分别计算组合数n!.&nbsp;一个使用递归方法实现，另一个不用递归方法。（10分）<BR>4、 
                  编写一个程序，在控制台接收数据，程序会让用户输入名字，并检查用户的输入：不允许输入空名字：<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
                  一旦用户完成输入，程序会向该用户发出问候：“Hello,你输入的名字。”<BR><BR>（提示：如果希望在控制台中与<BR>用户交互，一种可能的做法就是将System.in包装成BufferedReader&nbsp;要做到这一点，必须使用<BR>InputStreamReader类将System.in这个InputStream对象转换成一个Reader&nbsp;&nbsp;<BR>即BufferedReader&nbsp;in=new&nbsp;BufferedReader(new&nbsp;InputStreamReader(System.in));</P>
                  <P>参考答案：</P>
                  <P>第一大题：选择题（60分）<BR>1、B&nbsp;&nbsp;&nbsp;2、D&nbsp;&nbsp;3、C&nbsp;&nbsp;4、B&nbsp;&nbsp;5、C&nbsp;&nbsp;6、A&nbsp;&nbsp;7、C&nbsp;&nbsp;8、A&nbsp;&nbsp;9、D&nbsp;&nbsp;10、B<BR>11、A&nbsp;&nbsp;12、AC&nbsp;&nbsp;13、A&nbsp;&nbsp;14、AD&nbsp;&nbsp;15、AB&nbsp;&nbsp;16、A&nbsp;&nbsp;17、B&nbsp;&nbsp;18、A&nbsp;&nbsp;19、D&nbsp;&nbsp;20、AB<BR>第二大题：<BR>1、public&nbsp;class&nbsp;Sum{<BR>public&nbsp;static&nbsp;void&nbsp;main(String&nbsp;args[])<BR>{<BR>int&nbsp;i=1;<BR>int&nbsp;sum=0;<BR>for(i=1;i&lt;=100;i=i+2)<BR>{sum=sum+I;}<BR>System.out.println("1+3+5+.....+99="+sum);<BR>}<BR>}<BR>2、import&nbsp;java.io.*;<BR>public&nbsp;class&nbsp;read{<BR>public&nbsp;static&nbsp;void&nbsp;main(String&nbsp;args[])<BR>throws&nbsp;IOException{<BR>char&nbsp;c;<BR>BufferedReader&nbsp;br=new&nbsp;BufferedReader(new&nbsp;InputStreamReader(System.in));<BR>System.out.println("请输入字符,输入'e'或者'E'退出."）<A 
                  href="file:///C:/Documents%20and%20Settings/Administrator/桌面/java/JAVA第一次模拟考试答案.files/wink.gif" 
                  target=_blank></A>;<BR>do{<BR>c=(char)br.read();<BR>System.out.println(c);<BR>}while(c!='e'&nbsp;&amp;&amp;&nbsp;c!='E');<BR>}<BR>}<BR><BR><BR>3、public&nbsp;class&nbsp;Fact{<BR>public&nbsp;static&nbsp;void&nbsp;main(String&nbsp;args[])<BR>{<BR>System.out.println("5!&nbsp;=&nbsp;"+fact1(5));<BR>System.out.println("4!&nbsp;=&nbsp;"+fact2(4));<BR>}<BR>public&nbsp;static&nbsp;int&nbsp;fact1(int&nbsp;n)<BR>{<BR>//递归方法<BR>if(n==0)<BR>return&nbsp;1;<BR>else&nbsp;<BR>return&nbsp;n*fact1(n-1);<BR>}<BR>public&nbsp;static&nbsp;int&nbsp;fact2(int&nbsp;n)<BR>{<BR>//非递归方式<BR>int&nbsp;ret=n;<BR>for(int&nbsp;i=1;i&lt;n;i++)<BR>ret=ret*i;<BR>return&nbsp;ret;<BR>}<BR>}<BR><BR><BR>4、import&nbsp;java.io.*;<BR>public&nbsp;class&nbsp;ConsoleInput{<BR>&nbsp; 
                  public&nbsp;static&nbsp;void&nbsp;main(String&nbsp;args[])throws&nbsp;IOException{<BR>&nbsp;&nbsp;&nbsp; 
                  BufferedReader&nbsp;in=new&nbsp;BufferedReader(new&nbsp;InputStreamReader(System.in));<BR>&nbsp;&nbsp;&nbsp; 
                  System.out.println("Enter&nbsp;your&nbsp;name:");<BR>&nbsp;&nbsp;&nbsp; 
                  String&nbsp;name=in.readLine();<BR>&nbsp;&nbsp;&nbsp; 
                  while(name.trim().length()==0){<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
                  System.out.println("Enter&nbsp;your&nbsp;name:")<A 
                  href="file:///C:/Documents%20and%20Settings/Administrator/桌面/java/JAVA第一次模拟考试答案.files/wink.gif" 
                  target=_blank></A>;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
                  name=in.readLine();<BR>&nbsp;&nbsp;&nbsp;&nbsp; 
                  }<BR>&nbsp;&nbsp; 
                  System.out.println("Hello,"+name.trim());<BR>&nbsp;&nbsp;&nbsp; 
                  in.close();<BR>}<BR>}<BR></P>
                  <P><BR></P></TD></TR></TBODY></TABLE>
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