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单选题
public class Base { public static final String FOO = “foo”; public static void main(String[] args) { Base b = new Base(); Sub s = new Sub(); System.out.print(Base.FOO); System.out.print(Sub.FOO); System.out.print(b.FOO); System.out.print(s.FOO); System.out.print(((Base)s).FOO); } } class Sub extends Base {public static final String FOO=bar;} What is the result?()
A
foofoofoofoofoo
B
foobarfoobarbar
C
foobarfoofoofoo
D
foobarfoobarfoo
E
barbarbarbarbar
F
foofoofoobarbar
G
foofoofoobarfoo
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更多 “单选题public class Base { public static final String FOO = “foo”; public static void main(String[] args) { Base b = new Base(); Sub s = new Sub(); System.out.print(Base.FOO); System.out.print(Sub.FOO); System.out.print(b.FOO); System.out.print(s.FOO); System.out.print(((Base)s).FOO); } } class Sub extends Base {public static final String FOO=bar;} What is the result?()A foofoofoofoofooB foobarfoobarbarC foobarfoofoofooD foobarfoobarfooE barbarbarbarbarF foofoofoobarbarG foofoofoobarfoo” 相关考题
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public class Foo { public static void main(String[] args) { try { return; } finally { System.out.println( “Finally” ); } } } What is the result?()A、 FinallyB、 Compilation fails.C、 The code runs with no output.D、 An exception is thrown at runtime.
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考题
public class Foo { public int a; public Foo() { a = 3; } public void addFive() { a += 5; } } and: public class Bar extends Foo { public int a; public Bar() { a = 8; } public void addFive() { this.a +=5; } } invoked with: Foo foo = new Bar(); foo.addFive(); System.out.println(”Value: “+ foo.a); What is the result?() A、 Value: 3B、 Value: 8C、 Value: 13D、 Compilation fails.E、 The code runs with no output.F、 An exception is thrown at runtime.
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单选题public class Foo { public int a; public Foo() { a = 3; } public void addFive() { a += 5; } } and: public class Bar extends Foo { public int a; public Bar() { a = 8; } public void addFive() { this.a +=5; } } invoked with: Foo foo = new Bar(); foo.addFive(); System.out.println(”Value: “+ foo.a); What is the result?()A
Value: 3B
Value: 8C
Value: 13D
Compilation fails.E
The code runs with no output.F
An exception is thrown at runtime.
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Baz has the value of “”B
Baz has the value of nullC
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.
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单选题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 nullC
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.
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单选题public class Test { public static void main (String args) { class Foo { public int i = 3; } Object o = (Object) new Foo(); Foo foo = (Foo)o; System.out.printIn(foo. i); } } What is the result?()A
Compilation will fail.B
Compilation will succeed and the program will print “3”C
Compilation will succeed but the program will throw a ClassCastException at line 6.D
Compilation will succeed but the program will throw a ClassCastException at line 7.
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单选题10. interface Foo { int bar(); } 11. public class Sprite { 12. public int fubar( Foo foo) { return foo.bar(); } 13. public void testFoo() { 14. fubar( 15. // insert code here 16.); 17. } 18. } Which code, inserted at line 15, allows the class Sprite to compile?()A
Foo { public int bar() { return 1; } }B
new Foo { public int bar() { return 1; } }C
newFoo() { public int bar(){return 1; } }D
new class Foo { public int bar() { return 1; } }
考题
单选题public class Test { public static void main (String [] args) { string foo = “blue”; string bar = foo; foo = “green”; System.out.printIn(bar); } } What is the result?()A
An exception is thrown.B
The code will not compile.C
The program prints “null”D
The program prints “blue”E
The program prints “green”
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单选题public class Test { public static void main(String args[]) { class Foo { public int i = 3; } Object o = (Object)new Foo(); Foo foo = (Foo)o; System.out.println(“i = “ + foo.i); } } What is the result?()A
i = 3B
Compilation fails.C
A ClassCastException is thrown at line 6.D
A ClassCastException is thrown at line 7.
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多选题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)
考题
单选题public class Foo { public static void main (String []args) { int i = 1; int j = i++; if ((i++j) (i++ ==j)) { i +=j; } } } What is the final value of i?()A
1B
2C
3D
4E
5
考题
单选题public class Delta { static boolean foo(char c) { System.out.print(c); return true; } public static void main( String[] argv ) { int i =0; for ( foo(‘A’); foo(‘B’)(i2); foo(‘C’)){ i++ ; foo(‘D’); } } } What is the result?()A
ABDCBDCBB
ABCDABCDC
Compilation fails.D
An exception is thrown at runtime.
考题
单选题1.public class Test { 2.public static void main (String args[]) { 3.class Foo { 4.public int i = 3; 5.} 6.Object o = (Object) new Foo(); 7.Foo foo = (Foo)o; 8.System.out.printIn(foo. i); 9. } 10.} What is the result?()A
Compilation will fail.B
Compilation will succeed and the program will print “3”C
Compilation will succeed but the program will throw a ClassCastException at line 6.D
Compilation will succeed but the program will throw a ClassCastException at line 7.
考题
单选题public class Foo { static int[] a; static { a[0]=2; } public static void main( String[] args) {} } Which exception or error will be thrown when a programmer attempts to run this code?()A
java.lang. StackOverflowErrorB
java.lang.IllegalStateExceptionC
java.lang.ExceptionlnlnitializerErrorD
java.lang.ArraylndexOutOfBoundsException
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