设有代码如下: class FrameInout extends Frame. implements ActionListener { Butto。() 此题为判断题(对,错)。
设有代码如下: class FrameInout extends Frame. implements ActionListener { Butto。()
此题为判断题(对,错)。
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给出下列代码,可放在类A的横线位置作为A合理的内部类的是( )。 class A { protected int i; A(int i) { this.i = i; } ______ }A.class B { }B.class B extends A { }C.class B implements A { }D.class A { }
下列哪个类声明是正确的?A.abstract class G2 extends superClassl,superClass2{……}B.abstract public class classmates{……}C.public final class NewClass extends superClass implements Interfacel{……}D.public abstract class String{……}
下列类头定义中,错误的是( )。 A.class x { .... }B.public x extends y { .... }C.public class x extends y { .... }D.class x extends y implements y1 { .... }
如果有-个类MyFrame是Frame的子类,但它不能被实例化,请写出该类的声明头为( )。A.abstract class Frame. extends MyFrameB.abstract class MyFrame. extends FrameC.class MyFrame. abstract extends FrameD.class Frame. abstract extends MyFrame.
现有两个类A,B,以下描述中表示B继承自A的是 ( )A.class A extends BB.class B implements AC.class A implements BD.class B extends A
下列程序实现了2个监听器接口:ActionListener和W1ndowListener。 import java.awt.*; import java.awt.event.*; public class ex39______ { public static void main(String[] args) { ex39 bj = new ex39(); obj .go(); } public void go() { Frame. f = new Frame("ex39"); f.addWindowListener(this); Button b = new Button("Button"); b.addActionListener(this); f.add(b); f.pack(); f.setVisible(true); } public void actionPerformed(ActionEvent e) { System.out.println("Button pressed!"); } public void windowActivated(WindowEvent e){} public void windowDeactivated(WindowEvent e){} public void windowClosed(WindowEvent e) {} public void windowClosing(WindowEvent e){System.exit(1); public void windowIconified(WindowEvent e){} public void windowDeiconified(WindowEvent e) {} public void windowOpened(WindowEvent e){} } 请选择正确的语句填入横线处。A.extends ActionListener, WindowListenerB.implements ActionListener, WindowListenerC.implements ActionListener; WindowListenerD.extends ActionListener; WindowListener
如果有一个类MyFrame是Frame的子类,但它不能被实例化,请写出该类的声明头为( )。A.abstract class Frame. extends MyFrameB.abstract class MyFrame. extends FrameC.class MyFrame. abstract extends FrameD.class Frame. abstract extends MyFrame.
设有如下代码:interface IFace{}class CFace implements IFace{}class Base{}public class ObRef extends Base{public static void main(String argv[]){ObRef bj = new ObRef();Base b = new Base();Object obj1 = new Object();IFace obj2 = new CFace();//Here}}则在 //Here处插入哪个代码将不出现编译和运行错误。A.obj1=obj2;B.b=obj;C.obj=b;D.obj1=b;
设有程序如下: public class jzh0319 { public static void main(String args[]) { subClass sc=new subClass(); } } class superClass { superClass() { System.out.println("父类");} } class subClass extends superClass { subClass() {System.out.println("子类"); } } 其输出结果只有一行。()此题为判断题(对,错)。
设有程序如下: public class jzh0319 { public static void main(String args[]) { subClass sc=new subClass(); } } class superClass { superClass() { System.out.println("父类");} } class subClass extends superClass { subClass() {System.out.println("子类"); } } 其输出结果的第一行是子类。()此题为判断题(对,错)。
设有程序如下: abstract class absclass { abstract void method1(); } class conclass extends absclass { public void method1() { System.out.println("子类");} } public class mainclass { public static void main(String args[]) { absclass ac1=new absclass(); //语句1 absclass ac2=new conclass(); //语句2 ac2.method1(); //语句3 } } 则main()方法中的第一条语句(即语句1)可以顺利通过编译。()此题为判断题(对,错)。
在J2EE中,对于自己编写的Servlet1,以下对Servlet1的定义正确的是()。 A、class Servlet1 implements javax.servlet.ServletB、class Servlet1 extends javax.servlet.GenericServletC、class Servlet1 extends javax.servlet.http.HttpServletD、class Servlet1 extends javax.servlet.ServletRequest
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*/ } }
现在有两个类A、B,以下描述中表示B继承自A的是()A、class A extends BB、class B implements AC、class A implementsD、class B extends A
现自: 1. interface Color { } 2. interface Weight { } 3. //insert code here 和以下足六个声明: class Boat extends Color, extends Weight { } class Boat extends Color and Weight { } class Boat extends Color, Weight { } class Boat implements Color, implements Weight { } class Boat implements Color and Weight { } class Boat implements Color, Weight { } 分别插入到第3行,有多少行可以编译? () A、 0B、 1C、 2D、 3
