题目内容

运行类C的输出结果为?()class A { public A() { System.out.println( "The default constructor of A is invoked"); }} class B extends A { public B() { System.out.println( "The default constructor of B is invoked"); }} public class C { public static void main(String[] args) { B b = new B(); }}

A. 无任何显示
B. "The default constructor of B is invoked"
C. "The default constructor of A is invoked""The default constructor of B is invoked"
D. "The default constructor of B is invoked""The default constructor of A is invoked"

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A. 32
B. 312
C. 13
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B. 21
C. 抛出异常
D. 由于多个error编译出错

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Java语言与C++语言相比,最突出的特点()

A. 面向对象
B. 有类库
C. 高性能
D. 跨平台

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以下语句哪个用于创建线程池?()

A. ExecutorService executor = Executors.newCachedThreadPool();
B. ExecutorService executor = Executors.newCachedThreadPool(1);
C. ExecutorService executor = Executors.newCachedThreadPool(2);
D. ExecutorService executor = Executors.newCachedThreadPool(3);

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运行类C的输出结果为?()class A { public A() { System.out.println( "The default constructor of A is invoked"); }} class B extends A { public B() { System.out.println( "The default constructor of B is invoked"); }} public class C { public static void main(String[] args) { B b = new B(); }}

A. 无任何显示 B. "The default constructor of B is invoked" C. "The default constructor of A is invoked""The default constructor of B is invoked" D. "The default constructor of B is invoked""The default constructor of A is invoked"

Java语言与C++语言相比,最突出的特点()

以下语句哪个用于创建线程池?()

A. 无任何显示
B. "The default constructor of B is invoked"
C. "The default constructor of A is invoked""The default constructor of B is invoked"
D. "The default constructor of B is invoked""The default constructor of A is invoked"