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2. 1) class Super{ 2) public float getNum(){return 3.0f;} 3) } 4) 5) public class Sub extends Super{ 6) 7) } which method, placed at line 6, will cause a compiler error? A. public float getNum(){return 4.0f;} B. public void getNum(){} C. public void getNum(double d){} D. public double getNum(float d){return 4.0d;} /b
4. public class Foo{ public static void main(String args[]){ try{return;} finally{ System.out.println("Finally");} } } what is the result? A. print out nothing B. print out "Finally" C. compile error /b
12. public class Test{ public static void main(String[] args){ String foo=args[1]; Sring bar=args[2]; String baz=args[3]; } } java Test Red Green Blue what is the value of baz? A. baz has value of "" B. baz has value of null C. baz has value of "Red" D. baz has value of "Blue" E. baz has value of "Green" F. the code does not compile G. the program throw an exception /g /ArrayIndexOutOfBoundsException
27. public class SychTest{ private int x; private int y; public void setX(int i){ x=i;} public void setY(int i){y=i;} public Synchronized void setXY(int i){ setX(i); setY(i); } public Synchronized boolean check(){ return x!=y; } } Under which conditions will check() return true when called from a different class? A.check() can never return true. B.check() can return true when setXY is callled by multiple threads. C.check() can return true when multiple threads call setX and setY separately. D.check() can only return true if SychTest is changed allow x and y to be set separately. /c
public class Foo{ public static void main(String[] args){ StringBuffer a = new StringBuffer("A"); StringBuffer b = new StringBuffer("B"); Operate(a,b); System.out.println(a + "," + b); } static void operate(StringBuffer x,StringBuffer y){ y.append(x); y = x; } // end operate }
What print?
a. "A,B" b. "A,A" c. "B,B" d. "AB,B" e. "AB,AB" f, "A,AB"
Answer: F
public class x implements Runnable{ private int x; private int y;
public static void main(String args[] ){ x that = new x(); (new Thread(that)).start(); (new Thread(that)).start(); } public synchronized void run(){ for( ; ; ){ x++; y++; System.out.Println("x=" + x + ", y=" +y); } }
a. An error at line 11 b. An error at line 7, 8 c. The program prints pairs of values for x and y that might not always be the same on the same line (for example "x=2, y=1") d. The program prints pairs of values for x and y that are always the same on the same line (for example "x=1, y=1") in addition, each value appears twice (for example "x=1, y=1" followed by "x=1, y=1") e. The program prints pairs of values for x and y that are always the same on the same line (for example "x=1, y=1") in addition, each value appears only once (for example "x=1, y=1", followed by "x=2, y=2)
1. public class x{ 2. public object m(){ 3. Object o=new Float(2.14F); 4. Object [] oa=new Object[1]; 5. oa[0]=o; 6. o=null; 7. return o; 8. } // end m() method. 9. }
When is the Float object creation in line 3 eligible for garbage collection ?
a. just after line 5 b. just after line 6 c. just after line 7 (that is , as the method returns) d. just after line 8 (that is, as the method ends)
1. abstract class AbstractIt{ 2. abstract float getFloat(); 3. } 4. public class AbstractTest extends AbstractIt{ 5. private float f1 = 1.0f; 6. private float getFloat(){return f1} 7. }
what result?
a. compile success b. An error at line 6 c. An error at line 4 d. An error at line 2
Answer: b
2. import java.io.IOException;
public class ExceptionTest{ public static void main(String[] args){ try{ methodA(); }catch(IOException io){ System.out.println("caught IOException"); }catch(Exception e){ System.out.println("caught Exception"); } } public void methodA(){ throw new IOException(); } }
what result?
a. The code will not compile b. Output is "caught Exception" c. Output is "caught IOException" d. The program execute nomally whihout print a message
Answer: a non-static method methodA() cannot be refereced from a static context.
3. public class Foo{ public static void main(String[] args)[ try{ return;} finally{ System.out.println("Finally");} } }
what result?
a. Print nothing b. Print "Finally" c. Not compiled and will Exception thrown d. Not compile because catch block missing
Answer: b
4. 1. class A implements Runnable { 2. int I; 3. public void run () { 4. try { 5. Thread.sleep(5000); 6. i=10; 7. }catch(InterruptedException e) {} 8. } 9. } 10. 11. public class Test { 12. public static void main (String args[]) { 13. try { 14. A a = new A(); 15. Thread t = new Thread(a); 16. t.start(); 17. 18. int j= a.i; 19. 20. }catch (Exception e) {} 21. } 22. }
Which statement at line 17 will ensure that j=10 at line 19
A. a.wait(); B. t.wait(); C. t.join(); D. t.yield(); E. t.notify(); F. a.notify(); G. t.interrupt();
Answer: C
5. 1. public class SyncTest { 2. private int x; 3. private int y; 4. private synchronized void set X (int i){ x=i; } 5. private synchronized void set Y (int i){ y=i; } 6. public void setXY (int i) {set X(i); set Y(i); } 7. public synchronized boolean check() {return X != Y; } 8. }
Under which conditions will check() return when called from a different class. Choose one
A. check() can never return true B. check() can return true when set XY is called by multiple threads C. check() can true when multiple threads call set X and set Y separately D. check() can only return true if synchTest is changed to allow x and y to be set separately
Answer: C
6. Which is a method of the MouseMotionListener interface
