在J2EE中,假如在当前目录下不存在employee.txt文件。在当前目录下的一个类文件的main函数只包含如下代码:try{//1PrintWriterout=newPrintWriter(newFileOutputStream(employee.txt”));//2Stringname=jb-aptech”;//3doublesalary=75000;//4out.print(name);//5out.print(‘‘);//6out.println(salary);//7}//8catch(Exceptione)//9System.out.println(文件没有发现!);//10在DOS控制台上编译并且运行该类文件。下面的描述正确的是()。A.使用java命令运行该类文件,将在控制台上打印:文件没有发现!B.运行结束后打开employee.txt,会发现该文件什么也没有C.运行结束后打开employee.txt,会发现文件中有这样的文本:“jb-aptech75000”D.在第7行后加上代码:out.close(),编译并运行该类文件后,打开employee.txt,才会发现文件中有这样的文本:“jb-aptech75000.0”E.把第2行代码改为:PrintWriterout=newPrintWriter(newFileOutputStream(“employee.txt”),true);编译并运行该类文件后,打开employee.txt,才会发现文件中有这样的文本:“jb-aptech75000.0”
在J2EE中,加入在当前目录下不存在employee.txt文件。在当前目录下的一个类文件的main函数只包含如下代码:try{//1PrintWriterout=newPrintWriter(newFileOutputStream(employee.txt”));//2Stringname=”jb-aptech”;//3doublesalary=75000;//4out.print(name);//5out.print(??);//6out,print(salary);//7}//8catch(Exceptione){//9System.out.println(文件没有被发现!”);//10}//11在DOS控制台上编译并运行该类文件。下面描述正确的是()。
请完成下列Java程序。程序的功能是显示用户在命令行方式下指定的任意驱动器文件夹的内容。提示:public string()list();//将文件夹中所有文件名保存在字符数组中返回。注意:请勿改动main()主方法和其他已有的语句内容,仅在下划线处填入适当的语句。源程序文件代码清单如下:import java.io.*;public class FindDirectories{public static void main(String args[]){if(args.length==0)args=new String(){".."};try{______;String[] fileName=pathName.list();for(int i=0;i<fileName.length;i++){File f=new File(pathName.getPath(),fileName[i]);if(______){System.out.println(f.getCanonicalPath());main(new String[]{f.getPath()});}}}catch(IOException e){e.printStackTrace();}}}
请完成下列Java程序。程序的功能是复制文件并显示文件,将每个字符读入,并写入另一个文件,同时显示出来(注意:在本题中,当前目录下的README.txt文件打印在屏幕上,并写入另一个文件temp.txt中)。注意:请勿改动main()主方法和其他已有的语句内容,仅在下画线处填人适当的语句。import java.io.*;public class FileCopyBy{public static void main(String args[]){try{FileReader input=new FileReader("README.txt");FileWriter utput=new FileWriter("temp.txt");int c=input.read();while(__________){__________System.out.print((char)c);c=input.read();}input.close();output.close();}catch(IOException e){System.out.println(e);}}}
在程序中,用户输入一个文件名,根据用户输入显示相应文件的信息。注意:请勿修改main()主方法和其他已有语句内容,仅在横线处填入适当语句。______java.io.*;public class basic{public static void main(String[] args){InputStreamReader reader;BufferedReader in;System.out.println("请输入文件名: ");try{reader=new InputStreamReader(______);in=new BufferedReader(reader);String filename=in.readLine();File file=new File(filename);System.out.println("文件名:"+file.______);System.out.println("路径:"+file.getAbsolutePath());System.out.println("大小:"+file.length());}catch(Exception e){e.printStackTrace();}}}
下列程序执行后的结果是______。 package ch1; import java.io.*; public class ex22 { static, String filename = "ch1\kfile22.txt"; public static void main(String[] args) { try { FileWriter fr = new FileWriter(filename); PrintWriter pr = new PrintWriter(fr); String name = "xiaoming"; String phone = "123456"; String age = "12"; pr.println(name + ',' + phone + ',' + age); pr.close(); fr.close(); } catch(IOException ioe) { ioe.printStackTrace() } } }A.在包ch1 中新建一个文件file22.txt, 并且在其中写入一行字符串“xiaomingl2345612”B.在包ch1中新建一个文件file22.txt,并且在其中写入一行字符串“xiaoming, 123456,12”C.在包chi中新建一个文件file22.txt,并且在其中写入一行字符串“xiaoming'’D.抛出IOException
