现有: class Wrench f public static void main(String [] args) { Wrench w=new Wrench(); Wrench w2=new Wrench(); w2=go (w, w2); System.out.print (w2==w); } static Wrench go (Wrench wrl, Wrench wr2) { Wrench wr3=wrl; wrl=wr2; wr2=wr3; return wr3; } 结果是什么?() A、 falseB、 trueC、编译失败D、运行的时候有异常抛出
现有: class Wrench f public static void main(String [] args) { Wrench w=new Wrench(); Wrench w2=new Wrench(); w2=go (w, w2); System.out.print (w2==w); } static Wrench go (Wrench wrl, Wrench wr2) { Wrench wr3=wrl; wrl=wr2; wr2=wr3; return wr3; } 结果是什么?()
- A、 false
- B、 true
- C、编译失败
- D、运行的时候有异常抛出
相关考题:
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对于下面( )类定义,可以通过“newJ_Class()”生成类J_Class的实例对象。A、publicclassJ_Class{publicJ_Class(void){}}B、publicclassJ_Class{}C、publicclassJ_Class{publicJ_Class(Strings){}}D、publicclassJ_Class{publicvoidJ_Class(){}publicJ_Class(Strings){}
现有包结构: com |-- x | |-- Alpha.class | | | |-- y | |-- Beta.class | |-- Gamma.class 和类: //insert code here import com.*; import com.x.y.*; class Test { Alpha a; Beta b; Gamma c; } 哪两行分别插入后可允许代码编译?() A、package com.;B、import com.x;C、package com.x;D、import com.x.Alpha;
现有: interface I { void go(); } abstract class A implements I { } class C extends A { void go(){ } } 结果是什么?() 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
现有如下包结构: com |-- x | |-- Alpha.class | | | |-- y | |-- Beta.class | |-- Gamma.class 和类: class Test { Alpha a; Beta b; Gamma c; } 哪三个必须加入到类 Test 中,以使其通过编译?()A、package y;B、package com;C、import com.x.*;D、import com.x.y.*
现有: class Dog{ } class Harrier extends Dog { } class DogTest{ public static void main (String [] args) { Dog dl=new Dog(); Harrier hl=new Harrier(); Dog d2=hl; Harrier h2= (Harrier) d2; Harrier h3=d2; } } 下面哪一项是正确的?() A、2个Dog对象被创建B、2个Harrier对象被创建C、3个Harrier对象被创建D、编译失败
现有: class TestApp{ public static void main (String[] args){ for (int i=0; iA、0123B、012456789C、0123456789D、012
Which of the following class addresses is reserved for multicast?()A、 Class AB、 Class BC、 Class CD、 Class D
现有: 1 Interface F{} 2 class A implements F{} 3 class B extends A{} 4 class C extends B{ 5 public static void main(String[] args){ 6 B b=new B(); 7 //inSert C0de here 8 } 9 } 下列哪行代码插入到第7行,将抛出java.lang.ClassCaseException异常()A、 A a=b;B、 F f= (C)b;C、 F f= (A)b;D、 B bb= (B)(A)b;
现有: class A {public String name="a"} class B extends A {public String name="b"} 执行如下代码后的结果是哪项?() A a=new B(); System.out.println(a.name); A、 aB、 bC、编译失败D、运行时抛出异常
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现有: class TestA { public void start() { System.out.println("TestA"); } } public class TestB extends TestA { public void start() { System.out.println("TestB"); } public static void main (string[] args) ( ((TestA)new TestB()).start(); ) } 运行结果是哪项?() A、 TeStAB、 TeStBC、编译失败D、运行时抛出异常
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单选题现有: 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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单选题现有: class TestA { public void start() { System.out.println("TestA"); } } public class TestB extends TestA { public void start() { System.out.println("TestB"); } public static void main (string[] args) ( ((TestA)new TestB()).start(); ) } 运行结果是哪项?()A TeStAB TeStBC编译失败D运行时抛出异常
多选题现有: public class TestDemo{ private int X-2; static int y=3; public void method(){ final int i=100; int j =10; class Cinner { public void mymethod(){ //Here } } } } 在Here处可以访问的变量是哪些?()AXByCjDi
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。
单选题现有: 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:()A1B2C3D4
单选题现有: class TestApp{ public static void main (String[] args){ for (int i=0; iA0123B012456789C0123456789D012