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SCJP试题

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A method is ...

1) an implementation of an abstraction.

2) an attribute defining the property of a particular abstraction.

3) a category of objects.

4) an operation defining the behavior for a particular abstraction.

5) a blueprint for making operations.

An object is ...

1) what classes are instantiated from.

2) an instance of a class.

3) a blueprint for creating concrete realization of abstractions.

4) a reference to an attribute.

5) a variable.

Which line contains a constructor in this class definition?

public class Counter { // (1)

int current, step;

public Counter(int startValue, int stepValue) { // (2)

set(startValue);

setStepValue(stepValue);

}

public int get() { return current; } // (3)

public void set(int value) { current = value; } // (4)

public void setStepValue(int stepValue) { step = stepValue; } // (5)

}

1) Code marked with (1) is a constructor

2) Code marked with (2) is a constructor

3) Code marked with (3) is a constructor

4) Code marked with (4) is a constructor

5) Code marked with (5) is a Constructor

Given that Thing is a class, how many objects and reference variables are created by the following

code?

Thing item, stuff;

item = new Thing();

Thing entity = new Thing();

1) One object is created

2) Two objects are created

3) Three objects are created

4) One reference variable is created

5) Two reference variables are created

6) Three reference variables are created.

An instance member…

1) is also called a static member

2) is always a variable

3) is never a method

4) belongs to a single instance, not to the class as a whole

5) always represents an operation

How do objects pass messages in Java?

1) They pass messages by modifying each other's member variables

2) They pass messages by modifying the static member variables of each other's classes

3) They pass messages by calling each other's instance member methods

4) They pass messages by calling static member methods of each other's classes.

Given the following code, which statements are true?

class A {

int value1;

}

class B extends A {

int value2;

}

1) Class A extends class B.

2) Class B is the superclass of class A.

3) Class A inherits from class B.

4) Class B is a subclass of class A.

5) Objects of class A have a member variable named value2.

If this source code is contained in a file called SmallProg.java, what command should be used to

compile it using the JDK?

public class SmallProg {

public static void main(String args[]) { System.out.println("Good luck!"); }

}

1) java SmallProg

2) avac SmallProg

3) java SmallProg.java

4) javac SmallProg.java

5) java SmallProg main

Given the following class, which statements can be inserted at position 1 without causing the code

to fail compilation?

public class Q6db8 {

int a;

int b = 0;

static int c;

public void m() {

int d;

int e = 0;

// Position 1

}

1) a++;

2) b++;

3) c++;

4) d++;

5) e++;

Q10

Which statements are true concerning the effect of the >> and >>> operators?

1) For non-negative values of the left operand, the >> and >>> operators will have the same effect.

2) The result of (-1 >> 1) is 0.

3) The result of (-1 >>> 1) is -1.

4) The value returned by >>> will never be negative as long as the value of the right operand is

equal to or greater than 1.

5) When using the >> operator, the leftmost bit of the bit representation of the resulting value will

always be the same bit value as the leftmost bit of the bit representation of the left operand.

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.

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评论星级较低，若资源使用遇到问题可联系上传者，3个工作日内问题未解决可申请退款~

tallcat081

2013-08-24

真好的，只是老了。
sh_wenwei

2012-07-04

试题比较简单，基础，适合初学者。

shuminggege

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