下列程序的运行结果是______。 package ch1; import java.io. *; public class ex28 { public static void main (String args [] ) throws IOException { try { File f1 = new File("ch1\\dir28"); f1.mkdir(); File f2 = new File(f1, "file59.txt"); FileOutputStream fos = new FileOutputStream(f2); for(int i = 0; i < 2; i++) { String s= i + "times"; byte[] b = s.getBytes(); fos.write(b,0,b.length); } } catch(IOException ioe) { ioe.printStackTrace(); } } }A.在目录ch1下建立一个目录dir28,并且建立文件file28.txt,在文件中写入"Otimes 1 times"B.在目录ch1下建立一个目录dir28,并且建立文件file28.txt,在文件中写入“l times”C.在目录chi下建立一个目录dir28,并且建立文件file28.txt,在文件中写入“Otimes”D.抛出IOExceptin异常
创建一个向文件“file.txt”追加内容的输出流对象的语句有()。A、FileOutputStream out=new FileOutputStream(“file.txt”,true);B、OutputStream out=new FileOutputStream(“file.txt”,“append”);C、OutputStream out=new FileOutputStream(“file.txt”);D、FileOutputStream out=new FileOutputStream(new file(“file.txt”));E、OutputStream out=new FileOutputStream(new File(“file.txt”),true.;
在J2EE中,加入在当前目录下不存在employee.txt文件。在当前目录下的一个类文件的 main函数只包含如下代码: try{ //1 PrintWriter out=new PrintWriter(new FileOutputStream(“employee.txt”));//2 String name=”jb-aptech”; //3 double salary=75000; //4 out.print(name); //5 out.print(„ „); //6 out,print(salary); //7 } //8 catch(Exception e) { //9 System.out.println(“文件没有被发现!”); //10 } //11 在DOS控制台上编译并运行该类文件。下面描述正确的是()。 A、使用java命令运行该类文件,将在控制台上打印:”文件没有发现!”;B、运行结束后打开employee.txt,会发现该文件什么都没有C、运行结束后打开employee.txt,会发现该文件中有这样的文本:”jb-aptech 75000”D、在第7行后加上代码:out.close (),编译并运行后,打开打开employee.txt,才会发现该文件中有这样的文本:”jb-aptech 75000.0”
在J2EE中,利用下列构造函数准备对文件abc.txt操作,但文件abc.txt在当前目录不存在,不会产生运行时错误的是()。 A、BufferedReader breader=new BufferedReader(new FileReader("abc.txt"));B、PrintWriter out = new PrintWriter(new FileWriter(“abc.txt”),true);C、FileInputStream fin = new FileInputStream(“abc.txt”);D、OutputStreamWriter out = new OutputStreamWriter(new FileOutputStream(“abc.txt”));
在J2EE中,Servlet1的代码如下: import javax.servlet.*; import javax.servlet.http.*; import java.io.*; public class Servlet1 extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); String aa=request.getQueryString(); String bb=request.getMethod(); out.println(aa); out.println(bb); } } 把Servlet1.class文件放在Web服务器适合的目录下,在浏览B器地址栏内输入:http://localhost:8080/servlet/Servlet1?name=jb-aptechphone=12345678,看到的结果是()。 A、name=jb-aptechphone=12345678 GETB、name=jb-aptech,phone=12345678 GETC、jb-aptech,12345678 POSTD、name,phone GETE、2,POST
//point X public class foo ( public static void main (String[]args) throws Exception { printWriter out = new PrintWriter (new java.io.outputStreamWriter (System.out), true; out.printIn(“Hello”); } ) Which statement at PointX on line 1 allows this code to compile and run?() A、 Import java.io.PrintWriter;B、 Include java.io.PrintWriter;C、 Import java.io.OutputStreamWriter;D、 Include java.io.OutputStreamWriter;E、 No statement is needed.