下列类的定义中,错误的是()。A、class x{....}B、public x extends y{....}C、public class x extends y{....}D、class x extends y implements y1{....}
下列代码正确的是哪项?() A、 public class Session implements Runnable, Clonable{ public void run ();public Object clone () ; }B、 public class Session extends Runnable, Cloneable { public void run() {/*dosomething*/} public Object clone() {/*make a copy*/} }C、 public abstract class Session implements Runnable, Clonable { public void run() {/*do something*/} public Object clone() {/*make a copy*/} }D、 public class Session implements Runnable, implements Clonable { public void run() {/*do something*/} public Object clone() {/*make a copy*/} }
现有: interface Animal { void eat () ; } //insert code here public class HouseCat extends Feline { public void eat() { } } 和五个申明 abstract class Feline implements Animal { } abstract class Feline implements Animal { void eat () ; } abstract class Feline implements Animal { public void eat();} abstract class Feline implements Animal { public void eat() {} } abstract class Feline implements Animal { abstract public void eat();} 结果为:() A、1B、2C、3D、4
现有: interface Data {public void load();} abstract class Info {public abstract void load();} 下列类定义中正确使用Data和Info的是哪项?() A、 public class Employee implements Info extends Data { public void load(){/*dosomething*/} }B、public class Employee extends Inf.implements Data{ public void load() {/*do something*/} }C、public class Empl.yee implements Inf extends Data{ public void Data.1oad(){* do something*/} public void load(){/*do something*/} }D、public class Employee extends Inf implements Data { public void Data.1oad() {/*do something*/) public void info.1oad(){/*do something*/} }
Which two demonstrate an “is a” relationship?() A、 public interface Person { } public class Employee extends Person { }B、 public interface Shape { } public class Employee extends Shape { }C、 public interface Color { } public class Employee extends Color { }D、 public class Species { } public class Animal (private Species species;)E、 interface Component { } Class Container implements Component ( Private Component[ ]children; )
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?()A、 public class Circle implements Shape { private int radius; }B、 public abstract class Circle extends Shape { private int radius; }C、 public class Circle extends Shape { private int radius; public void draw(); }D、 public abstract class Circle implements Shape { private int radius; public void draw(); }E、 public class Circle extends Shape { private int radius;public void draw() {/* code here */} }F、 public abstract class Circle implements Shape { private int radius;public void draw() { / code here */ } }
多选题Which two demonstrate an “is a” relationship?()Apublic interface Person { } public class Employee extends Person { }Bpublic interface Shape { } public class Employee extends Shape { }Cpublic interface Color { } public class Employee extends Color { }Dpublic class Species { } public class Animal (private Species species;)Einterface Component { } Class Container implements Component ( Private Component[ ]children; )
单选题下列代码正确的是哪项?()A public class Session implements Runnable, Clonable{ public void run ();public Object clone () ; }B public class Session extends Runnable, Cloneable { public void run() {/*dosomething*/} public Object clone() {/*make a copy*/} }C public abstract class Session implements Runnable, Clonable { public void run() {/*do something*/} public Object clone() {/*make a copy*/} }D public class Session implements Runnable, implements Clonable { public void run() {/*do something*/} public Object clone() {/*make a copy*/} }
单选题下列类的定义中,错误的是()。Aclass x{....}Bpublic x extends y{....}Cpublic class x extends y{....}Dclass x extends y implements y1{....}
单选题现自: 1. interface Color { } 2. interface Weight { } 3. //insert code here 和以下足六个声明: class Boat extends Color, extends Weight { } class Boat extends Color and Weight { } class Boat extends Color, Weight { } class Boat implements Color, implements Weight { } class Boat implements Color and Weight { } class Boat implements Color, Weight { } 分别插入到第3行,有多少行可以编译? ()A 0B 1C 2D 3
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*/ } }