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单选题
Which statements, when inserted at the indicated position in the following code, will cause a runtime exception when attempting to run the program?() class A {} class B extends A {} class C extends A {} public class Q3ae4 { public static void main(String args[]) { A x = new A(); B y = new B(); C z = new C(); // insert statement here } }
A
x = y;
B
z = x;
C
y = (B) x;
D
z = (C) y;
E
y = (A) y;
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Given:Which two, inserted at line 11, will allow the code to compile?()
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In which two cases does the compiler supply a default constructor for class A?() A、 class A{}B、 class A { public A(){} }C、 class A { public A(int x){} }D、 class Z {} class A extends Z { void A(){} }
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Which statements can be inserted at the indicated position in the following code to make the program write 1 on the standard output when run?() public class Q4a39 { int a = 1; int b = 1; int c = 1; class Inner { int a = 2; int get() { int c = 3; // insert statement here return c; } } Q4a39() { Inner i = new Inner(); System.out.println(i.get()); } public static void main(String args[]) { new Q4a39(); } } A、c = b;B、c = this.a;C、c = this.b;D、c = Q4a39.this.a;E、c = c;
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Which statements concerning the following code are true?() class a { public a() {} public a(int i) { this(); } } class b extends a { public boolean b(String msg) { return false; } } class c extends b { private c() { super(); } public c(String msg) { this(); } public c(int i) {} } A、The code will fail to compile.B、The constructor in a that takes an int as an argument will never be called as a result of constructing an object of class b or c.C、Class c has three constructors.D、Objects of class b cannot be constructed.E、At most one of the constructors of each class is called as a result of constructing an object of class c.
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interface Data { public void load(); } abstract class Info { public abstract void load(); } Which class correctly uses the Data interface and Info class?() A、 public class Employee extends Info implements Data { public void load() { /*do something*/ } }B、 public class Employee implements Info extends Data { public void load() { /*do something*/ } }C、 public class Employee extends Info implements Data { public void load() { /*do something */ } public void Info.load() { /*do something*/ } }D、 public class Employee implements Info extends Data { public void Data.load() { /*dsomething */ } public void load() { /*do something */ } }E、 public class Employee implements Info extends Data { public void load() { /*do something */ } public void Info.load(){ /*do something*/ } }F、 public class Employee extends Info implements Data{ public void Data.load() { /*do something*/ } public void Info.load() { /*do something*/ } }
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Which statements, when inserted at the indicated position in the following code, will cause a runtime exception when attempting to run the program?() class A {} class B extends A {} class C extends A {} public class Q3ae4 { public static void main(String args[]) { A x = new A(); B y = new B(); C z = new C(); // insert statement here } } A、x = y;B、z = x;C、y = (B) x;D、z = (C) y;E、y = (A) y;
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class One { public One foo() { return this; } } class Two extends One { public One foo() { return this; } } class Three extends Two { // insert method here } Which two methods, inserted individually, correctly complete the Three class?()A、 public void foo() { }B、 public int foo() { return 3; }C、 public Two foo() { return this; }D、 public One foo() { return this; }E、 public Object foo() { return this; }
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Given the following code, write a line of code that, when inserted at the indicated location, will make the overriding method in Extension invoke the overridden method in class Base on the current object. class Base { public void print( ) { System.out.println("base"); } } class Extention extends Base { public void print( ) { System.out.println("extension"); // insert line of implementation here } } public class Q294d { public static void main(String args[]) { Extention ext = new Extention( ); ext.print( ); } } Fill in a single line of implementation.()
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考题
单选题public class TestSeven extends Thread { private static int x; public synchronized void doThings() { int current = x; current++; x = current; } public void run() { doThings(); } } Which is true?()A
Compilation fails.B
An exception is thrown at runtime.C
Synchronizing the run() method would make the class thread-safe.D
The data in variable “x” are protected from concurrent access problems.E
Declaring the doThings() method as static would make the class thread-safe.F
Wrapping the statements within doThings() in a synchronized(new Object()) {} block would make the class thread-safe.