在J2EE中,如果去编译并运行下面的代码,在这里假定在当前目录下没有Hello.txt文件: import java.io.*; public class Mine { public static void main(String argv[]){ Mine m=new Mine(); System.out.println(m.amethod()); } public int amethod() { try { FileInputStream dis=new FileInputStream("Hello.txt"); } catch (FileNotFoundException fne) { System.out.println("No such file found"); return -1; } catch(IOException ioe) { } finally { System.out.println("Doing finally"); } return 0; } } 结果会输出()。 A、No such file foundB、No such file found -1C、No such file found doing finally -1D、0
在J2EE中,假如在当前目录下不存在employee.txt文件。在当前目录下的一个类文 件的main函数只包含如下代码: try{ //1 PrintWriter out =new PrintWriter(new FileOutputStream(“employee.txt”)); //2 String name = “jb-aptech”; //3 double salary = 75000; //4 out.print(name); //5 out.print(“ ”); //6 out.println(salary); //7 } //8 catch(Exception e) { //9 System.out.println(“文件没有发现!”); //10 } //11 在DOS控制台上编译并且运行该类文件。下面的描述正确的是()。 A、使用java命令运行该类文件,将在控制台上打印:”文件没有发现!”B、运行结束后打开employee.txt,会发现该类文件什么也没有C、运行结束打开employee.txt,会发现文件中有这样的文本:“jb-aptech 75000”D、在第7行后加上:out.close(),编译并运行该文件后,打开employee.txt,会发现文件中有这样的文本:“jb-aptech 75000.0”E、把第2行代码改为:PrintWriter out = PrintWriter(new File
//point X public class foo { public static void main (String[]args) throws Exception { java.io.printWriter out = new java.io.PrintWriter { new java.io.outputStreamWriter (System.out), true; out.printIn(“Hello”); } } } Which statement at PointX on line 1 allows this code to compile and run?() A、 Import java.io.*;B、 Include java.io.*;C、 Import java.io.PrintWriter;D、 Include java.io.PrintWriter;E、 No statement is needed.
//point X public class foo { public static void main (Stringargs) throws Exception { java.io.printWriter out = new java.io.PrintWriter { new java.io.outputStreamWriter (System.out), true; out.printIn(“Hello”); } } } Which statement at PointX on line 1 allows this code to compile and run?() A、 Import java.io.*;B、 Include java.io.*;C、 Import java.io.PrintWriter;D、 Include java.io.PrintWriter;E、 No statement is needed.
//point X public class foo ( public static void main (Stringargs) throws Exception { printWriter out = new PrintWriter (new ) java.io.outputStreamWriter (System.out), true; out.printIn(“Hello”); } ) Which statement at PointX on line 1 allows this code to compile and run?()A、 Import java.io.PrintWriter;B、 Include java.io.PrintWriter;C、 Import java.io.OutputStreamWriter;D、 Include java.io.OutputStreamWriter;E、 No statement is needed.
多选题在J2EE中,利用下列构造函数准备对文件abc.txt操作,但文件abc.txt在当前目录不存在,不会产生运行时错误的是()。ABufferedReader breader=new BufferedReader(new FileReader(abc.txt));BPrintWriter out = new PrintWriter(new FileWriter(“abc.txt”),true);CFileInputStream fin = new FileInputStream(“abc.txt”);DOutputStreamWriter out = new OutputStreamWriter(new FileOutputStream(“abc.txt”));
多选题在J2EE中,加入在当前目录下不存在employee.txt文件。在当前目录下的一个类文件的 main函数只包含如下代码: try{ //1 PrintWriter out=new PrintWriter(new FileOutputStream(“employee.txt”));//2 String name=”jb-aptech”; //3 double salary=75000; //4 out.print(name); //5 out.print(„ „); //6 out,print(salary); //7 } //8 catch(Exception e) { //9 System.out.println(“文件没有被发现!”); //10 } //11 在DOS控制台上编译并运行该类文件。下面描述正确的是()。A使用java命令运行该类文件,将在控制台上打印:”文件没有发现!”;B运行结束后打开employee.txt,会发现该文件什么都没有C运行结束后打开employee.txt,会发现该文件中有这样的文本:”jb-aptech 75000”D在第7行后加上代码:out.close (),编译并运行后,打开打开employee.txt,才会发现该文件中有这样的文本:”jb-aptech 75000.0”
多选题在J2EE中,假如在当前目录下不存在employee.txt文件。在当前目录下的一个类文件的main函数只包含如下代码: try { PrintWriter out = new PrintWriter(new FileOutputStream(“employee.txt”)); String name = “jb-aptech”; double salary = 75000; out.print(name); out.print(„ „); out.println(salary); } catch(Exception e) System.out.println("文件没有发现!"); 在DOS控制台上编译并且运行该类文件。下面的描述正确的是()。A使用java命令运行该类文件,将在控制台上打印:文件没有发现!B运行结束后打开employee.txt,会发现该文件什么也没有C运行结束后打开employee.txt,会发现文件中有这样的文本:“jb-aptech 75000”D在第7行后加上代码:out.close(),编译并运行该类文件后,打开employee.txt,才会发现文件中有这样的文本:“jb-aptech 75000.0”E把第2行代码改为: PrintWriter out = new PrintWriter(new FileOutputStream(“employee.txt”),true); 编译并运行该类文件后,打开employee.txt,才会发现文件中有这样的文本:“jb-aptech 75000.0”
