Which three will compile and rim without exception?()
第1题:
A.move the line 12 print statement into the foo() method
B.change line 7 to public synchronized void go() {
C.change the variable declaration on line 2 to private volatile int x;
D.wrap the code inside the foo() method with a synchronized( this ) block
E.wrap the for loop code inside the go() method with a synchronized block synchronized(this){ //for loop code here }
第2题:
下列程序的输出结果为( )。 public class Reentrant { public synchronized void a() { b(); System.out.println("here I am, in a()"); } public synchronized void b() { System.out.println("here I am, in b()"); } public static void main(String args[ ]) { Reentrant r=new Reentrant(); r.a(); } }
A.here I am, in a()/here I am, in b()
B.hereI am, in b()/here I am, in a()
C.here I am, in a()
D.here I am, in b()
第3题:
What happens when you try to compile and run the following program?
class Mystery{String s;public static void main(String[] args){
Mystery m=new Mystery();m.go();}void Mystery(){s=”constructor”;}void go(){System.out.println(s);}
}()
A.this code will not compile
B.this code compliles but throws an exception at runtime
C.this code runs and “constructor” in the standard output
D.this code runs and writes “null” in the standard output
第4题:
public class Team extends java.util.LinkedList { public void addPlayer(Player p) { add(p); } public void compete(Team opponent) { /* more code here */ } } class Player { /* more code here */ } Which two are true?()
第5题:
class One { void foo() {} } class Two extends One { //insert method here } Which three methods, inserted individually at line 14, will correctly complete class Two?()
第6题:
下列程序的输出结果为( )。 public class Reentrant { public synchronized void a() { b(); System.out.println("here I am,in a()"); } public synchronized void b() { System.out.println("here I am,in b()"); } public static void main(String args[]) { Reentrant r=new Reentrant(); r.a(); } }
A.here I am,in a()/here I am,in b()
B.here I am,in b()/here I am,in a()
C.here I am,in a()
D.here I am,in b()
第7题:
以下哪个方法可以用来获得进度条的当前进度值?()
第8题:
A.int foo() { /* more code here */ }
B.void foo() { /* more code here */ }
C.public void foo() { /* more code here */ }
D.private void foo() { /* more code here */ }
E.protected void foo() { /* more code here */ }
第9题:
现有: 1. class Propeller2 { 2. pulolic static void main (String[]args)//add code here? 3. { new Propeller2().topGo(); } 4. 5.void topGo() //add code here? 6. { middleGo(); } 7. 8.void middleGo() //add code here? 9. { go(); System.out.println ("late middle"); } void go() //add code here? 12. {throw new Exception(); } 13. } 为使代码通过编译,需要在哪一行加入声明throws Exception?()
第10题:
import java.util.*; public class NameList { private List names = new ArrayList(); public synchronized void add(String name) { names.add(name); } public synchronized void printAll() { for (int i = 0; i