abstract class abstrctIt {
abstract float getFloat （）；
}
public class AbstractTest extends AbstractIt {
private float f1= 1.0f；
private float getFloat （） {return f1；}
}
What is the result？ （）
A. Compilation is successful.
B. An error on line 6 causes a runtime failure.
C. An error at line 6 causes compilation to fail.
D. An error at line 2 causes compilation to fail.
您可能感兴趣的试卷
你可能感兴趣的试题
A. Public
B. Private
C. Protected
D. Transient
E. No access modifier is qualified
A. Public double methoda（）；
B. Static void methoda （double d1） {}
C. Public native double methoda（）；
D. Abstract public void methoda（）；
E. Protected void methoda （double d1）{}
public class foo {
public static void main （Stringargs） {
String s；
system.out.printIn （“s=” + s）；
}
}
What is the result？（）
A. The code compiles and “s=” is printed.
B. The code compiles and “s=null” is printed.
C. The code does not compile because string s is not initialized.
D. The code does not compile because string s cannot be referenced.
E. The code compiles， but a NullPointerException is thrown when toString is called.
int index = 1；
int foo[] = new int [3];
int bar = foo [index]
int baz = bar + index；
A.整型变量 baz 的值为 0
B.整型变量baz 的值为 1
C.整型变量 baz 的值为 2
D.执行错误
public class test（
public static void main（stringargs）{
string foo = args [1]；
string foo = args ；
string foo = args ；
}
）
And command line invocation： Java Test red green blue What is the result？ （）
A. Baz has the value of “”
B. Baz has the value of null
C. Baz has the value of “red”
D. Baz has the value of “blue”
E. Bax has the value of “green”
F. The program throws an exception.
int index = 1；
boolean test = new Boolean；
boolean foo= test [index]；
What is the result？（）
A. Foo has the value of 0.
B. Foo has the value of null.
C. Foo has the value of true.
D. Foo has the value of false.
E. An exception is thrown.
F. The code will not compile.
A. Float foo = -1；
B. Float foo = 1.0；
C. Float foo = 42e1；
D. Float foo = 2.02f；
E. Float foo = 3.03d；
F. Float foo = 0x0123；
A. Run
B. Import
C. Default
D. Implement
//point X
public class foo （
public static void main （Stringargs） throws Exception {
printWriter out = new PrintWriter （new ）
java.io.outputStreamWriter （System.out）， true；
out.printIn（“Hello”）；
}
）
Which statement at PointX on line 1 allows this code to compile and run？（）
A. Import java.io.PrintWriter；
B. Include java.io.PrintWriter；
C. Import java.io.OutputStreamWriter；
D. Include java.io.OutputStreamWriter；
E. No statement is needed.
interface foo {
int k = 0；
}
public class test implements Foo （
public static void main（String args） （
int i；
Test test = new test （）；
i= test.k；
i= Test.k；
i= Foo.k；
）
）
What is the result？ （）
A. Compilation succeeds.
B. An error at line 2 causes compilation to fail.
C. An error at line 9 causes compilation to fail.
D. An error at line 10 causes compilation to fail.
E. An error at line 11 causes compilation to fail.
最新试题
What is the result？（）
Given： foo and bar are public references available to many other threads， foo refers to a Thread and bar is an Object. The thread foo is currently executing bar.wait（）. From another thread， what provides the most reliable way to ensure that foo will stop executing wait（）？（）
Which statement is true？（）
A programmer must create a generic class MinMax and the type parameter of MinMax must implement Comparable. Which implementation of MinMax will compile？（）
What is the result？（）
Which two can be results？（）
What is the result？（）
What is the appropriate definition of the hashCode method in class Person？（）
Which three will compile and run without exception？（）
Which statement is true？（）