單項(xiàng)選擇題

1.class TestSuper { 22.TestSuper（int i） { } 3. } 4.class TestSub extends TestSuper{ } 5.class TestAll { 6.public static void main （String [] args） { 7.new TestSub（）； 8.} 9.} Which is true？（）

A. Compilation fails.
B. The code runs without exception.
C. An exception is thrown at line 7.
D. An exception is thrown at line 2.

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單項(xiàng)選擇題

package foo；
import java.util.Vector；
private class MyVector extends Vector {
int i = 1；
public MyVector（） {
i = 2；
}
}
public class MyNewVector extends MyVector {
public MyNewVector（） {
i = 4；
}
public static void main（String args[]） {
MyVector v = new MyNewVector（）；
}
}
What is the result？（）

A. Compilation succeeds.
B. Compilation fails because of an error at line 5.
C. Compilation fails because of an error at line 6.
D. Compilation fails because of an error at line 14.
E. Compilation fails because of an error at line 17.

單項(xiàng)選擇題

Which statement is true about assertion in the Java programming language？（）

A. Assertion expressions should not contain side effects.
B. Assertion expression values can be any primitive type.
C. Assertion should be used for enforcing preconditions on public methods.
D. An AssertionError thrown as a result of a failed assertion should always be handled by the enclosing method.

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1.class TestSuper { 22.TestSuper（int i） { } 3. } 4.class TestSub extends TestSuper{ } 5.class TestAll { 6.public static void main （String [] args） { 7.new TestSub（）； 8.} 9.} Which is true？（）

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Which statement is true about assertion in the Java programming language？（）

1.class TestSuper { 22.TestSuper（int i） { } 3. } 4.class TestSub extends TestSuper{ } 5.class TestAll { 6.public static void main （String [] args） { 7.new TestSub（）； 8.} 9.} Which is true？（）