JAVA程序员基本测试题目.doc

PART 1： The essential of java 1. Given the following code, what test would you need to put in place of the comment line? //place test here to result in an output of the string Equal public class EqTest{ public static void main(String argv[]){ EqTest e=new EqTest(); } EqTest(){ String s=Java; String s2=java; //place test here { System.out.println(Equal); }else { System.out.println(Not equal); } } 　} A) if(s==s2) B) if(s.equals(s2) C) if(s.equalsIgnoreCase(s2)) D) if(s.noCaseMatch(s2)) 2. Given the following code how could you invoke the Base constructor that will print out the string base constructor; class Base{ Base(int i){ System.out.println(base constructor); } 　 Base(){ } } public class Sup extends Base{ public static void main(String argv[]){ Sup s= new Sup(); //One } Sup() 　 { //Two } public void derived() { //Three } } A. On the line After //One put Base(10); 　B. On the line After //One put super(10); C. On the line After //Two put super(10); D. On the line After //Three put super(10); 3. What is the value of seasons.length for the following array? String[] seasons = {winter, spring, summer, fall, }; A. undefined B. 3 C. 4 D. 5 4. When you use the new keyword to create an object, where is it created? A. Heap B. Garbage collector 　 C. Queue D. Stack 5.What will happen if you attempt to compile and run the following code? class Base {} class Sub extends Base {} class Sub2 extends Base {} public class CEx{ public static void main(String argv[]){ Base b=new Base(); Sub s=(Sub) b; } } A. Compile and run without error B. Compile time Exception C. Runtime Exception 　 6. An overridden method can be in the same class. A. True B. False 7.Given the following code import java.io.*;public class Th{ public static void main(String argv[]){ Th t = new Th(); t.amethod(); } public void amethod(){ try{ ioCall(); }catch(IOExcep