单项选择题

下列程序的输出结果是______。 class T44 implements Runnable { public void run() { System.out.print in (Thread.currentThread ( ).getName ( ) + "运行" ); } } public class ex44 { public static void main(String[] args) { Thread t1 = new Thread(new T44(), "t1"); Thread t2 = new Thread(new T44 () , "t2"); t1.setPriority(Thread. MAX_PRIORITY); t2.setPriority(Thread.MIN_PRIORITY); t2. start (); t1.start (); } }

A．t1 运行 t2 运行
B．t2 运行 t1 运行
C．t1 运行 t1 运行
D．t2 运行 t2 运行

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单项选择题

下列代码实现从文件file.dat中读出第5个字节到变量c中，横线处应该填入下列项中的______。 import java.io.*; public class exl5 { public static void main(String[] args) { try System.out.println((char)c); catch(Exception e) { e.printStackTrace(); } } }

A．FileInputStream in = new FileInputStream("chl/fildat"); iskip(4); int c = iread();
B．FileInputStream in = new FileInputStream("chl/fildat"); iskip(5); int c = iread();
C．Fi2eInputStream in = new FileInputStream("fildat"); int c = iread();
D．RandomAccessFile in = new RandomAccessFile ("chi/fil dat "); iskip (4); int c = ireadByte();

单项选择题

在下列程序的横线处填入正确的语句，实现RandomAccessFile类使用。 package ch1; import java. io. *; public class ex27 { public static void main(String args[] ) { try { RandomAccessFile in = new in.close ( ); } catch (Exception e) { e.printStackTrace (); } } }

A．RandomAccessFileC"ch1/fildat", "read")
B．RandomAccessFile("r", "ch1/fildat")
C．RandomAccessFile("ch1/fildat" , "r")
D．RandomAecessFile("read", "ch1/fildat")

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