11. static class A {
12. void process() throws Exception { throw new Exception(); }
13. }
14. static class B extends A {
15. void process() { System.out.println(”B”); }
16. }
17. public static void main(String[] args) {
18. new B().process();
19. }
What is the result?()
Class TestException
1. public class TestException extends Exception {
2. } Class a:
1. public class a {
2.
3. public String sayHello(String name) throws TestException {
4.
5. if(name == null) {
6. throw new TestException();
7. }
8.
9. return “Hello “+ name;
10. }
11.
12. }
A programmer wants to use this code in an application:
45. A a=new A();
46. System.out.println(a.sayHello(”John”));
Which two are true?()
Which statements concerning the relationships between the following classes are true?()
class Foo { int num;
Baz comp = new Baz();
}
class Bar { boolean flag;
}
class Baz extends Foo {
Bar thing = new Bar();
double limit;
}
现有:
interface Data {public void load();}
abstract class Info {public abstract void load();}
下列类定义中正确使用Data和Info的是哪项?()
在Java语言中,如果你有下面的类定义:
Abstract class Shape{ Abstract void draw(); }
class Square extendeds Shape{}
如果你试图编译上面的代码会发生()。
在Java语言中,如果你有下面的类定义:
abstract class Shape {
abstract void draw(); }
Class Square extends Shape {}
如果你试图编译上面的代码会发生()。
class java {
public static void main(String [] java) {
for (int Java = 1; Java 〈 java.length; Java++)
System.out.print("java ");
}
}
和命令行:
java java java java java
结果为:()
class Wrench {
public static void main(String [] args) {
Wrench w = new Wrench(); Wrench w2 = new Wrench();
w2 = go(w,w2);
System.out.print(w2 == w);
}
static Wrench go(Wrench wr1, Wrench wr2) {
Wrench wr3 = wr1; wr1 = wr2; wr2 = wr3;
return wr3;
}
}
结果是什么?()
现有:
class Tree {
private static String tree = "tree ";
String getTree () { return tree; }
}
class Elm extends Tree {
private static String tree = "elm ";
public static void main (String [] args) {
new Elm() .go (new Tree()) ;
}
}
void go (Tree t) {
String s = t.getTree () +Elm.tree + tree + (new Elm() .getTree ()) ;
System.out.println (s) ;}
结果为:()
import java.io.*;
public class Forest implements Serializable {
private Tree tree = new Tree();
public static void main(String [] args) {
Forest f= new Forest();
try {
FileOutputStream fs = new FileOutputStream(”Forest.ser”);
ObjectOutputStream os = new ObjectOutputStream(fs);
os.writeObject(f); os.close();
} catch (Exception ex) { ex.printStackTrace(); }
}
}
class Tree { }
What is the result?()
public class TestOne {
public static void main (String[] args) throws Exception {
Thread.sleep(3000);
System.out.println(”sleep”);
}
}
What is the result?()
public class A extends Thread {
A() {
setDaemon(true);
}
public void run() {
(new B()).start();
try {
Thread.sleep(60000);
} catch (InterruptedException x) {}
System.out.println(“A done”);
}
class B extends Thread {
public void run() {
try {
Thread.sleep(60000);
} catch (InterruptedException x) {}
System.out.println(“B done”);
}
}
public static void main(String[] args) {
(new A()).start();
}
}
What is the result?()
public class TwoThreads {
private static Object resource = new Object();
private static void delay(long n) {
try { Thread.sleep(n); }
catch (Exception e) { System.out.print(”Error “); }
}
public static void main(String[] args) {
System.out.print(”StartMain “);
new Thread1().start();
delay(1000);
Thread t2 = new Thread2();
t2.start();
delay(1000);
t2.interrupt
delay(1000);
System.out.print(”EndMain “);
}
static class Thread 1 extends Thread {
public void run() {
synchronized (resource) {
System.out.print(”Startl “);
delay(6000);
System.out.print(”End1 “);
}
}
}
static class Thread2 extends Thread {
public void run() {
synchronized (resource) {
System.out.print(”Start2 “);
delay(2000);
System.out.print(”End2 “);
}
}
}
}
Assume that sleep(n) executes in exactly m milliseconds, and all other code executes in an insignificant amount of time. What is the output if the main() method is run?()
阅读以下代码:
public class Test{
public static void main(){
System.out.println(“x=”+x); } }
请问,代码运行的结果是?()
1. class Pizza {
2. java.util.ArrayList toppings;
3. public final void addTopping(String topping) {
4. toppings.add(topping);
5. }
6. }
7. public class PepperoniPizza extends Pizza {
8. public void addTopping(String topping) {
9. System.out.println(”Cannot add Toppings”);
10. }
11. public static void main(String[] args) {
12. Pizza pizza = new PepperoniPizza();
13. pizza.addTopping(”Mushrooms”);
14. }
15. }
What is the result?()
public class X {
public static void main (String[]args) {
string s = new string (“Hello”);
modify(s);
System.out.printIn(s);
}
public static void modify (String s) {
s += “world!”;
}
}
What is the result?()
分析下列Java代码:
class A {
public static void main(String[] args) {
method(); }
static void method() { try {
System.out.println("Hello"); System.exit(0); }
finally {
System.out.println("good-bye"); } } }
编译运行后,输出结果是()。
Assuming that the serializeBanana2() and the deserializeBanana2() methods will correctly use Java serialization and given:
import java.io.*;
class Food {Food() { System.out.print(”1”); } }
class Fruit extends Food implements Serializable {
Fruit() { System.out.print(”2”); } }
