Topics Covered by the Java Placement Exam

The Java version of the placement exam covers the following topics:

    Control structures:  if statements,  switch statement, for , while and  do . . .while loops.

Simple and multi-dimensional array

Object oriented design

    class design and use

    encapsulation

    reference and object manipulation

   static vs. instance data fields and methods

   arrays of objects

    inheritance and polymorphism

   abstract classes

Exception handling

File I/O

Interfaces

Students should also be familiar with the basic Java classes like String , Scanner , ArrayList<E> , File ,

wrapper classes ( Integer ,  Float ,  Character) and the Comparable<E> interface.

Reference: any book on Java programming and object oriented design.

Sample Questions for the Java Placement Exam

1.  Show the output of the following code:

public class Test{

public static void main ( String [] args ) {

int [] a = { 1, 2 };

swap ( a[0], a[1]);

System .out .println(a[0] + "  " + a[1] );

}

public static void swap ( int n1, int n2 ) {

int temp = n1;

n1 = n2;

n2 = temp;

}

}

2.  What is the output of running the class C.

public class C {

public static void main(String[] args) {

Object o1 = new A();

Object o2 = new B();

System .out .print(o1);

System .out .print(o2);

}

}

class A extends B {

public String toString() {

return "A";

}

}