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
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
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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()。
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多选题现有: class Waiting implements Runnable { boolean flag=false; public synchronized void run() { if (flag) { flag=false; System.out.print ("1"); try { this.wait(); ) catch (Exception e) { } System.out.print ("2"); } else { flag=true; System.out.print ("3"); try{Thread.sleep (2000); } catch(Exception e) {} System.out.print ("4"); notify(); } } public static void main (String [] args) { Waiting w=new Waiting(); new Thread (w) .start(); new Thread (w) .start(); } } 以下哪两项是正确的?()A代码输出l 3 4B代码输出3 4 1C代码输出l 2 3 4D代码输出1 3 4 2E代码运行完毕F代码不会完成
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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”
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