2011年JAVA认证模拟题第二阶段（28）

会计考友 · 发表于 2012-8-4 12:33:16

　　Q82.What is the result of attempting to compile and run the following program?
　　1. import java.io.*;
　　2. public class OutOut {
　　3. public static void main(String args[]) throws IOException {
　　4. PrintStream pr = new PrintStream(new FileOutputStream(“outfile”));
　　5. System.out = pr;
　　6. System.out.println(“Lets see what I see now??”);
　　7. ｝
　　8. ｝
　　[Select one correct answer]
　　a. The code causes a compiler e rror. out is a declared final in System and cannot be assigned to pr.
　　b. The code causes a runtime Exception due the assignment to a final variable.
　　c. The code compiles and runs success fully. A file called “outfile” is created and “Lets see what I see now??” is printed in the same.
　　d. The code cause a compiler error. PrintStream is an abstract class
　　Q83.What is the result of attempting to compiler and run the following pieceof code.

　　1. import java.awt.*;
　　2. public class TestFrame extends Frame {
　　3. public TestFrame() {
　　4. Button one = new Button(“One”);
　　5. Button two = new Button(“Two”);

会计考友 · 发表于 2012-8-4 12:33:17

</p>　　6. Button three = new Button(“Three”);
　　7. setLayout(new FlowLayout());
　　8. add(one);
　　9. add(two);
　　10. add(three);
　　11. setSize(1000,1000);
　　12. setVisible(true);
　　13. two.setVisible(false);
　　14. ｝
　　15. public static void main(String args[]) {
　　16. TestFrame tf = new TestFrame();
　　17. ｝
　　18. ｝
　　Select one correct answer
　　a. If the above code runs, the buttons - one and three are laid out in a single row from left to right with a gap in between.
　　b. If the above code runs, the buttons - one and three are laid out in a single row from left to right with no gap in between.
　　c. Code does not compile - a component can not be hidden after being added to a container.
　　d. Code gets compiled successfully but throws runtime Exception - a component can not be hidden after being added to a container.

　　Q84.What is the result of attempting to compile and run the following piece of code?
　　1. import java.awt.*;
　　2. public class TestFrame extends Frame {
　　3. public TestFrame() {
　　4. CheckboxGroup chg = null;
　　5. Checkbox ch = new Checkbox(“Test”,true,chg);
　　6. setLayout(new FlowLayout());
　　7. add(ch);
　　8. pack();
　　9. setVisible(true);
　　10. ｝
　　11.
　　12. public static void main(String args[]) {
　　13. TestFrame tf = new TestFrame();
　　14. ｝
　　15. ｝
　　[Select one correct answer]
　　a. It will cause a compilation error as the checkbox group is null in the constructor.
　　b. It will compile successfully but throws a runtime exception because the checkbox group is null in the constructor of the check box.
　　c. It will compile and run successfully. The checkbox appears as a single radio button which is always true
　　d. It will compile and run successfully. The checkbox bears its original appeareonent can not be hidden after being added to a container.

　　Q84.What is the result of attempting to compile and run the following piece of code?

　　1. import java.awt.*;

会计考友 · 发表于 2012-8-4 12:33:18

</p>　　2. public class TestFrame extends Frame {
　　3. public TestFrame() {
　　4. CheckboxGroup chg = null;
　　5. Checkbox ch = new Checkbox(“Test”,true,chg);
　　6. setLayout(new FlowLayout());
　　7. add(ch);
　　8. pack();
　　9. setVisible(true);
　　10. ｝
　　11.
　　12. public static void main(String args[]) {
　　13. TestFrame tf = new TestFrame();
　　14. ｝
　　15. ｝
　　[Select one correct answer]
　　a. It will cause a compilation error as the checkbox group is null in the constructor.
　　b. It will compile successfully but throws a runtime exception because the checkbox group is null in the constructor of the check box.
　　c. It will compile and run successfully. The checkbox appears as a single radio button which is always true
　　d. It will compile and run successfully. The checkbox bears its original appeareonent can not be hidden after being added to a container.

　　Q84.What is the result of attempting to compile and run the following piece of code?
　　1. import java.awt.*;
　　2. public class TestFrame extends Frame {
　　3. public TestFrame() {
　　4. CheckboxGroup chg = null;
　　5. Checkbox ch = new Checkbox(“Test”,true,chg);
　　6. setLayout(new FlowLayout());
　　7. add(ch);
　　8. pack();
　　9. setVisible(true);
　　10. ｝
　　11.
　　12. public static void main(String args[]) {
　　13. TestFrame tf = new TestFrame();
　　14. ｝
　　15. ｝
　　[Select one correct answer]
　　a. It will cause a compilation error as the checkbox group is null in the constructor.
　　b. It will compile successfully but throws a runtime exception because the checkbox group is null in the constructor of the check box.

　　c. It will compile and run successfully. The checkbox appears as a single radio button which is always true

会计考友 · 发表于 2012-8-4 12:33:19

</p>　　d. It will compile and run successfully. The checkbox bears its original appeareonent can not be hidden after being added to a container.

　　Q84.What is the result of attempting to compile and run the following piece of code?
　　1. import java.awt.*;
　　2. public class TestFrame extends Frame {
　　3. public TestFrame() {
　　4. CheckboxGroup chg = null;
　　5. Checkbox ch = new Checkbox(“Test”,true,chg);
　　6. setLayout(new FlowLayout());
　　7. add(ch);
　　8. pack();
　　9. setVisible(true);
　　10. ｝
　　11.
　　12. public static void main(String args[]) {
　　13. TestFrame tf = new TestFrame();
　　14. ｝
　　15. ｝
　　[Select one correct answer]
　　a. It will cause a compilation error as the checkbox group is null in the constructor.
　　b. It will compile successfully but throws a runtime exception because the checkbox group is null in the constructor of the check box.
　　c. It will compile and run successfully. The checkbox appears as a single radio button which is always true
　　d. It will compile and run successfully. The checkbox bears its original appearence and does not appear as a radio button.

　　82. a
　　83. a
　　84. d

		自动登录	找回密码
密码			立即注册

[考试试题] 2011年JAVA认证模拟题第二阶段（28）