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class Guy { String greet() { return "hi "; } } class Cowboy extends Guy { String greet() { return "howdy "; } } class Wrangler extends Cowboy { String greet() { return "ouch! "; } } class Greetings2 { public static void main(String [] args) { Guy g = new Wrangler(); Guy g2 = new Cowboy(); Wrangler w2 = new Wrangler(); System.out.print(g.greet()+g2.greet()+w2.greet()); } } 结果是什么?()
- A、hi hi ouch!
- B、hi howdy ouch!
- C、ouch! howdy ouch!
- D、编译失败
参考答案
更多 “ class Guy { String greet() { return "hi "; } } class Cowboy extends Guy { String greet() { return "howdy "; } } class Wrangler extends Cowboy { String greet() { return "ouch! "; } } class Greetings2 { public static void main(String [] args) { Guy g = new Wrangler(); Guy g2 = new Cowboy(); Wrangler w2 = new Wrangler(); System.out.print(g.greet()+g2.greet()+w2.greet()); } } 结果是什么?() A、hi hi ouch!B、hi howdy ouch!C、ouch! howdy ouch!D、编译失败” 相关考题
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class Guy{String greet(){return “hi“}} class Cowboy extends Guy {String greet(){return“howdy”}} class Surfer extends Guy {String greet(){return“dudel”}} class Greetings{ public static void main (string[]args){ Guy[] guy= {new Guy(),new Cowboy(),new Surfer()}; for(Guy 0: guys) System.out.print(g.green()); } } 结果为: A、运行时异常被输出B、第7行出现一个错误,编译失败C、第8行出现一个错误,编译失败D、hi hi hiE、hi hawdy doude
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现有: class Guy { String greet() { return "hi"; } } class Cowboy extends Guy { String greet() { return. "howdy";}} class Wrangler extends Cowboy { String greet() { return "orch!"; } } class Greetings2 { public static void main (String [] args) { Guy g=new Wrangler(); Guy g2=new Cowboy(); Wrangler w2=new Wrangler(); System. out .print (g.greet()+g2.greet()+w2 .greet()); } } 结果是什么?() A、 hi hi ouch!B、 ouch! howdy ouch!C、 hi howdy ouch!D、编译失败E、运行的咐候有异常抛出
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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?()A、 public void aMethod() {}B、 private void aMethod() {}C、 public void aMethod(String s) {}D、 private Y aMethod() { return null; }E、 public X aMethod() { return new Y(); }
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现有: class Guy {String greet() {return "hi"; } } class Cowboy extends Guy ( String greet() ( return "howdy ¨; ) ) class Surfer extends Guy (String greet() (return "dude! ";)) class Greetings { public static void main (String [] args) { Guy [] guys = ( new Guy(), new Cowboy(), new Surfer() ); for (Guy g: guys) System.out.print (g.greet()}; } } 结果为:() A、 hi howdy dude!B、运行时异常被抛出。C、第7行出现一个错误,编译失败。D、第8行出现一个错误,编译失败。
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final class Tree { private static String tree = "tree "; String getTree() { return tree; } } class Elm extends Tree { private static String tree = "elm "; public static void main(String [] args) { new Elm().go(new Tree()); } void go(Tree t) { String s = t.getTree()+Elm.tree+tree+(new Elm().getTree()); System.out.println(s); } } 结果为:() A、elm elm elm elmB、tree elm elm elmC、tree elm tree elmD、编译失败
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class Parser extends Utils { public static void main (String [] args) { try { System.out.print(new Parser().getInt("42")); } catch (NumberFormatException n) { System.out.println("NFExc "); } } int getInt(String arg) throws NumberFormatException { return Integer.parseInt(arg); } } class Utils { int getInt(String arg) { return 42; } } 结果为:() A、42B、NFExcC、42NFExcD、编译失败
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class A { public byte getNumber() { return 1; } } class B extends A { public short getNumber() { return 2; } public static void main(String args[]) { B b = new B(); System.out.println(b.getNumber()); } } What is the result?()A、 1B、 2C、 An exception is thrown at runtime.D、 Compilation fails because of an error in line 8.E、 Compilation fails because of an error in line 14.
