假设A类有如下定义,设a是A类的一个实例,下列语句调用哪个是错误的? class A{ int i; static String s; void method1() { } static void method2() { } }A.System.out.println(a.i);B.a.method1();C.A.method1();D.A.method2()

假设A类有如下定义,设a是A类的一个实例,下列语句调用哪个是错误的? class A{ int i; static String s; void method1() { } static void method2() { } }

A.System.out.println(a.i);

B.a.method1();

C.A.method1();

D.A.method2()


参考答案和解析
A.method1();

相关考题:

阅读下列代码段,选出该代码段的正确文件名( )。 class A { void method1() { System.out.println("method1 in class A"); } } public class B { void method2() { System.out.println("method2 in class B"); } public static void main(String args[]) { System.out.println("main in class B"); } }A.A.javaB.A.classC.B.classD.B.java

下列程序打包到example包,main方法调用线程类输出0~9这10个数,请填写横线处的内容。注意:请勿改动main()主方法和其他已有语句内容,仅在横线处填入适当语句。______interface MyInterface{public abstract void print(int n);}class Mythread extends Thread ______ MyInterface{public void run(){for(int i = 0; i < 10; i++)this.print(i);}public void print(int n){System.out.print(n +" ");}}public class Example1_6{public static void main(String argv[]){Mythread th = new Mythread();______}}

下列程序段运行的结果为 public class Test{ static void print(String s,int i){ System.out.println("String:"+s+",int:"+i); } static void print(int i,String s){ System.out.println("int:"+i+",String:"+s); } public static void main(String[]args){ print(99,"Int first"); } }A.String:String first,int:11B.int:11,String:Int firstC.String:String first,int99D.int:99,String:Int first

给出下面的接口: interface A{ int method1(int i); int method2(int j); } 下面那个类实现了这个接口,并且不是抽象的?() A.class B implements A{ int method1(){} int method2(){} }B.class B { int method1(int i){} int method2(int j){} }C.class B implements A{ int method1(int i){} int method2(int j){} }D.class B extends A{ int method1(int i){} int method2(int j){} }

若有如下程序:includeusing namespaces std;int s=0;class sample{ static int n;pub 若有如下程序: #include<iostream> using namespaces std; int s=0; class sample { static int n; public: sample(int i) { n=i; } static void add() { s+=n; } ); int sample::s=0; int main() { sample a(2),b(5); sample::add(); cout<<s<<endl; return 0; } 程序运行后的输出结果是A.2B.5C.7D.3

接口A的定义如下,指出下列哪些类实现了该接口______。 Interface A { Int method1 (int i); Int method2 (int j); }A.class B implements A { Int method1(){} Int method2(){} }B.class B extends A { Int method1(int i){} Int method2(int j){} }C.class B { Int method1(int i){} Int method2(int j){} }D.class B implements A { Int method1(int i){} Int method2(int j){} }

已知有下列类的说明,则下列哪个语句是正确的?public class Test { private float f=1.0f; int m=12; static int n=1; public static void main(String arg[]) { Test t= new Test(); }}A.t.f;B.this. nC.Test.m;D.Test.f;

下面程序段的输出结果是 class Base { int i; Base() { add(1); } void add(int v) { i+=v; } void print() { System.out.println(i); } } class Extension extends Base { Extension() { add(2); } void add(int v) { i+=v*2; } } public class Test { public static void main(String args[]) { bogo(new Extension()); } static void bogo(Baseb){ b.add(8); b.print(); } }A.9B.18C.20D.22

下列程序段运行的结果为 public class Test{ static void print(String s,int i){ System.out.println("String:"+s+",int:"+i); } static void print(int i, String s){ System.out.println("int:"+i+",String:"+s); } public static void main(String [] args){ print(99,"Int first"); } }A.String:Stringfirst,int:11B.int:11,String:Int firstC.String:String first,int:99D.int:99,String:int first

阅读下列代码段,选出该代码段的正确的文件名( )。 class A { void method () { System.out.println ("methodl in class A"); } } public class B { void method2 () { System.out.println("method2 in class B"); } public static void main (String args[]) { System.out.println ("main () in class B"); } }A.A.javaB.A.classC.B.classD.B.java

若有如下程序:includeusing namespace std;int s=O;class sample{static int n;publi 若有如下程序: #include<iostream> using namespace std; int s=O; class sample { static int n; public: sample(int i) { n=i; } static void add() { s+=n; } }; int sample::s=0; int main() { sample a(2),b(5); sample::add(); cout<<S<<end1; return 0; } 程序运行后的输出结果是A.2B.5C.7D.3

有如下程序: public class Sun { public static void main(String args[ ]) { int s=0; int i=1; while(i<=100) { s=s+i; } System.out.println(s); } } 运行后的结果是( )。A.5050B.5051C.死循环,直到溢出D.无穷大的数

4 . 写出程序的输出结果class Class1 {private string str = "Class1.str";private int i = 0;static void StringConvert(string str) {str = "string being converted.";}static void StringConvert(Class1 c) {c.str = "string being converted.";}static void Add(int i) {i++;}static void AddWithRef(ref int i) {i++;}static void Main() {int i1 = 10;int i2 = 20;string str = "str";Class1 c = new Class1();Add(i1);AddWithRef(ref i2);Add(c.i);StringConvert(str);StringConvert(c);Console.WriteLine(i1);Console.WriteLine(i2);Console.WriteLine(c.i);Console.WriteLine(str);Console.WriteLine(c.str);}}

