Page 1/2 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...

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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 a
ay
Object oriented design
class design and use
encapsulation
eference and object manipulation
static vs. instance data fields and methods
a
ays 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 , A
ayList , File ,
wrapper classes ( Integer , Float , Character ) and the Comparable 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";
        }
}
Sample Placement Exams for Placement out of CSCI-UA.101:
Topics Covered by the Java Placement Exam
Page 2/2
class    B    {
        public    String    toString()    {
                return    "B";
        }
}
3. Write a Java class Point that represents (x,y) point in a plane. The class should implement
Comparable interface. The points should be compared based on their distance from the origin
(point (0,0)). The distance from the origin can be computed using distance= $$\sqrt{x^{2}+y^{2}}$$.
Your class should implement all methods needed for the following code to compile and run successfully:
Random    r    =    new    Random;
Point    []    myPoints    =    new    Point[10];
for    (int    i    =    0;    i    <    myPoints.length;    i++)
            myPoints[i]    =    new    Point(r.nextDouble(),    r.nextDouble()    );
A
ays.sort(myPoints);
You do not need to provide any additional methods.
4. Write a method that, given an a
ay of Circle objects, sorts the circles from smallest to largest. Assume
that the Circle class is defined as follows:
public    class    Circle    {
        private    float    radius;
        public    Circle    (    float    r    )    {
                if    (r    >=0    )    radius    =    r;
                else    radius    =    1;
        }
        public    float    getRadius()    {
                return    radius;
        }
        public    int    compareTo(    Circle    c    )    {
                if    (radius    ==    c.radius    )    return    0;
                else    if    (radius    <    c.radius    )    return    -1;
                else    return    1;
        }
}
You should use the following signature for the method:
void    sortCircles    (    Circle    []    circles    )
You can use any sorting algorithm we discussed.

csci-ua101sampleexam-pmho222o-xxtpbbhb.pdf

Answered 2 days After Nov 09, 2022

Solution

Vikas answered on Nov 12 2022

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