单项选择题
在J2EE中,对于我们自己设计的Bean,应该()。
A.一定要继承java.beans.Beans
B.一定要实现Runnalbe接口
C.一定要继承java.lang.Thread类
D.可以不继承java.beans.Beans
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相关考题
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多项选择题
在J2EE中,下面代码中,()不会编译错误。
A.File f = new File("/","autoexec.bat");
B.DataInputStream din = new DataInputStream(new FileInputStream("autoexec.bat"));
C.InputStreamReader in = new InputStreamReader(System.in);
D.OutputStreamWriter out = new OutputStreamWriter(System.in); -
单项选择题
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()。
A.No such file found
B.No such file found -1
C.No such file found doing finally -1
D.0 -
单项选择题
在J2EE中,某一java程序中有如下代码: DataInputStream din = new DataInputStream(new BufferedInputStream (new FileInputStream("employee.dat"))); System.out.print(din.readByte()); 假设在employee.dat文件中只有如下一段字符:abcdefg。则:System.out在屏幕上打印( )。
A.a
B.b
C.97
D.98
