A class games.cards.Poker is correctly defined in the jar file Poker.jar. A user wants to execute the main method of Poker on a UNIX system using the command：java games.cards. Poker What allows the user to do this？（）

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.

A . approved by the CCS B . designed for float free，automatic activation C . operated on 121.5/243 MHz D . operated manually

A . The JAR fileis located at$JAVA_HOME/jre/classes/myLib.jar. B . The JAR fileis located at$JAVA_HOME/jre/lib/ext/myLib.jar. C . TheJ AR fileis located at/foo/myLib.jar and aclasspath environment variable is set that includes /foo/myLib.jar/Paper.class. D . The JAR fileis located at/foo/myLib.jar and a classpath environment variable is set that includes/foo/myLib.jar. E . The JAR file is located at/foo/myLib.jar and the Book class is compiled using javac-cp/foo/myLib.jar/Paper Book.java. F . The JAR file is located at/foo/myLib.jar and the Book class is compiled using javac-classpath/foo/myLib.jar Book.java.

A . operates on both military and civilian aircraft distress frequencies B . transmits both an alerting signal and a homing signal C . must be the float free type and automatically activated D . operates with a greater output of signal power

A .  There are no instanced of A that will become eligible for garbage collection. B .  Explicitly setting myA to null marks that instance to be eligible for garbage collection. C .  Any call on tryIt（） causes the private instance of A to be marked for garbage collection. D .  Private instances of A become eligible for garbage collection when instances of Alpha become eligible for garbage collection.

A . submarine EPIRB B . safety EPIRB C . ship EPIRB D . survival craft EPIRB

A . The JAR file is located at $JAVA_HOME/jre/classes/myLib.jar. B . The JAR file is located at $JAVA_HOME/jre/lib/ext/myLib.jar.. C . The JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar/Paper.class. D . The JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar. E . The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac - cp /foo/myLib.jar/Paper Book.java. F . The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac - classpath /foo/myLib.jar Book.java

A .   a B .   b C . 编译失败 D . 运行时抛出异常

A .  Class B’s constructor is public. B .  Class B’s constructor has no arguments. C .  Class B’s constructor includes a call to this（）. D .  Class B’s constructor includes a call to super（）.

A . 代码通过编译 B . 由于第1行的错误导致编译失败 C . 由于笫3行的错误导致编译失败 D . 由于第6行的错误导致编译失败

A . The JAR file is located at $JAVA_HOME/jre/classes/myLib.jar. B . The JAR file is located at $JAVA_HOME/jre/lib/ext/myLib.jar.. C . The JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar/Paper.class. D . The JAR file is located at /foo/myLib.jar and a classpath environment variable is set that includes /foo/myLib.jar. E . The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac -cp /foo/myLib.jar/Paper Book.java. F . The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac -d /foo/myLib.jar Book.java G . The JAR file is located at /foo/myLib.jar and the Book class is compiled using javac -classpath /foo/myLib.jar Book.java

A .  public int method1（int a， int b） { return 0； } B .  private int method1（int a， int b） { return 0； } C .  private int method1（int a， long b） { return 0； } D .  public short method1（int a， int b） { return 0： } E .  static protected int method1（int a， int b） { return 0； }

A .  put Poker.jar in directory /stuff/java， and set the CLASSPATH to include /stuff/java B .  put Poker.jar in directory /stuff/java， and set the CLASSPATH to include /stuff/java/*.jar C .  Put Poker.jar in directory /stuff/java， and set the CLASSPATH to include /stuff/java/Poker.jar D .  put Poker.jar in directory /stuff/java/games/cards， and set the CLASSPATH to include /stuff/java E .  put Poker.jar in directory /stuff/java/games/cards， and set the CLASSPATH to include /stuffijava/*.jar F .  put Poker.jar in directory /stuff/java/games/cards， and set the CLASSPATH to include /stuff/java/Poker.jar

A．CLASS A CLASS B B．CLASS A CLASS B CLASS B C．CLASS A ClASS B D．CLASS A CLASS B CLASS A CLASS B CLASS B CLASS B

若类A和类B的定义如下； class A { int i，j； public： int geti() { return i； } }； clasS B：public A { int k； public： void make() { k=i*j； } }； 则上述定义中非法的表达式是()。 A．k=i*j B．int k； C．return i； D．void make()

对于类定义： class A{ public: virtual void func1(){} void func2(){} }; class B:public A{ public: void func1(){cout＜＜"class B func 1"＜＜end1;} virtual void func2(){cout＜＜"class B func 2"＜＜end1;} }; 下面叙述正确的是(53)。 A．A∷func2()和B∷func1()都是虚函数 B．A∷func2()和B∷func1()都不是虚函数 C．B∷func1()是虚函数，而A∷func2()不是虚函数 D．B∷func1()不是虚函数，而A∷func2()是虚函数

若类A和类B的定义如下： class A { int i， public： void get()； / /．．． }； class B：A//默认为私有派生 { int k； public： void make()； / /．．． }; void B： ：make() { k=i*j； } 则上述定义中， ()是非法的表达式。 A．void get()； B．int k： C．void make()； D．k=i*j；

请写出代码的运行结果。 class A{ int f(int x,int y){ return x+y； } } class B extends A{ int f(int x,int y){ int m = super.f(x，y)+10; return m； } } public class E{ public static void main(String args[]){ A a = new B()； System.out.println(a.f(2，0))； } }

A．java A B．java B C．java C D．javA．class