单选题package test;  class Target {  public String name = “hello”;  }  What can directly access and change the value of the variable name?()Aany classBonly the Target classCany class in the test packageDany class that extends Target

题目
单选题
package test;  class Target {  public String name = “hello”;  }  What can directly access and change the value of the variable name?()
A

 any class

B

 only the Target class

C

 any class in the test package

D

 any class that extends Target


相似考题
更多“package test;  class Target {  public String name = “hello”;”相关问题
  • 第1题:

    使下列程序正常运行并且输出“Hello!”,横线处应填写的内容是( )。 class Test { public static void main(string[]args){ Test t=new Test; start; } Public void run{ System.out.println("Hello!¨); )

    A.extends Thread

    B.extends Float

    C.extends Iostream

    D.extends Stdio


    正确答案:A
    A。【解析】从后面重写了run方法来看,这是通过继承Thread类,并重写run方法定义线程体,然后创建该子类的对象的方式来创建线程。

  • 第2题:

    下列哪个选项的java源文件程序段是不正确的? ( )

    A.package testpackage; public class Test{ }

    B.import java.io.*; package testpackage; public class Test{ }

    C.import java.i.*; class Person{} public class Test{ }

    D.import java.io.*; import java.awt.*; public class Test { }


    正确答案:B

  • 第3题:

    下列程序的输出结果是( )。 public class Test { public static void main (String[] args) { String s="hello"; s.replace ('r','m'); System.out.println(s); } }

    A.hello

    B.HELLO

    C.hemmo

    D.HEMMO


    正确答案:A
    解析:String类的replace (char oldChar,char newChar)函数的作用是返回一个新的字符串,它是通过用newChar替换此字符串中出现的所有oldChar而生成的。返回的是新字符串,但是原字符串变量的值并未发生改变。因此,输出的是“hello”而不是“hemmo”。如果替换语句换为: s=s.replace('l','m');,则输出“hemmo”。

  • 第4题:

    执行以下代码会输出什么结果?()   public class Test {    StringgetStr(String s){  return s + “hello”;  }  public static void main(String arg[]) {           Test t= new Test();  System.out.println(t.getStr(“LiLei/n”));     } } 

    • A、 编译报错
    • B、 LiLei    hello
    • C、 LiLeihello
    • D、 无任何输出

    正确答案:B

  • 第5题:

    class A {  public A() {  System.out.println(“hello from a”);  }  }  class B extends A {  public B () {  System.out.println(“hello from b”);  super();  }  }  public class Test {  public static void main(String args[]) {  A a = new B();  }  }   What is the result when main is executed?()  

    • A、 Compilation fails.
    • B、 hello from a
    • C、 hello from b
    • D、 hello from b hello from a
    • E、 hello from a hello from b

    正确答案:A

  • 第6题:

    public class Employee{   private String name;   public Employee(String name){   this.name = name;  }   public void display(){   System.out.print(name);  }  }   public class Manager extends Employee{   private String department;   public Manager(String name,String department){   super(name);   this.department = department;  }   public void display(){   System.out.println( super.display()+”,”+department);  }   }   执行语句new Manager(“smith”,”SALES”)后程序的输出是哪项?() 

    • A、 smith,SALES
    • B、 null,SALES
    • C、 smith,null
    • D、 null,null

    正确答案:A

  • 第7题:

    单选题
    public class Employee{       private String name;  public Employee(String name){           this.name = name;      }  public String getName(){         return name;      } }  public class Manager extends Employee{       private String department;  public Manager(String name,String department){          this.department = department;          super(name);  System.out.println(getName());      }  }  执行语句new Manager(“smith”,”SALES”)后程序的输出是哪项?()
    A

     smith

    B

     null

    C

     SALES

    D

     编译错误


    正确答案: C
    解析: 暂无解析

  • 第8题:

    单选题
    Given: 1.package test; 2. 3.class Target { 4.public String name = "hello";5.} What can directly access and change the value of the variable name?()
    A

    any class

    B

    only the Target class

    C

    any class in the test package

    D

    any class that extends Target


    正确答案: A
    解析: 暂无解析

  • 第9题:

    单选题
    Given: 1.package test; 2. 3.class Target { 4.public String name = "hello";5.} What can directly access and change the value of the variable name?()
    A

    any class

    B

    only the Target class

    C

    any class in the test package

    D

    any class that extends Target


    正确答案: D
    解析: 暂无解析

  • 第10题:

    单选题
    package test; class Target{ public String name="hello"; } What can directly access and change the value of the variable name?()
    A

    any class

    B

    only the Target class

    C

    any class in the test package

    D

    any class that extends Target


    正确答案: C
    解析: 暂无解析

  • 第11题:

    单选题
    执行以下代码会输出什么结果?()   public class Test {    StringgetStr(String s){  return s + “hello”;  }  public static void main(String arg[]) {           Test t= new Test();  System.out.println(t.getStr(“LiLei/n”));     } }
    A

     编译报错

    B

     LiLei    hello

    C

     LiLeihello

    D

     无任何输出


    正确答案: B
    解析: 暂无解析

  • 第12题:

    单选题
    public class Employee{   private String name;   public Employee(String name){   this.name = name;  }   public void display(){   System.out.print(name);  }  }   public class Manager extends Employee{   private String department;   public Manager(String name,String department){   super(name);   this.department = department;  }   public void display(){   System.out.println( super.display()+”,”+department);  }   }   执行语句new Manager(“smith”,”SALES”)后程序的输出是哪项?()
    A

     smith,SALES

    B

     null,SALES

    C

     smith,null

    D

     null,null


    正确答案: D
    解析: 暂无解析

  • 第13题:

