class MyThread extends Thread { public void run() { System.out.println(“AAA”); } public void run(Runnable r) { System.out.println(“BBB”); } public static void main(String[] args) { new Thread(new MyThread()).start(); } } What is the result?()
第1题:
通过实现Runnable接口创建线程,请在下面横线处填入代码完成此程序。
注意:不改动程序结构,不得增行或删行。
class ThreadTest implements Runnable
{
Thread thrObj;
public static void main(String args[])
{
System.out.println("这是一个通过实现接口创建线程的例子");
ThreadTest testObj=new ThreadTest();
testObj.create();
}
public void create()
{
if(thrObj= =null)
{
thrObj=new Thread(this,"myThread");
______
}
}
public void run()
{
System.out.println("Thread"+throbj.getName()+":"+"在运行!");
}
}
第2题:
在下面程序的下画线处应填入的选项是 public class Test______{ public static void main(String args[]) { Test t=new Test(); Thread tt=new Thread(t); tt.start(); } public void run() { for(int i=0;i<5;i++) System.out.println("i="+i); } }
A.implements Runnable
B.extends Thread
C.implements Thread
D.extends Runnable
第3题:
3下碳程序段的输出结果是( )。 class Test{ public static void main(Srting args[]){ MyThread t=new MyThread(); t.displayOutput("t has been created"); t.start(); } } class MyThread extends Thread{ public void displayOutput(String s){ SYStem.out.println(s); } public void run() { displayOutput("t is running."); } }
A.t has been created.
B.t has been created. t is running.
C.t is running.
D.编译出错
第4题:
阅读下面程序 public class Test2 ______ { public static void main(String[] args) { Thread t=new Test2(); t.start(); } public void run() { System.out.println("How are you."); } } 程序中下画线处应填入的正确选项是
A.implements Thread
B.extends Runnable
C.implements Runnable
D.extends Thread
第5题:
请阅读下面程序,说明该程序创建线程使用的方法是( )。 public class ThreadTest { public static void main(String args[]) { Thread tl=new Thread(new HolloWorld); Thread t2=new Thread(new HolloWorld); tl.start; t2.Start; } } class HolloWorld implements Runnable { int i; public void run { while(true) { System.out.println("HolloWorld"+i++); if(i= =5)break; } } }
A.继承Thread类
B.实现Runnable接口
C.tl.start
D.t2.start
第6题:
( 30 )在程序的下划线处应填入的选项是
public class Test _________{
public static void main(String args[]){
Test t = new Test();
Thread tt = new Thread(t);
tt.start();
}
public void run(){
for(int i=0;i<5;i++){
system.out.println( " i= " +i);
}
}
}
A ) implements Runnable
B ) extends Thread
C ) implements Thread
D ) extends Runnable
第7题:
public class Threads5 { public static void main (String[] args) { new Thread(new Runnable() { public void run() { System.out.print(”bar”); } }).start(); } } What is the result?()
第8题:
public class A extends Thread { A() { setDaemon(true); } public void run() { (new B()).start(); try { Thread.sleep(60000); } catch (InterruptedException x) {} System.out.println(“A done”); } class B extends Thread { public void run() { try { Thread.sleep(60000); } catch (InterruptedException x) {} System.out.println(“B done”); } } public static void main(String[] args) { (new A()).start(); } } What is the result?()
第9题:
1. class MyThread implements Runnable { 2. public void run() { 3. System.out.print("go "); 4. } 5. 6. public static void main(String [] args) { 7. // insert code here 8. t.start(); 9. } 10. } 和如下四句: Thread t = new MyThread(); MyThread t = new MyThread(); Thread t = new Thread(new Thread()); Thread t = new Thread(new MyThread()); 分别插入到第5行,有几个可以通过编译?()
第10题:
Which two code fragments will execute the method doStuff() in a separate thread?()
第11题:
Compilation fails.
An exception is thrown at runtime.
The code executes normally and prints „foo”.
The code executes normally, but nothing is printed.
第12题:
A done
B done
A done B done
B done A done
There is no exception that the application will print anything.
The application outputs “A done” and “B done”, in no guaranteed order.
第13题:
下面程序段的输出结果是 class Test{ public static void main(String args[]){ MyThread t=new MyThread(); t.displayOutput("t has been created)); t.start(); } } class MyThread extends Thread{ public void displayOutput(String s){ System.out.println(s); } public void run(){ displayOutput(t is running."); } }
A.t has been created.
B.t has been created. t is running.
C.t is running.
D.编译出错
第14题:
下面程序段的输出结果是 classTest{ public static void main(Stringargs[]){ MyThread t=new MyThread(); t.displayOutput(”t has been createD) ”); t.start(); } } Class MyThread extends Thread{ public void displayOutput(Strings){ System.out.println(S); } public void run(){ displayOutput(”t is running.”); } }
A.thas been created. t is running.
B.thas been created
C.t is running.
D.编译出错
第15题:
下面程序段的输出结果是 class Test{ public static void main(String args[]){ MyThread t=new MyThread(); t.displayOutput("t has been createD) "; t.start(); } } class MyThread extends Thread{ public void displayOutput(String s){ System.out.println(s); } public void nm(){ displayOutput("t is running."); }
A.t has been created. t is running.
B.t has been created.
C.t is running.
D.编译出错
第16题:
阅读下面程序 public class Test implements Runnable { public static void main(String[] args) { ______ t.start(); } public void run() { System.out.println("Hello!"); } } 程序中下画线处应填入的正确选项是
A.Test t=new Test();
B.Thread t=new Thread();
C.Thread t=new Thread(new Test());
D.Test t=new Thread();
第17题:
下列程序创建了一个线程并运行,请在下划线处填入正确代码。
public class Try extends Thread{
public static void main(String args[]){
Threadt=new Try();
【 】;
}
public void run(){
System.out.println(“Try!”);
}
}
第18题:
public class Threads3 implements Runnable { public void run() { System.out.print(”running”); } public static void main(String[] args) { Thread t = new Thread(new Threads3()); t.run(); t.run(); t.start(); } } What is the result?()
第19题:
class TestA { public void start() { System.out.println(”TestA”); } } public class TestB extends TestA { public void start() { System.out.println(”TestB”); } public static void main(String[] args) { ((TestA)new TestB()).start(); } } What is the result?()
第20题:
Which two code fragments will execute the method doStuff() in a separate thread?()
第21题:
public class Threads4 { public static void main (String[] args) { new Threads4().go(); } public void go() { Runnable r = new Runnable() { public void run() { System.out.print(”foo”); } }; Thread t = new Thread(r); t.start(); t.start(); } } What is the result?()
第22题:
AAA
BBB
Compilation fails.
The code runs with no output.
第23题:
TestA
TestB
Compilation fails.
An exception is thrown at runtime.