SCJP Mock Exam 1(2)
添加时间: 2007-9-23 2:34:30 作者: JAVA题库 阅读次数:79 来源: http://www.d9soft.com
Q11
What is wrong with the following code?
class MyException extends Exception {}
public class Qb4ab {
public void foo() {
try {
bar();
} finally {
baz();
} catch (MyException e) {}
}
public void bar() throws MyException {
throw new MyException();
}
public void baz() throws RuntimeException {
throw new RuntimeException();
}
}
1) Since the method foo() does not catch the exception generated by the method baz(), it must declare the RuntimeException in its throws clause.
2) A try block cannot be followed by both a catch and a finally block.
3) An empty catch block is not allowed.
4) A catch block cannot follow a finally block.
5) A finally block must always follow one or more catch blocks.
Q12
What will be written to the standard output when the following program is run?
public class Qd803 {
public static void main(String args[]) {
String word = "restructure";
System.out.println(word.substring(2, 3));
}
}
1) est
2) es
3) str
4) st
5) s
Q13
Given that a static method doIt() in a class Work represents work to be done, what block of code will succeed in starting a new thread that will do the work?
CODE BLOCK A:
Runnable r = new Runnable() {
public void run() {
Work.doIt();
}
};
Thread t = new Thread(r);
t.start();
CODE BLOCK B:
Thread t = new Thread() {
public void start() {
Work.doIt();
}
};
t.start();
CODE BLOCK C:
Runnable r = new Runnable() {
public void run() {
Work.doIt();
}
};
r.start();
CODE BLOCK D:
Thread t = new Thread(new Work());
t.start();
CODE BLOCK E:
Runnable t = new Runnable() {
public void run() {
Work.doIt();
}
};
t.run();
1) Code block A.
2) Code block B.
3) Code block C.
4) Code block D.
5) Code block E.
Q14
Write a line of code that declares a variable named layout of type LayoutManager and initializes it with a new object, which when used with a container can lay out components in a rectangular grid of equal-sized rectangles, 3 components wide and 2 components high.
Q15
public class Q275d {
static int a;
int b;
public Q275d() {
int c;
c = a;
a++;
b += c;
}
public static void main(String args[]) {
new Q275d();
}
}
1) The code will fail to compile, since the constructor is trying to access static members.
2) The code will fail to compile, since the constructor is trying to use static member variable a before it has been initialized.
3) The code will fail to compile, since the constructor is trying to use member variable b before it has been initialized.
4) The code will fail to compile, since the constructor is trying to use local variable c before it has been initialized.
5) The code will compile and run without any problems.
Q16
What will be written to the standard output when the following program is run?
public class Q63e3 {
public static void main(String args[]) {
System.out.println(9 ^ 2);
}
}
1) 81
2) 7
3) 11
4) 0
5) false
Q17
Which statements are true concerning the default layout manager for containers in the java.awt package?
1) Objects instantiated from Panel do not have a default layout manager.
2) Objects instantiated from Panel have FlowLayout as default layout manager.
3) Objects instantiated from Applet have BorderLayout as default layout manager.
4) Objects instantiated from Dialog have BorderLayout as default layout manager.
5) Objects instantiated from Window have the same default layout manager as instances of Applet.
Q18
Which declarations will allow a class to be started as a standalone program?
1) public void main(String args[])
2) public void static main(String args[])
3) public static main(String[] argv)
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