举一反三
- 以下程序运行的结果是class Aclass{ public void go( ){ System.out.println("Aclass"); } } public class Bclass extends Aclass{ public void go( ){ System.out.println("Bclass"); } public static void main(String args[]){ Aclass a=new Bclass(); a.go(); } } A: Aclass B: Bclass C: Class Cast Exception D: 语法错误
- 看下面一段程序: class Aclass{ void go(){ System.out.println("Aclass");} } public class Bclass extends Aclass{ void go{ System.out.println("Bclass"); } public static void main(String args[]){ Aclass a=new Aclass(); Aclass a1=new Bclass(); a.go(); a1.go(); } 以上程序运行结果是:(). A: Aclass <br/>Aclass B: Aclass <br/>Bclass C: Bclass <br/>Aclass D: Bclass <br/>Bclass
- 下列程序的输出结果为 (注意:必需和程序运行结果严格一致,包括大小写、空格和换行!)class Aclass { void go() { System.out.println("Aclass"); } } public class Bclass extends Aclass { void go() { System.out.println("Bclass"); } public static void main(String args[]){ Aclass a=new Aclass(); Aclass a1=new Bclass(); a.go(); a1.go(); } }
- 看下面一段程序: class Aclass{ void go() { System.out.println("Aclass"); }}public class Bclass extends Aclass{ void go() { System.out.println("Bclass"); } public static void main(String args[]){ Aclass a=new Aclass(); Aclass a1=new Bclass(); a.go(); a1.go(); }}以上程序运行结果是:( ) A: AclassAclass B: BclassBclass C: AclassBclass D: BclassAclass
- 以下程序运行的结果是class Aclass{ public void go( ){ System.out.println("Aclass"); } } public class Bclass extends Aclass{ public void go( ){ System.out.println("Bclass"); } public static void main(String args[]){ Aclass a=new Bclass(); a.go(); } } A: Aclass B: Bclass C: Class Cast Exception D: 语法错误
内容
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现有两个类AClass、BClass,以下描述中表示BClass继承自AClass的是( )。 A: class AClass extends BClass B: class BClass implements AClass C: class AClass implements BClass D: class BClass extends AClass
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已定义类Aclass:class Aclass {private int x = 1;protected int y = 2;public int z = 3;public int sumA(){ return(x +y +z ); }}再通过继承与扩展定义子类Bclass:class Bclass extends Aclass {private A: s += b; B: s += x; C: s += z; D: s += y;
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中国大学MOOC: 下列代码中构造方法的返回类型是()public class Village { Village () { System .out .println(“hiding in Village”) ; } public static void main( String args [ ]) { Village c =new Village ( ) ;}class Village { public static void main( String args [ ]) { Village c =new Village ( ) ; } Village () { System .out .println(“hiding in Village”) ; } }
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中国大学MOOC: 现有两个类AClass、BClass,以下描述中表示BClass继承自AClass的是( )。
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public class Example { public static void main(String[] args) { new Father () { public void show() { System.out.println("helloworld"); } }.show(); } } class Father { public void show() { System.out.println("hellofather"); } }