单项选择题
class Super {
public Integer getLenght() { return new Integer(4); }
}
public class Sub extends Super {
public Long GetLenght() { return new Long(5); }
public static void main(String[] args) {
Super sooper = new Super();
Sub sub = new Sub();
System.out.println(
sooper.getLenght().toString() + “,” +
sub.getLenght().toString() );
}
}
What is the output?()
A. 4,4
B. 4,5
C. 5,4
D. 5,5
E. Compilation fails.
相关考题
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单项选择题
1.packagefoo;2.3.importjava.util.Vector;4.5.protectedclassMyVectorVector{6.initi=1;7.publicMyVector(){8.i=2;9.}10.}11.12.publicclassMyNewVectorextendsMyVector{13.publicMyNewVector(){14.i=4;15.}16.publicstaticvoidmain(Stringargs[]){17.MyVectorv=newMyNewVector();18.}19.}Whatistheresult?()
A. Compilation succeeds.
B. Compilation fails because of an error at line 5.
C. Compilation fails because of an error at line 6.
D. Compilation fails because of an error at line 14.
E. Compilation fails because of an error at line 17. -
单项选择题
public class Alpha1 { public static void main( String[] args ) { boolean flag; int i=0; do { flag = false; System.out.println( i++ ); flag = i < 10; continue; } while ( (flag)? true:false ); } } What is the result?()
A. 000000000
B. 0123456789
C. Compilation fails.
D. The code runs with no output.
E. The code enters an infinite loop.
F. An exception is thrown at runtime. -
单项选择题
ClassOne.java:1.packagecom.abe.pkg1;2.publicclassClassOne{3.privatecharvar=‘a’;4.chargetVar(){returnvar;}5.}ClassTest.java:1.packagecom.abe.pkg2;2.importcom.abc.pkg1.ClassOne;3.publicclassClassTestextendsClassOne{4.publicstaticvoidmain(String[]args){5.chara=newClassOne().getVar();6.charb=newClassTest().getVar();7.}8.}Whatistheresult?()
A. Compilation fails.
B. Compilation succeeds and no exceptions are thrown.
C. An exception is thrown at line 5 in ClassTest.java.
D. An exception is thrown at line 6 in ClassTest.java.