程序師世界是廣大編程愛好者互助、分享、學習的平台,程序師世界有你更精彩!
首頁
編程語言
C語言|JAVA編程
Python編程
網頁編程
ASP編程|PHP編程
JSP編程
數據庫知識
MYSQL數據庫|SqlServer數據庫
Oracle數據庫|DB2數據庫
 程式師世界 >> 編程語言 >> JAVA編程 >> JAVA編程入門知識 >> Test of the Java Skill(1)

Test of the Java Skill(1)

編輯:JAVA編程入門知識


      Question 1:
      What will happen when you attempt to compile and run this code?
      class Base{
      public final void amethod(){
      System.out.println(“amethod”);
      }
      }
  
      public class Fin extends Base{
      public static void main(String argv[]){
      Base b = new Base();
      b.amethod();
      }
      }
  
      A. Compile time error indicating that a class with any final methods must be declared final itself
  
      B. Compile time error indicating that you cannot inherit from a class with final methods
  
      C. Run time error indicating that Base is not defined as final
  
      D. SUCcess in compilation and output of “amethod” at run time
  
      Question 2:
      Given the following code what will be output?
  
      public class Pass{
      static int j = 20;
      public static void main(String argv[]){
      int i=10;
      Pass p = new Pass();

   p.amethod(i);
      System.out.println(i);
      System.out.println(j);
      }
  
      public void amethod(int x){
      x=x*2;
      j=j*2;
      }
      }
  
      A. Error: amethod parameter does not match variable
  
      B. 20 and 40
  
      C. 10 and 40
  
      D. 10 and 20
  
      Question 3:
      What happens when you attempt to compile and run these two files in the same Directory?
  
      // File P1.Java
  
      package MyPackage;
      class P1{
      void afancymethod(){
      System.out.println(“what a fancy method”);
      }
      }
  
      // File P2.java
  
      public class P2 extends P1{
      afancymethod();
      }
  
      A. Both compile and P2 outputs “what a fancy method” when run
  
      B. Neither will compile
  
      C. Both compile but P2 has an error at run time
  
      D. P1 compiles cleanly but P2 has an error at compile time
  
      Question 4:
      Which statement declares a variable a which is suitable for
   referring to an array of 50 string objects?
  
      A. char a[][];
  
      B. String a[];
  
      C. String []a;
  
      D. Object a[50];
  
      E. String a[50];
  
      Question 5:
      Given the following declaration
      String s = "Example";
      Which are legal code?
  
      A. s >>> = 3;
  
 

  1. 上一頁:
  2. 下一頁:
Copyright © 程式師世界 All Rights Reserved