A JavaBeans component has the following field： 11. private boolean enabled； Which two pairs of method declarations follow the JavaBeans standard for accessing this field？（）A、 public void setEnabled（ boolean enabled） public boolean getEnabled（）B、 public void setEnabled（ boolean enabled） public void isEnabled（）C、 public void setEnabled（ boolean enabled） public boolean isEnabled（）D、 public boolean setEnabled（ boolean enabled） public boolean getEnabled（）
A JavaBeans component has the following field： 11. private boolean enabled； Which two pairs of method declarations follow the JavaBeans standard for accessing this field？（）
- A、 public void setEnabled（ boolean enabled） public boolean getEnabled（）
- B、 public void setEnabled（ boolean enabled） public void isEnabled（）
- C、 public void setEnabled（ boolean enabled） public boolean isEnabled（）
- D、 public boolean setEnabled（ boolean enabled） public boolean getEnabled（）
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【Java代码】import Java.util.ArrayList;import java.util.List;（1） class AbstractFile｛protected String name;public void printName()｛System.out.println(name);｝public abstract boolean addChild(AbstractFile file);public abstract boolean removeChild(AbstractF ile file);public abstract ListAbstractFile getChildren();｝class File extends AbstractFile｛public File(String name）｛this.name＝name;｝public boolean addChild(AbstractFile file)｛return false;｝public boolean removeChild(AbstractFile file)｛return false;｝public ListAbstractFile getChildren()｛return （2） ;｝｝class Folder extends AbstractFile｛private List AbslractFile childList;public Folder(String name)｛this.name＝name;this.childList＝new ArrayListAbstractFile();｝public boolean addChild(AbstractFile file) { return childList．add(file);｝public boolean removeChild(AbstractFile file)｛return childList．remove(file);｝public （3） AbstractFile getChildren()｛return （4） ;｝｝public class Client｛public static void main(String[] args)｛//构造一个树形的文件／目录结构AbstractFile rootFolder＝ new Folder("c:\\ ");AbstractFile compositeFolder＝new Folder("composite");AbstractFile windowsFolder＝new Folder("windows");AbstractFile file＝new File("TestComposite.java");rootFolder.addChild(compositeFolder) ;rootFolder.addChild(windowsFolder);compositeFolder.addChild(file) ;//打印目录文件树printTree(rootFolder);｝private static void printTree(AbslractFile ifile)｛ifile.printName();List AbslractFile children＝ifile．getChildreno：if(children==null) return;for (AbstractFile file:children) {（5） ;｝}｝该程序运行后输出结果为：c:\compositeTestComposite.javaWindows
下列代码的编译或执行结果是______。public class MyVal{puhlic static void main(String args[]){MyVal m=new MyVal();m.aMethod();}public void aMethod(){boolean b[]=new Boolean[5];System.out.println(b[0]);}A) 1B) nullC) 0D) 编译错误A．B．C．D．
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阅读下列说明和Java代码，将应填入 (n) 处的字句写在答题纸的对应栏内。【说明】现欲构造一文件／目录树，采用组合(Composite)设计模式来设计，得到的类图如6—8所示：【Java代码】import JavA．util．ArrayList；import JavA．util．List；(1)class AbstractFile{protected String name；public void printName(){System．out．println(name)；}public abstract boolean addChild(AbstractFile file)；public abstract boolean removeChild(AbstractFile file)；public abstract ListgetChildren {}；}class File extends AbstractFile{public File(String name)(this．name=name；}public boolean addChild(AbstractFile file){return false；}public boolean removeChild(AbstractFile file){return false；}public ListgetChildren(){return (2) ；)}clasS Folder extends AbstractFile{private ListchildList；public Folder(String name){thiS．name=name；this．childList=new ArrayList{}；}public boolean addChild(AbstractFile file){return childList．add(file)；}public boolean removeChild(AbstractFile file){return childList．remove(file)；public (3)getChildren(){return (4) ；)}public class Client{public static void main(String[]args){／／构造一个树形的文件／目录结构AbstractFile rootFolder=new Folder(“C：＼”’)；AbstractFile compositeFolder=new Folder(”composite”)；AbstractFile windowsFolder=new Folder(”windows”)；AbstractFile file=new File(”TestComposite．java”)；rootFOlder．addChild (compositeFolder)；rootFolder．addChiid(windowsFolder)；compositeFolder．addChild(file)；／／打印目录文件树printTree(rootFolder)；}private static void printTree(AbstractFile ifile){ifile．PrIntName()；Listchildren：ifile．getChildren ()；if(chiidren==null)return；for(AbstractFile file：children){(5) ；}}}该程序运行后输出结果为：C：＼compositeTestComposite．javaWindows
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public class Key { private long id1； private long 1d2； // class Key methods } A programmer is developing a class Key， that will be used as a key in a standard java.util.HashMap. Which two methods should be overridden to assure that Key works correctly as a key？（）A、 public int hashCode（）B、 public boolean equals（Key k）C、 public int compareTo（Object o）D、 public boolean equals（Object o）E、 public boolean compareTo（Key k）
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多选题A JavaBeans component has the following field： 11. private boolean enabled； Which two pairs of method declarations follow the JavaBeans standard for accessing this field？（）Apublic void setEnabled（ boolean enabled） public boolean getEnabled（）Bpublic void setEnabled（ boolean enabled） public void isEnabled（）Cpublic void setEnabled（ boolean enabled） public boolean isEnabled（）Dpublic boolean setEnabled（ boolean enabled） public boolean getEnabled（）
单选题下列代码的编译或执行结果是（ ）。public class MyVal{ public static void main(String args[]){ MyVal m = new MyVal(); m.aMethod(); } public void aMethod(){ boolean b[] = new Boolean[5]; System.out.println(b[0]); }}A1BnullC0D编译错误
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多选题A JavaBeans component has the following field： 11. private boolean enabled； Which two pairs of method declarations follow the JavaBeans standard for accessing this field？（）AABBCCDD
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单选题public class test （ private static int j = 0； private static boolean methodB（int k） （ j += k； return true； ） public static void methodA（int i）（ boolean b： b = i 10 | methodB （4）； b = i 10 || methodB （8）； ） public static void main （String args[]）（ methodA （0）； system.out.printIn（j）； ） ） What is the result？（）A The program prints “0”B The program prints “4”C The program prints “8”D The program prints “12”E The code does not complete.