有如下程序:include using namespace std;int s=0;class sample { static int n;publ 有如下程序: #include <iostream> using namespace std; int s=0; class sample { static int n; public: sample(int i) { n=i; } static void add() { s+=n; } };A.2B.5C.7D.3

有一个接口定义如下,下列选项中实现了该接口并且不是抽象的是 interface A { int method1 (int i); int method2 (int j); }A.class B implements A { int method1(){} int method2(){} }B.class B { int method1(int i){} int method2(int j){} }C.class B implements A { int method1(int 1){} int method2(int j){} }D.class B extends A { int method1(int i){} int method2(int j){} }

有一个接口定义如下,下列选项中实现了该接口并且不是抽象的是 interface A { int method1(int i); int method2(int j); }A.class B implements A { int method1(){} int method2(){} }B.class B { int method1(int i){} int method2(int j){} }C.class B implements A { int method1(int i){} int method2(int j){} }D.class B extends A { int method1(int i){} int method2(int j){} }

若有如下程序:includeusing namespace std;int s=0;class sample{static int n;pubic 若有如下程序: #include<iostream> using namespace std; int s=0; class sample { static int n; pubic: sample(int i) { n=i; } static void add() { S+=n; } }; int sample::n=O; int main() { sample a(2),b(5); sample::add(); cout<<s<<endl; return 0; } 程序运行后的输出结果是( )。A.2B.5C.7D.3

有如下类的定义,横线处的语句是( )。 class TestClass { ______ int x,y; public: TestClass(int a=0,int b=0) { X=a: y=b; } static void change() { y-=10; y-=10; } };A.publicB. privateC.staticD.protected

若有如下程序:include using namespaces std;int s=0;class sample {static iht n;pu 若有如下程序: #include <iostream> using namespaces std; int s=0; class sample { static iht n; public: sample(int i) { n=i; } static void add() { s+=n; } }; int sample::s=0; int main() { sample a(2),b(5); sample::add(); cout<<s<<endl; return 0; } 程序运行后的输出结果是A.2B.5C.7D.3

3下列程序段运行的结果为( )。 public class Test{ static void print(String s,int i){ System.out.pdntlnC String: "+s+",int:"+i); } static void print(iht i,String s){ System.out.prinflnCint:"+i+",gtring:"+s); } public static void main(String[] args){ print(99,"Int first"); } }A.String:String first,int: 11B.int: 11,String:Int firstC.String:String first,int:99D. int:99,Stfing:Int first

以下程序的调试结果为?public class Outer{public String name = "Outer";public static void main(String argv[]){Inner i = new Inner();i.showName();}private class Inner{String name =new String("Inner");void showName(){System.out.println(name);}}}A.输出结果 OuterB.输出结果 InnerC.编译错误,因Inner类定义为私有访问D.在创建Inner类实例的行出现编译错误

设有类定义如下:class Base{public Base(int i){}}public class MyOver extends Base{public static void main(String arg[]){MyOver m = new MyOver(10);}MyOver(int i){super(i);}MyOver(String s, int i){this(i);//Here}}以下哪条语句可以安排在//Here处 ?A.MyOver m = new MyOver();B.super();C.this("Hello",10);D.Base b = new Base(10);

以下的程序的调试结果为public class Scope{int i;public static void main(String argv[]){Scope s = new Scope();s.amethod();}public static void amethod(){System.out.println(i);}} A. 输出结果为:0B. 无输出C. 编译错误D. 输出null

设有如下代码:class Base{}public class MyCast extends Base{static boolean b1=false;static int i = -1;static double d = 10.1;public static void main(String argv[]){MyCast m = new MyCast();Base b = new Base();//Here}}则在 //Here处插入哪个代码将不出现编译和运行错误。A.b=m;B.m=b;C.d =i;D.b1 =i;

对于下列代码: 1) class Person {   2} public void printValue(int i, int j) {//... }     3} public void printValue(int i){//... }    4} }   5) public class Teacher extends Person { 6} public void printValue( ) {//... }     7} public void printValue(int i) {//...}     8} public static void main(String args[]){     9} Person t = new Teacher( );     10} t.printValue(10);     11} } 第10行语句将调用哪行语句?()A、 line 2B、 line 3C、 line 6D、 line 7

public class Test {  public static void leftshift(int i, int j) {  i=j;  }  public static void main(String args[])  {  int i = 4, j = 2;  leftshift(i, j);   System.out.printIn(i); }  }     What is the result?()  A、 2B、 4C、 8D、 16E、 The code will not compile.

单选题public class Parent{     public void change(int x){} }  public class Child extends Parent{     //覆盖父类change方法  }  下列哪个声明是正确的覆盖了父类的change方法?()A protected void change(int x){}B public void change(int x, int y){}C public void change(String s){}D public void change(int x){}

单选题对于下列代码: 1) class Person {   2} public void printValue(int i, int j) {//... }     3} public void printValue(int i){//... }    4} }   5) public class Teacher extends Person { 6} public void printValue( ) {//... }     7} public void printValue(int i) {//...}     8} public static void main(String args[]){     9} Person t = new Teacher( );     10} t.printValue(10);     11} } 第10行语句将调用哪行语句?()A line 2B line 3C line 6D line 7