JAVA程序员基本测试题目
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JAVA程序员基本测试题目
第一篇：JAVA程序员基本测试题目
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 EqT est();
}
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;
} }
pile and run without error
pile 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(IOException ioe){}
} } What code would be most likely for the body of the ioCall method A.public void ioCall(){ DataInputStream din = new DataInputStream(System.in);din.readChar();}
B.public void ioCall()throw IOException{ DataInputStream din = new DataInputStream(System.in);din.readChar();}
C.public void ioCall()throws IOException{ DataInputStream din = new DataInputStream(System.in);din.readChar();}
D.public void ioCall throws IOException(){ DataInputStream din = new DataInputStream(System.in);din.readChar();
}
8.How do you force the garbage collector to run? A.Call System.gc()
B.Call Runtime.gc()
C.Either A or B
D.There is nothing you can do
9.When multiple methods exist within the same class with different method signatures, this is known as what? A.Method overloading
B.Overriding methods