Compilation of class A fails.
Line 28 prints the value 3 to System.out.
Line 28 prints the value 1 to System.out.
A runtime error occurs when line 25 executes.
Compilation fails because of an error on line 28.
第1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2题:
public class TestOne implements Runnable { public static void main (String[] args) throws Exception { Thread t = new Thread(new TestOne()); t.start(); System.out.print(”Started”); t.join(); System.out.print(”Complete”); } public void run() { for (int i= 0; i< 4; i++) { System.out.print(i); } } } What can be a result?()
第3题:
1. public class A { 2. 3. private int counter = 0; 4. 5. public static int getInstanceCount() { 6. return counter; 7. } 8. 9. public A() { 10. counter++; 11. } 12. 13. } Given this code from Class B: 25.A a1 =new A(); 26. A a2 =new A(); 27. A a3 =new A(); 28. System.out.printIn(A.getInstanceCount() ); What is the result?()
第4题:
Given: 11. static class A { 12. void process() throws Exception { throw new Exception(); } 13. } 14. static class B extends A { 15. void process() { System.out.println("B "); } 16. } 17. public static void main(String[] args) { 18. A a = new B(); 19. a.process(); 20. } What is the result? ()
第5题:
Compilation fails.
ClassC is displayed.
The code runs with no output.
An exception is thrown at runtime.
第6题:
Compilation fails.
An exception is thrown at runtime.
The code executes and prints “StartedComplete”.
The code executes and prints “StartedComplete0123”.
The code executes and prints “Started0l23Complete”.
第7题:
Line l = new Line() ; l.Point p = new l.Point();
Line.Point p = new Line.Point();
The Point class cannot be instatiated at line 15.
Point p = new Point();
第8题:
Compilation of class A fails.
Line 28 prints the value 3 to System.out.
Line 28 prints the value 1 to System.out.
Compilation fails because of an error on line 28.
A runtime error occurs when line 25 executes.
第9题:
Compilation fails.
An exception is thrown at runtime.
The code executes normally and prints “bar”.
The code executes normally, but nothing prints.
第10题:
Compilation of class A fails.
Line 28 prints the value 3 to System.out.
Line 28 prints the value 1 to System.out.
A runtime error occurs when line 25 executes.
Compilation fails because of an error on line 28.
第11题:
The application will crash.
The code on line 29 will be executed.
The code on line 5 of class A will execute.
The code on line 5 of class B will execute.
The exception will be propagated back to line 27.
第12题:
Compilation will fail.
The program prints “0”.
The program prints “3”.
Compilation will succeed but an exception will be thrown at line 3.
第13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14题:
public class test { public static void add3 (Integer i){ int val = i.intValue ( ); val += 3; i = new Integer (val); } public static void main (String args [ ] ) { Integer i = new Integer (0); add3 (i); system.out.printIn (i.intValue ( ) ); } } What is the result?()
第15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16题:
Compilation fails.
An exception is thrown at runtime.
The code executes and prints “running”.
The code executes and prints “runningrunning”.
The code executes and prints “runningrunningrunning”.
第17题:
Compilation fails.
An exception is thrown at runtime.
The code executes and prints "running".
The code executes and prints "runningrunning".
The code executes and prints "runningrunningrunning".
第18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19题:
The code runs with no output.
Compilation fails.
An exception is thrown at runtime.
ClassC is displayed.
第20题:
Line 26 prints "a" to System.out.
Line 26 prints "b" to System.out.
An exception is thrown at line 26 at runtime.
Compilation of class A will fail due to an error in line 6.
第21题:
Compilation of class A fails.
Line 28 prints the value 3 to System.out.
Line 28 prints the value 1 to System.out.
A runtime error occurs when line 25 executes.
Compilation fails because of an error on line 28.
第22题:
Compilation fails.
exception is thrown at runtime.
The attribute id in the ItemTest object remains unchanged.
The attribute id in the ItemTest object is modified to the new value.
A new ItemTest object is created with the preferred value in the id attribute.
第23题:
Compilation of class A fails.
Line 28 prints the value 3 to System.out.
Line 28 prints the value 1 to System.out.
A runtime error occurs when line 25 executes.
Compilation fails because of an error on line 28.