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1. class A { 3. public String to String() { 4. return “4”; 5. } 6. } 7. class B extends A { 8. public String toString() { 9. return super.toString() + “3”; 10. } 11. } 12. public class Test { 13. public static void main (String[] args) { 14. System.out.printIn(new B()); 15. } 16. } What is the result( )? A、 Compilation succeeds and 4 is printed.B、 Compilation …………… is printed.C、 An error on line 9 cause compilation to fail.D、 An error on line 14 cause compilation to fail.E、 Compilation succeeds but an exception is thrown at line 9.
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interface Beta {} class Alpha implements Beta { String testIt() { return “Tested”; } } public class Main1 { static Beta getIt() { return new Alpha(); } public static void main( String[] args ) { Beta b = getIt(); System.out.println( b.testIt() ); } } What is the result?() A、 TestedB、 Compilation fails.C、 The code runs with no output.D、 An exception is thrown at runtime.
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class Parser extends Utils { public static void main(String [] args) { System.out.print(new Parser().getInt("42")); } int getInt(String arg) { return Integer.parseInt(arg); } } class Utils { int getInt(String arg) throws Exception { return 42; } } 结果为:() A、42B、编译失败C、无输出结果D、运行时异常被抛出
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单选题interface Beta {} class Alpha implements Beta { String testIt() { return “Tested”; } } public class Main1 { static Beta getIt() { return new Alpha(); } public static void main( String[] args ) { Beta b = getIt(); System.out.println( b.testIt() ); } } What is the result?()A
TestedB
Compilation fails.C
The code runs with no output.D
An exception is thrown at runtime.
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单选题class Guy{String greet(){return “hi“}} class Cowboy extends Guy {String greet(){return“howdy”}} class Surfer extends Guy {String greet(){return“dudel”}} class Greetings{ public static void main (string[]args){ Guy[] guy= {new Guy(),new Cowboy(),new Surfer()}; for(Guy 0: guys) System.out.print(g.green()); } } 结果为:A
运行时异常被输出B
第7行出现一个错误,编译失败C
第8行出现一个错误,编译失败D
hi hi hiE
hi hawdy doude
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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(); }
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单选题现有: class Tree { private static String tree = "tree "; String getTree () { return tree; } } class Elm extends Tree { private static String tree = "elm "; public static void main (String [] args) { new Elm() .go (new Tree()) ; } } void go (Tree t) { String s = t.getTree () +Elm.tree + tree + (new Elm() .getTree ()) ; System.out.println (s) ;} 结果为:()A
elm elm elm elmB
tree elm elm elmC
tree elm elm treeD
tree elm tree elm
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单选题class Mineral { static String shiny() { return "1"; } } class Granite extends Mineral { public static void main(String [] args) { String s = shiny() + getShiny(); s = s + super.shiny(); System.out.println(s); } static String getShiny() { return shiny(); } } 结果为:()A
3B
12C
111D
编译失败
考题
单选题现有: class Guy {String greet() {return "hi"; } } class Cowboy extends Guy ( String greet() ( return "howdy ¨; ) ) class Surfer extends Guy (String greet() (return "dude! ";)) class Greetings { public static void main (String [] args) { Guy [] guys = ( new Guy(), new Cowboy(), new Surfer() ); for (Guy g: guys) System.out.print (g.greet()}; } } 结果为:()A
hi howdy dude!B
运行时异常被抛出。C
第7行出现一个错误,编译失败。D
第8行出现一个错误,编译失败。
考题
单选题现有 class Parser extends Utils { public static void main (String [] args) { try { System.out.print (new Parser () .getlnt ("42")) } catch (Exception e) { System.out.println ("Exc") ; } } int getlnt (String arg) throws Exception { return Integer.parselnt (arg) ; } } class Utils { int getlnt () { return 42; } } 结果是什么?()A
42ExcB
ExcC
42D
编译失败
考题
单选题class Guy { String greet() { return "hi "; } } class Cowboy extends Guy { String greet() { return "howdy "; } } class Wrangler extends Cowboy { String greet() { return "ouch! "; } } class Greetings2 { public static void main(String [] args) { Guy g = new Wrangler(); Guy g2 = new Cowboy(); Wrangler w2 = new Wrangler(); System.out.print(g.greet()+g2.greet()+w2.greet()); } } 结果是什么?()A
hi hi ouch!B
hi howdy ouch!C
ouch! howdy ouch!D
编译失败
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