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单选题
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?()
A
TestA
B
TestB
C
Compilation fails.
D
An exception is thrown at runtime.
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AAAB
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8D
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An exception is thrown at runtime.G
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运行错误D
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单选题现有: 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(); ) } 运行结果是哪项?()A
TeStAB
TeStBC
编译失败D
运行时抛出异常
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多选题1. class TestA { 2. TestB b; 3. TestA() { 4. b = new TestB(this); 5. } 6. } 7. class TestB { 8. TestA a; 9. TestB(TestA a) { 10. this.a = a; 11. } 12. } 13. class TestAll { 14. public static void main (String args[]) { 15. new TestAll().makeThings(); 16. // ...code continues on 17. } 18. void makeThings() { 19. TestA test = new TestA(); 20. } 21. } Which two statements are true after line 15, before main completes?()ALine 15 causes a stack overflow.BAn exception is thrown at runtime.CThe object referenced by a is eligible for garbage collection.DThe object referenced by b is eligible for garbage collection.EThe object referenced by a is not eligible for garbage collection.FThe object referenced by b is not eligible for garbage collection.
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A doneB
B doneC
A done B doneD
B done A doneE
There is no exception that the application will print anything.F
The application outputs “A done” and “B done”, in no guaranteed order.
考题
单选题1. interface TestA { String toString(); } 2. public class Test { 3. public static void main(String[] args) { 4. System.out.println(new TestA() { 5. public String toString() { return “test”; } 6. } 7. } 8. } What is the result?()A
testB
nullC
An exception is thrown at runtime.D
Compilation fails because of an error in line 1.E
Compilation fails because of an error in line 4.F
Compilation fails because of an error in line 5.
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