1.&ensp;public&ensp;class&ensp;SwitchT...

单项选择题 1. public class SwitchTest {
2. public static void main （String []args） {
3. System.out.PrintIn（“value =” +switchIt（4））；
4. }
5. public static int switchIt（int x） {
6. int j = 1；
7. switch （x） {
8. case 1： j++；
9. case 2： j++；
10. case 3： j++；
11. case 4： j++；
12. case 5： j++；
13. default：j++；
14. }
15. return j + x；
16. }
17. }
What is the output from line 3？（）

A. Value = 3
B. Value = 4
C. Value = 5
D. Value = 6
E. Value = 7
F. Value = 8

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class TestException extends Exception {}
public void runTest （） throws TestException {}
public void test （） /* Point X*/ {
runTest （）；
}
}
At point X on line 4， which code can be added to make the code compile？（）

A. Throws Exception.
B. Catch （Exception e）.
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D. Catch （TestException e）.
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2.单项选择题 1.public class Test {
2.public static void main （String args[]） {
3.class Foo {
4.public int i = 3；
5.}
6.Object o = （Object） new Foo（）；
7.Foo foo = （Foo）o；
8.System.out.printIn（foo. i）；
9. }
10.}
What is the result？（）

A. Compilation will fail.
B. Compilation will succeed and the program will print “3”
C. Compilation will succeed but the program will throw a ClassCastException at line 6.
D. Compilation will succeed but the program will throw a ClassCastException at line 7.

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3.多项选择题Which two declarations prevent the overriding of a method？（）

A. Final void methoda（） {}
B. Void final methoda（） {}
C. Static void methoda（） {}
D. Static final void methoda（） {}
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4.多项选择题 public class OuterClass {
private double d1 1.0；
//insert code here
}
You need to insert an inner class declaration at line2. Which two inner class declarations are valid？（）

A. static class InnerOne { public double methoda（） {return d1；} }
B. static class InnerOne { static double methoda（） {return d1；} }
C. private class InnerOne { public double methoda（） {return d1；} }
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5.多项选择题Which two statements are true regarding the creation of a default constructor？（）

A. The default constructor initializes method variables.
B. The default constructor invokes the no-parameter constructor of the superclass.
C. The default constructor initializes the instance variables declared in the class.
D. If a class lacks a no-parameter constructor，， but has other constructors， the compiler creates a default constructor.
E. The compiler creates a default constructor only when there are no other constructors for the class.

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6.单项选择题You want a class to have access to members of another class in the same package. Which is the most restrictive access modifier that will accomplish that will accomplish this objective？（）

A. Public
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7.单项选择题Which will declare a method that is available to all members of the same package and can be referenced without an instance of the class？（）

A. Abstract public void methoda（）；
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8.单项选择题 //point X
public class foo {
public static void main （String[]args） throws Exception {
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}
}
Which statement at PointX on line 1 allows this code to compile and run？（）

A. Import java.io.*；
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9.单项选择题 public class Foo {
public void main （String [] args） {
system.out.printIn（“Hello World.”）；
}
}
What is the result？（）

A. An exception is thrown.
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D. The program exits without printing anything.

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10.单项选择题 1. public class Test {
2. public static void main （String []args） {
3. unsigned byte b = 0；
4. b--；
5.
6. }
7. }
What is the value of b at line 5？（）

A. -1
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C. 127
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