更多"public class TestA{ "的相关试题:
[单项选择] class TestA { public void start() { System.out.println(”TestA”); } } public class TestB extends TestA { public void start() { System.out.println(”TestB”); } public static void main(String[] args) { ((TestA)new TestB()).start(); } } What is the result?()
A. TestA
B. TestB
C. Compilation fails.
D. An exception is thrown at runtime.
[单项选择] 1. interface TestA { String toString(); } 2. public class Test { 3. public static void main(String[] args) { 4. System.out.println(new TestA() { 5. public String toString() { return “test”; } 6. } 7. } 8. } What is the result?()
A. test
B. null
C. An exception is thrown at runtime.
D. Compilation fails because of an error in line 1.
E. Compilation fails because of an error in line 4.
F. Compilation fails because of an error in line 5.
[单项选择] public class TestA{ public void methodA() throws IOException{ //…… } } public class TestB extends TestA{ public void methodA() throws EOFException{ //…… } } public class TestC extends TestA{ public void methodA() throws Exception{ //…… } } 当编译类TestC的时候,结果是哪项?()
A. 正常
B. 编译错误
C. 运行错误
D. 以上都不对
[单项选择] 现有: class TestA { public void start() { System.out.println("TestA"); } } public class TestB extends TestA { public void start() { System.out.println("TestB"); } public static void main (string[] args) ( ((TestA)new TestB()).start(); ) } 运行结果是哪项?()
A. TeStA
B. TeStB
C. 编译失败
D. 运行时抛出异常
[多项选择]
下列解释正确的是()
A. out_applet.java中一定有一个参数是“display_string”
B.
具有两个属性“name”和“value”
C. value是参数的名称
D. “good morning”通过
标记传递给“Our_Applet.class”
[简答题] 一般程序如下: ORG 2000H ARY DW --4,3,--2,1 CNT DW $--ARY VAR DW ARY,$+4 ┆ MOV AX,ARY MOV BX,OFFSET VAR MOV CX,CNT MOV DX,VAR+2 LEA SI,ARY ┆ 此程序段执行后,寄存器AX,BX,CX,DX与SI中的内容各是多少?
[单项选择] 现有: 1 Interface F{} 2 class A implements F{} 3 class B extends A{} 4 class C extends B{ 5 public static void main(String[] args){ 6 B b=new B(); 7 //inSert C0de here 8 } 9 } 下列哪行代码插入到第7行,将抛出java.lang.ClassCaseException异常()
A. A a=b;
B. F f= (C)b;
C. F f= (A)b;
D. B bb= (B)(A)b;
[单项选择] 现有: class Pencil { public void write (String content){ System.out.println ("Write"+content); } } class RubberPencil extends Pencil{ public void erase (String content){ System.out.println ("Erase"+content); } } 执行下列代码的结果是哪项?() Pencil pen=new RubberPencil(); pen.write ("Hello"); pen.erase ("Hello");
A. Write Hello Erase Hello
B. Erase Hello Write Hello
C. 编译错误
D. 运行时抛出异常
[多项选择] public class Foo { private int val; public foo(int v) (val = v;) } public static void main (String args) { Foo a = new Foo (10); Foo b = new Foo (10); Foo c = a; int d = 10; double e = 10.0; } Which three logical expression evaluate to true? ()
A. (a ==c)
B. (d ==e)
C. (b ==d)
D. (a ==b)
E. (b ==c)
F. (d ==10.0)
[单项选择] public class Pet{ private String name; public Pet(){ System.out.print(1); } public Pet(String name){ System.out.print(2); } } public class Dog extends Pet{ public Dog(String name){ System.out.print(3); } } 执行new Dog(“棕熊”);后程序输出是哪项?()
A. 23
B. 13
C. 123
D. 321
[单项选择] 现有 public class Parentt public void change (int x){) ) public class Child extends Parent{ //覆盖父类change方法 } 下列哪个声明是正确的覆盖了父类的change方法?()
A. protected void change (int x){}
B. public void change(int x, int y){}
C. public void change (int x){}
D. public void change (String s){}
[单项选择] class TestMain { static int x = 2; static { x = 4; } public static void main(String... args) { int y = x + 1; System.out.println(y); } } 和命令行: java TestMain 结果为:()
A. 3
B. 5
C. 编译失败
D. 运行时异常被抛出
[单项选择] A System p customer has installed components from the Linux ToolBox. By default, which of the following directories will contain the open source commands such as gzip, gunzip and zcat()
A. /opt/freeware/bin
B. /usr/bin/freeware
C. /var/freeware/bin
D. /usr/sbin/freeware
[单项选择] You work with a SQL Server 2005 database that provides banking information for customers. You want customers to see banking reports that combine data that is retrieved from the database with real-time investment information that comes from a Web service provided by a third party. The investment information must be current when the reports are executed. You need to create the appropriate objects that support the reports. What should you do?()
A. Publish the data in the database as an XML Web service by using the FOR XML AUTO clause.
B. Create a table to store the banking information for each customer. Create a trigger that fires when data is inserted into the table that joins with the data coming from the Web service.
C. Create a Transact-SQL stored procedure that uses a temporary table to store the banking information for each customer. Update the table with the values from the Web service.
D. Have a developer in your company create an assembly that calls the remote Web service. Create aCLR function by using the assembly. Call the CLR function and combine the results with banking information in the database.
[单项选择] 现有: class Pencil { public void write (String content){ System.out.println ("Write"+content); } } class RubberPencil extends Pencil{ public void write (String content){ System.out.println ("Rubber Write"+content); } public void erase (String content){ System.out.println ("Erase "+content); } } 执行下列代码的结果是哪项?() Pencil pen=new RubberPencil(); pen.write("Hello");
A. Write Hello
B. Rubber Write Hello
C. 编译错误
D. 运行时抛出异常