Sun Certified Programmer for Java 2 Platform 1.4 (CX-310-035) Practice Questions

Q. No

Question

public class MyClass{
      int x = 10;
      static final int y= 5;

      public void method (int z){
             int a = 10;
             final float b = 10;

             class LocalClass {
                      int c = 3;

                      public void method (int d){
                             System.out.println (??);         // -- 1
            }
       }

        public static void main (String args[]){
               new MyClass();
       }
}
Which of the following variable names can be replaced ?? at line no marked as 1,without compiler error?

A , C and D

	Local classes can access all the variables from the enclosing classes. But it can access only the final variables of the enclosing method or the method parameter. The above constraint is applicable if the Local class is declared inside the non-static context. since, if the Local class is declared inside the static context it can access only the static members of the enclosing class.

public class MyClass{
       public static void main (String args[]){
             String str = "Hello World";
             System.out.print(str.indexOf('d'));
             System.out.print(str.indexOf('h'));
             System.out.print(str.indexOf('a'));
      }
}
What will be the output?

10 -1 -1

9 -1 -1

10 0 -1

10 1 -1

What is the range of values that can be stored in a short primitive variable?

0 - 656535

-32768 to 32767

-32768 to 32768

-32767 to 32768

Which of the following lines will compile without warning or error.

float f=1.3;

int i=10;

byte b=257;

char c="a";

B

	Always real values default o double. So when compiler sees a value like 1.3 , it will treat it as double and will complain. Choice C is incorrect because the byte value ranges from -128 to +127. Here also the compiler will show the same error message,' possible loss of precision'. Choice D is incorrect because , we cannot assign a String to a char, even though the length is one. ie, anything comes inside " " is a string.

What will happen if you try to compile and run the following code ?
public class MyClass {
         public static void main (String arguments[]) {
                   amethod( arguments) ;
         }
         public void amethod (String[] arguments) {
                   System.out.println (arguments) ;
                   System.out.println (arguments[1]) ;
        }
}

Error Can't make static reference to void amethod.

Error Incorrect main method.

amethod must be declared with String

Compiles and executes fine.

Which of the following will compile without error ?

import java.util.*;
package mypack;
class MyClass {}

package mypack;
import java.uril.*;
class MyClass{}

/*This is a comment */
package MyPackage;
import java.awt.*;
class MyClass{}

All of the above

Float f= new Float( 1.0F );
String str = "value is " +f;
System.out.println( str );

What will be the output of executing the above code snippet?

Compiler error invalid character in constructor

Runtime exception invalid character in constructor.

Compiles and prints 'value is 1.0'

Compiles and prints 'value is 1'

Which of the following are java keywords ?

null

const

volatile

true

What will be printed out if this code is run with the following command line : java myprog good morning
public class myprog {
             public static void main (String argv[]) {
                      System.out.println(argv[2])
            }
}

myprog

good

morning

Exception raised: java.lang.ArrayIndexOutOfBoundsException: 2

What is the range of a byte

0 - 256

-128 to 127

-127 to 128

-255 to 256


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