public class Banana2 extends Fruit { int size = 42;
public static void main(String [] args) {
Banana2 b = new Banana2();
b.serializeBanana2(b); // assume correct serialization
b = b.deserializeBanana2(b); // assume correct
System.out.println(” restored “+ b.size + “ “); }
// more Banana2 methods
}
What is the result?()
1. public class SimpleCalc {
2. public int value;
3. public void calculate() { value += 7; }
4. }
And:
1. public class MultiCalc extends SimpleCalc {
2. public void calculate() { value -= 3; }
3. public void calculate(int multiplier) {
4. calculate();
5. super.calculate();
6. value *=multiplier;
7. }
8. public static void main(String[] args) {
9. MultiCalc calculator = new MultiCalc();
10. calculator.calculate(2);
11. System.out.println(”Value is: “+ calculator.value);
12. }
13. }
What is the result?()
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();
}
}
class Birds {
public static void main(String [] args) {
try {
throw new Exception();
} catch (Exception e) {
try {
throw new Exception();
} catch (Exception e2) { System.out.print("inner "); }
System.out.print("middle ");
}
System.out.print("outer ");
}
}
结果为:()
现有:
class Birds {
public static void main (String [] args) {
try {
throw new Exception () ;
} catch (Exception e) {
try {
throw new Exception () ;
} catch (Exception e2) { System.out.print ("inner "); }
System. out.print ( "middle" ) ;
}
System.out.print ("outer") ;
}
}
结果是()
Given:
11. static class A {
12. void process() throws Exception { throw new Exception(); }
13. }
14. static class B extends A {
15. void process() { System.out.println("B "); }
16. }
17. public static void main(String[] args) {
18. A a = new B();
19. a.process();
20. }
What is the result? ()
public class X {
public static void main(String [] args) {
try {
badMethod();
System.out.print(“A”);
}
catch (RuntimeException ex) {
System.out.print(“B”);
}
catch (Exception ex1) {
System.out.print(“C”);
}
finally {
System.out.print(“D”);
}
System.out.print(“E”);
}
public static void badMethod() {
throw new RuntimeException();
}
}
What is the result?()
public class Test {
public static void aMethod() throws Exception {
try {
throw new Exception();
} finally {
System.out.println(“finally”);
}
}
public static void main(String args[]) {
try {
aMethod();
} catch (Exception e) {
System.out.println(“exception”);
}
System.out.println(“finished”);
}
}
What is the result?()
11. static class A {
12. void process() throws Exception { throw new Exception(); }
13. }
14. static class B extends A {
15. void process() { System.out.println(”B”); }
16. }
17. public static void main(String[] args) {
18. new B().process();
19. }
What is the result?()
11. static classA {
12. void process() throws Exception { throw new Exception(); }
13. }
14. static class B extends A {
15. void process() { System.out.println(”B “); }
16. }
17. public static void main(String[] args) {
18.A a=new B();
19. a.process();
20.}
What is the result?()
import java.io.IOException;
public class ExceptionTest(
public static void main (Stringargs)
try (
methodA();
) catch (IOException e) (
system.out.printIn(“Caught IOException”);
) catch (Exception e) (
system.out.printIn(“Caught Exception”);
)
)
public void methodA () {
throw new IOException ();
}
What is the result?()
1. class Exc0 extends Exception { }
2. class Exc1 extends Exc0 { }
3. public class Test {
4. public static void main(String args[]) {
5. try {
6. throw new Exc1();
7. } catch (Exc0 e0) {
8. System.out.println(“Ex0 caught”);
9. } catch (Exception e) {
10. System.out.println(“exception caught”);
11. }
12. }
13. }
What is the result?()
现有:
class ThreadExcept implements Runnable {
public void run() { throw new RuntimeException("exception "); }
public static void main(String [] args) {
new Thread(new ThreadExcept()).start();
try {
int x = Integer.parseInt(args[0]);
Thread.sleep(x);
System.out.print("main ");
} catch (Exception e) { }
}
}
和命令行:
java ThreadExcept 1000
哪一个是结果?()
现有:
class ThreadExcept implements Runnable {
public void run() { throw new RuntimeException("exception "); }
public static void main(Stri_ng [] args) {
new Thread (new ThreadExcept()).start();
try {
int x=Integer.parselnt (args [0]);
Thread. sleep (x);
System.out.print("main");
} catch (Exception e) { }
}
}
和命令行: java ThreadExcept l000
哪一个是结果?()
11.classA {
12. public void process() { System.out.print(”A “); } }
13. class B extends A {
14. public void process() throws RuntimeException {
15. super.process();
16. if (true) throw new RuntimeException();
17. System.out.print(“B”); }}
18. public static void main(String[] args) {
19. try { ((A)new B()).process(); }
20. catch (Exception e) { System.out.print(”Exception “); }
21. }
What is the result?()
11.classa {
12. public void process() { System.out.print(”a,”); } }
13. class b extends a {
14. public void process() throws IOException {
15. super.process();
16. System.out.print(”b,”);
17. throw new IOException();
18. } }
19. public static void main(String[] args) {
20. try { new b().process(); }
21. catch (IOException e) { System.out.println(”Exception”); } }
What is the result?()
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