考题
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多选题Given the following class, which statements can be inserted at position 1 without causing the code to fail compilation?() public class Q6db8 { int a; int b = 0; static int c; public void m() { int d; int e = 0; // Position 1 } }Aa++;Bb++;Cc++;Dd++;Ee++;
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多选题Which statements can be inserted at the indicated position in the following code to make the program write 1 on the standard output when run?() public class Q4a39 { int a = 1; int b = 1; int c = 1; class Inner { int a = 2; int get() { int c = 3; // insert statement here return c; } } Q4a39() { Inner i = new Inner(); System.out.println(i.get()); } public static void main(String args[]) { new Q4a39(); } }Ac = b;Bc = this.a;Cc = this.b;Dc = Q4a39.this.a;Ec = c;
考题
单选题class Base { Base() { System.out.print(“Base”); } } public class Alpha extends Base { public static void main( String[] args ) { new Alpha(); new Base(); } } What is the result?()A
BaseB
BaseBaseC
Compilation fails.D
The code runs with no output.E
An exception is thrown at runtime.
考题
单选题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
TestAB
TestBC
Compilation fails.D
An exception is thrown at runtime.
考题
单选题class One { public One() { System.out.print(1); } } class Two extends One { public Two() { System.out.print(2); } } class Three extends Two { public Three() { System.out.print(3); } } public class Numbers{ public static void main( String[] argv) { new Three(); } } What is the result when this code is executed?()A
1B
3C
123D
321E
The code rims with no output.
考题
多选题public abstract class Shape { private int x; private int y; public abstract void draw(); public void setAnchor(int x, int y) { this.x = x; this.y = y; } } Which two classes use the Shape class correctly?()Apublic class Circle implements Shape { private int radius; }Bpublic abstract class Circle extends Shape { private int radius; }Cpublic class Circle extends Shape { private int radius; public void draw(); }Dpublic abstract class Circle implements Shape { private int radius; public void draw(); }Epublic class Circle extends Shape { private int radius;public void draw() {/* code here */} }Fpublic abstract class Circle implements Shape { private int radius;public void draw() { / code here */ } }
考题
单选题interface Data { public void load(); } abstract class Info { public abstract void load(); } Which class correctly uses the Data interface and Info class?()A
public class Employee extends Info implements Data { public void load() { /*do something*/ } }B
public class Employee implements Info extends Data { public void load() { /*do something*/ } }C
public class Employee extends Info implements Data { public void load() { /*do something */ } public void Info.load() { /*do something*/ } }D
public class Employee implements Info extends Data { public void Data.load() { /*dsomething */ } public void load() { /*do something */ } }E
public class Employee implements Info extends Data { public void load() { /*do something */ } public void Info.load(){ /*do something*/ } }F
public class Employee extends Info implements Data{ public void Data.load() { /*do something*/ } public void Info.load() { /*do something*/ } }
考题
单选题public class ExceptionTest { class TestException extends Exception {} public void runTest () throws TestException {} public void test () /* Point X*/ { runTest (); } } At point X on line 4, which code can be added to make the code compile?()A
Throws Exception.B
Catch (Exception e).C
Throws RuntimeException.D
Catch (TestException e).E
No code is necessary.
考题
单选题What will be written to the standard output when the following program is run?() class Base { int i; Base() { add(1); } void add(int v) { i += v; } void print() { System.out.println(i); } } class Extension extends Base { Extension() { add(2); } void add(int v) { i += v*2; } } public class Qd073 { public static void main(String args[]) { bogo(new Extension()); } static void bogo(Base b) { b.add(8); b.print(); } }A
9B
18C
20D
21E
22
考题
单选题Which statements, when inserted at the indicated position in the following code, will cause a runtime exception when attempting to run the program?() class A {} class B extends A {} class C extends A {} public class Q3ae4 { public static void main(String args[]) { A x = new A(); B y = new B(); C z = new C(); // insert statement here } }A
x = y;B
z = x;C
y = (B) x;D
z = (C) y;E
y = (A) y;
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