10. public class SuperCaic { 11. protected static int multiply(int a, int b) { return a * b; } 12. } and: 20. public class SubCalc extends SuperCalc { 21. public static int multiply(int a, int b) { 22. int c = super.multiply(a, b); 23. return c; 24. } 25. } and: 30. SubCalc sc = new SubCalc(); 31. System.out.println(sc.multiply(3,4)); 32. System.out.println(SubCalc.multiply(2,2)); What is the result?()
第1题:
下面程序的输出结果是什么? class C1{ static int j=0; public void method(int a){ j++; } } class Test extends C1{ public int method(){ return j++; } public void result(){ method(j); System.out.println(j+method()); } public static void main(String args[]){ new Te
A.0
B.1
C.2
D.3
第2题:
能将程序补充完整的选项是 class Person { private int a; public int change(int m){return m; } } public class Teacher extends Person { public int b; public static void main(String arg[]) { Person p=new Person(); Teacher t=new Teacher(); int i; ______ } }
A.i=m
B.i=b
C.i=p.a
D.i=p.change(50)
第3题:
1. class A { 2. public int getNumber(int a) { 3. return a + 1; 4. } 5. } 6. 7. class B extends A { 8. public int getNumber (int a) { 9. return a + 2 10. } 11. 12. public static void main (String args[]) { 13. A a = new B(); 14. System.out.printIn(a.getNumber(0)); 15. } 16. } What is the result?()
第4题:
Which are syntactically valid statement at// point x?() class Person { private int a; public int change(int m){ return m; } } public class Teacher extends Person { public int b; public static void main(String arg[]){ Person p = new Person(); Teacher t = new Teacher(); int i; // point x } }
第5题:
Given: 1. public class Method Over { 2. public void set Var (int a, int b, float c) { 3. } 4. } Which two overload the set Var method()?
第6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?()
第7题:
11. abstract class Vehicle { public int speed() { return 0; } } 12. class Car extends Vehicle { public int speed() { return 60; } } 13. class RaceCar extends Car { public int speed() { return 150; }} ...... 21. RaceCar racer = new RaceCar(); 22. Car car = new RaceCar(); 23. Vehicle vehicle = new RaceCar(); 24. System.out.println(racer.speed() + “, „ + car.speed() 25. + “, “+ vehicle.speed()); What is the result?()
第8题:
public class MethodOver { public void setVar (int a, int b, float c) { } } Which two overload the setVar method?()
第9题:
class A { public int getNumber(int a) { return a + 1; } } class B extends A { public int getNumber (int a) { return a + 2 } public static void main (String args) { A a = new B(); System.out.printIn(a.getNumber(0)); } } What is the result? ()
第10题:
i = m;
i = b;
i = p.a;
i = p.change(30);
i = t.b.
第11题:
14
编译错误
120
24
第12题:
14
编译错误
120
24
第13题:
A.Foo { public int bar() { return 1; }
B.new Foo { public int bar() { return 1; }
C.new Foo() { public int bar() { return 1; }
D.new class Foo { public int bar() { return 1; }
第14题:
下列程序段中,正确的是______。 ①class MvClass { int var = 100; static int getVar() { return var; } } ②public class MyClass { final int date; void MyClass (int d) { date = d; } } ③public class MyMain { public static void main(String args[]) { System.out.println(Myclass1.date); } } class MyClass1 { int data = 10; } ④class IamAbstract { final int f; double d; abstrct void method(); }
A.②④
B.①③
C.②
D.以上都不对
第15题:
class A { protected int method1(int a, int b) { return 0; } } Which two are valid in a class that extends class A?()
第16题:
class TestApp{ public static void main(String[] args){ System.out.println(multiply(2,3,4,5)); } public int multiply(int… nums){ int result = 1; for(int x :nums) result *= x; //result =result*x; return result; } } 2、6、24、120 程序运行后的输出是哪项?()
第17题:
1. class Super { 2. private int a; 3. protected Super(int a) { this.a = a; } 4. } ..... 11. class Sub extends Super { 12. public Sub(int a) { super(a); } 13. public Sub() { this.a= 5; } 14. } Which two, independently, will allow Sub to compile?()
第18题:
现有: 1. class Synapse { 2. protected int gap() { return 7; } 3. } 4. 5. class Creb extends Synapse { 6. // insert code here 7. } 分别插入到第 6 行,哪三行可以编译?()
第19题:
public class Parent { public int addValue( int a, int b) { int s; s = a+b; return s; } } class Child extends Parent { } Which methods can be added into class Child?()
第20题:
class TestApp{ public static void main(String[] args){ System.out.println(multiply(2,3,4,5)); } public int multiply(int... nums){ int result=1; for(int x:nums) result*=x; return result; } } 程序运行后的输出是哪项?()
第21题:
1. public class Blip { 2. protected int blipvert(int x) { return 0; } 3. } 4. class Vert extends Blip { 5. // insert code here 6. } Which five methods, inserted independently at line 5, will compile?()
第22题:
Change line 2 to: public int a;
Change line 2 to: protected int a;
Change line 13 to: public Sub() { this(5); }
Change line 13 to: public Sub() { super(5); }
Change line 13 to: public Sub() { super(a); }
第23题:
12 4
The code runs with no output.
An exception is thrown at runtime.
Compilation fails because of an error in line 21.
Compilation fails because of an error in line 22.
Compilation fails because of an error in line 31.