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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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更多 “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(){} }” 相关考题
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考题 多选题public class X {  public X aMethod() { return this;}  }  public class Y extends X {  }  Which two methods can be added to the definition of class Y?()Apublic void aMethod() {}Bprivate void aMethod() {}Cpublic void aMethod(String s) {}Dprivate Y aMethod() { return null; }Epublic X aMethod() { return new Y(); }

考题 多选题In which two cases does the compiler supply a default constructor for class A?()Aclass A{}Bclass A { public A(){} }Cclass A { public A(int x){} }Dclass Z {} class A extends Z { void A(){} }

考题 多选题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?()Apublic void foo() { }Bpublic int foo() { return 3; }Cpublic Two foo() { return this; }Dpublic One foo() { return this; }Epublic Object foo() { return this; }

考题 单选题public class SomeException {  } Class a:  public class a {  public void doSomething() { }  } Class b:  public class b extends a {  public void doSomething() throws SomeException { }  }  Which is true about the two classes?()A  Compilation of both classes will fail.B  Compilation of both classes will succeed.C  Compilation of class a will fail. Compilation of class b will succeed.D  Compilation of class a will fail. Compilation of class a will succeed.

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 多选题Which two statements are true regarding the creation of a default constructor?()AThe default constructor initializes method variables.BThe compiler always creates a default constructor for every class.CThe default constructor invokes the no-parameter constructor of the superclass.DThe default constructor initializes the instance variables declared in the class.EWhen a class has only constructors with parameters, the compiler does not create a default constructor.

考题 单选题What produces a compiler error?()A  class A { public A(int x) {} }B  class A {} class B extends A { B() {} }C  class A { A() {} } class B { public B() {} }D  class Z { public Z(int) {} } class A extends Z {}

考题 多选题Which two allow the class Thing to be instantiated using new Thing()?Apublic class Thing { }Bpublic class Thing { public Thing() {} }Cpublic class Thing { public Thing(void) {} }Dpublic class Thing { public Thing(String s) {} }Epublic class Thing { public void Thing() {} public Thing(String s) {} }