    在下画线处填入代码,使程序正常运行并且输出“Hello!”。

    class Test ______ {

    public staric void maim (string[] args) {

    Test t=new Test();

    t.start();

    }

    public void run() {

    System.out.println("Hello!");

    }

    }


    正确答案:extends Thread
    extends Thread 解析:创建线程有两种方法:实现java.lang.Runnable接口和继承Thread类并重写run()方法。从创建线程实例的语句Test t=new Test();可以看出本程序通过继承Thread类来创建进程,因此答案为extends Thread。

  • 第14题:

    下列程序段的输出是( )。 public class Test { public static void main (String args[ ]) { String ss1 = new String("hello"); String ss2 = new String("hello"); System.out.println(ssl == ss2); System.out.println (ssequals(ss2)); } }

    A.true, false

    B.true, true

    C.false, true

    D.false, false


  • 第15题:

    以下代码的输出结果?public class Test{public static void main(String argv[]){String x="hello";change(x);System.out.println(x);}static void change(String m){m=m+2;}}

    A. hello

    B. hello2

    C. 编译报错

    D. 运行报错,不能将串与整数相加


    正确答案:A

  • 第16题:

    package test1;  public class Test1 {  static int x = 42;  }  package test2;  public class Test2 extends test1.Test1 {  public static void main(String[] args) { System.out.println(“x = “ + x);  }  }  What is the result?() 

    • A、 x = 0
    • B、 x = 42
    • C、 Compilation fails because of an error in line 2 of class Test2.
    • D、 Compilation fails because of an error in line 3 of class Test1.
    • E、 Compilation fails because of an error in line 4 of class Test2.

    正确答案:C

  • 第17题:

    public class Employee{       private String name;  public Employee(String name){           this.name = name;      }  public String getName(){         return name;      } }  public class Manager extends Employee{       public Manager(String name){          System.out.println(getName());      } }  执行语句new Manager(“smith”)后程序的输出是哪项?() 

    • A、 smith
    • B、 null
    • C、 编译错误
    • D、 name

    正确答案:C

  • 第18题:

    public class Plant {  private String name;  public Plant(String name) { this.name = name; }  public String getName() { return name; }  }  public class Tree extends Plant {  public void growFruit() { }  public void dropLeaves() { }  }  Which is true?() 

    • A、 The code will compile without changes.
    • B、 The code will compile if public Tree() { Plant(); } is added to the Tree class.
    • C、 The code will compile if public Plant() { Tree(); } is added to the Plant class.
    • D、 The code will compile if public Plant() { this(”fern”); } is added to the Plant class.
    • E、 The code will compile if public Plant() { Plant(”fern”); } is added to the Plant class.

    正确答案:D

  • 第19题:

    单选题
    class A {  public A() {  System.out.println(“hello from a”);  }  }  class B extends A {  public B () {  System.out.println(“hello from b”);  super();  }  }  public class Test {  public static void main(String args[]) {  A a = new B();  }  }   What is the result when main is executed?()
    A

     Compilation fails.

    B

     hello from a

    C

     hello from b

    D

     hello from b hello from a

    E

     hello from a hello from b


    正确答案: B
    解析: Call to super must be first statement in constructor. 

  • 第20题:

    单选题
    public class Employee{   private String name;   public Employee(String name){   this.name = name;  }   public String getName(){   return name;  }  }   public class Manager extends Employee{   public Manager(String name){   System.out.println(getName());  }  }   执行语句new Manager(“smith”)后程序的输出是哪项?()
    A

     smith

    B

     null

    C

     编译错误

    D

     name


    正确答案: D
    解析: 暂无解析

  • 第21题:

    单选题
    package test1;  public class Test1 {  static int x = 42;  }  package test2;  public class Test2 extends test1.Test1 {  public static void main(String[] args) { System.out.println(“x = “ + x);  }  }  What is the result?()
    A

     x = 0

    B

     x = 42

    C

     Compilation fails because of an error in line 2 of class Test2.

    D

     Compilation fails because of an error in line 3 of class Test1.

    E

     Compilation fails because of an error in line 4 of class Test2.


    正确答案: E
    解析: 暂无解析

  • 第22题:

    单选题
    public class Plant {  private String name;  public Plant(String name) { this.name = name; }  public String getName() { return name; }  }  public class Tree extends Plant {  public void growFruit() { }  public void dropLeaves() { }  }  Which is true?()
    A

     The code will compile without changes.

    B

     The code will compile if public Tree() { Plant(); } is added to the Tree class.

    C

     The code will compile if public Plant() { Tree(); } is added to the Plant class.

    D

     The code will compile if public Plant() { this(”fern”); } is added to the Plant class.

    E

     The code will compile if public Plant() { Plant(”fern”); } is added to the Plant class.


    正确答案: A
    解析: 暂无解析

  • 第23题:

    单选题
    package test;  class Target {  public String name = “hello”;  }  What can directly access and change the value of the variable name?()
    A

     any class

    B

     only the Target class

    C

     any class in the test package

    D

     any class that extends Target


    正确答案: C
    解析: 暂无解析

  • 第24题:

    单选题
    public class Employee{   private String name;   public Employee(String name){   this.name = name;  }   public String getName(){   return name;  }  }   public class Manager extends Employee{   private String department;   public Manager(String name,String department){   this.department = department;   super(name); (应于上一行掉位置)   System.out.println(getName());  }  }   Super的位置是否在方法的首行   执行语句new Manager(“smith”,”SALES”)后程序的输出是哪项?()
    A

     smith

    B

     null

    C

     SALES

    D

     编译错误


    正确答案: C
    解析: 暂无解析