单选题在J2EE中,Servlet1的代码如下: import javax.servlet.*; import javax.servlet.http.*; import java.io.*; public class Servlet1 extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); String aa=request.getQueryString(); String bb=request.getMethod(); out.println(aa); out.println(bb); } } 把Servlet1.class文件放在Web服务器适合的目录下,在浏览B器地址栏内输入:http://localhost:8080/servlet/Servlet1?name=jb-aptechphone=12345678,看到的结果是()。Aname=jb-aptechphone=12345678 GETBname=jb-aptech,phone=12345678 GETCjb-aptech,12345678 POSTDname,phone GETE2,POST
多选题在J2EE中,假如在当前目录下不存在employee.txt文件。在当前目录下的一个类文 件的main函数只包含如下代码: try{ //1 PrintWriter out =new PrintWriter(new FileOutputStream(“employee.txt”)); //2 String name = “jb-aptech”; //3 double salary = 75000; //4 out.print(name); //5 out.print(“ ”); //6 out.println(salary); //7 } //8 catch(Exception e) { //9 System.out.println(“文件没有发现!”); //10 } //11 在DOS控制台上编译并且运行该类文件。下面的描述正确的是()。A使用java命令运行该类文件,将在控制台上打印:”文件没有发现!”B运行结束后打开employee.txt,会发现该类文件什么也没有C运行结束打开employee.txt,会发现文件中有这样的文本:“jb-aptech 75000”D在第7行后加上:out.close(),编译并运行该文件后,打开employee.txt,会发现文件中有这样的文本:“jb-aptech 75000.0”E把第2行代码改为:PrintWriter out = PrintWriter(new File
多选题创建一个向文件“file.txt”追加内容的输出流对象的语句有()。AFileOutputStream out=new FileOutputStream(“file.txt”,true);BOutputStream out=new FileOutputStream(“file.txt”,“append”);COutputStream out=new FileOutputStream(“file.txt”);DFileOutputStream out=new FileOutputStream(new file(“file.txt”));EOutputStream out=new FileOutputStream(new File(“file.txt”),true.;
单选题//point X public class foo { public static void main (Stringargs) throws Exception { java.io.printWriter out = new java.io.PrintWriter { new java.io.outputStreamWriter (System.out), true; out.printIn(“Hello”); } } } Which statement at PointX on line 1 allows this code to compile and run?()A Import java.io.*;B Include java.io.*;C Import java.io.PrintWriter;D Include java.io.PrintWriter;E No statement is needed.
单选题//point X public class foo { public static void main (String[]args) throws Exception { java.io.printWriter out = new java.io.PrintWriter { new java.io.outputStreamWriter (System.out), true; out.printIn(“Hello”); } } } Which statement at PointX on line 1 allows this code to compile and run?()A Import java.io.*;B Include java.io.*;C Import java.io.PrintWriter;D Include java.io.PrintWriter;E No statement is needed.
多选题在J2EE中,假如在当前目录下不存在employee.txt文件。在当前目录下的一个类文件的main函数只包含如下代码: try{//1 PrintWriterout=newPrintWriter(newFileOutputStream(“employee.txt”));//2 Stringname=“jb-aptech”;//3 doublesalary=75000;//4 out.print(name);//5 out.print(‘‘);//6 out.println(salary);//7 }//8 catch(Exceptione)//9 System.out.println("文件没有发现!");//10 在DOS控制台上编译并且运行该类文件。下面的描述正确的是()。A使用java命令运行该类文件,将在控制台上打印:文件没有发现!B运行结束后打开employee.txt,会发现该文件什么也没有C运行结束后打开employee.txt,会发现文件中有这样的文本:“jb-aptech75000”D在第7行后加上代码:out.close(),编译并运行该类文件后,打开employee.txt,才会发现文件中有这样的文本:“jb-aptech75000.0”E把第2行代码改为:PrintWriterout=newPrintWriter(newFileOutputStream(“employee.txt”),true);编译并运行该类文件后,打开employee.txt,才会发现文件中有这样的文本:“jb-aptech75000.0”
单选题在J2EE中,如果去编译并运行下面的代码,在这里假定在当前目录下没有Hello.txt文件: import java.io.*; public class Mine { public static void main(String argv[]){ Mine m=new Mine(); System.out.println(m.amethod()); } public int amethod() { try { FileInputStream dis=new FileInputStream("Hello.txt"); } catch (FileNotFoundException fne) { System.out.println("No such file found"); return -1; } catch(IOException ioe) { } finally { System.out.println("Doing finally"); } return 0; } } 结果会输出()。ANo such file foundBNo such file found -1CNo such file found doing finally -1D0