SCJP Quiz | OCJP Quiz | OCJP Online Test Series 2 | Java Online Test

Given:
11. double input = 314159.26;
12. NumberFormat nf = NumberFormat.getInstance(Locale.ITALIAN);
13. String b;
14. //insert code here
Which code, inserted at line 14, sets the value of b to 314.159,26?

class Money {
private String country = “Canada”;
public String getC() { return country; }
}
class Yen extends Money {
public String getC() { return super.country; }
}
public class Euro extends Money {
public String getC(int x) { return super.getC(); }
public static void main(String[] args) {
System.out.print(new Yen().getC() + ” ” + new Euro().getC());
}
}

What is the result?

Given:
public class Test {
public static void main(String [] args) {
int x = 5;
boolean b1 = true;
boolean b2 = false;

if ((x == 4) && !b2 )
System.out.print(“1 “);
System.out.print(“2 “);
if ((b2 = true) && b1 )
System.out.print(“3 “);
}
}

What is the result?

Given:
public class LineUp {
public static void main(String[] args) {
double d = 12.345;
// insert code here
}
}

Which code fragment, inserted at line 4, produces the output | 12.345|?

Given:

class A{

static void test() throws RuntimeException {
try {
System.out.print(“test “);
throw new RuntimeException();
}
catch (Exception ex) { System.out.print(“exception “); }
}
public static void main(String[] args) {
try { test(); }
catch (RuntimeException ex) { System.out.print(“runtime “); }
System.out.print(“end “);
}

}

What is the result?

Given:
StringBuilder sb1 = new StringBuilder(“123”);
String s1 = “123”;
// insert code here
System.out.println(sb1 + ” ” + s1);

Which code fragment, inserted at line 24, outputs “123abc 123abc”?

public class TestString1 {
public static void main(String[] args) {
String str = “420”;
str += 42;
System.out.print(str);
}
}

What is the output?

Given:
interface Foo {}
class Alpha implements Foo {}
class Beta extends Alpha {}
class Delta extends Beta {
public static void main( String[] args ) {
Beta x = new Beta();
Foo f = (Delta)x;// insert code here
}
}

Which code, inserted at line 16, will cause a java.lang.ClassCastException?

Given:
11. abstract class Vehicle { public int speed() { return 0; }
12. class Car extends Vehicle { public int speed() { return 60; }
13. class RaceCar extends Car { public int speed() { return 150; }
…
21. RaceCar racer = new RaceCar();
22. Car car = new RaceCar();
23. Vehicle vehicle = new RaceCar();
24. System.out.println(racer.speed() + “, ” + car.speed()
25. + “, ” + vehicle.speed());

What is the result?

A team of programmers is reviewing a proposed API for a new utility class. After some discussion,
they realize that they can reduce the number of methods in the API without losing any
functionality. If they implement the new design, which two OO principles will they be promoting?

class Test{

public static void main(String args[]){
Object [] myObjects = {
new Integer(12),
new String(“foo”),
new Integer(5),
new Boolean(true)
};
Arrays.sort(myObjects);
for(int i=0; i

public class Person {
private String name;
public Person(String name) { this.name = name; }
public boolean equals(Person p) {
return p.name.equals(this.name);
}
}

Which statement is true?

class A{

public static void main(String args[]){

StringBuilder sb1 = new StringBuilder(“123”);
String s1 = “123”;
sb1.concat(“abc”); s1.append(“abc”);// insert code here
System.out.println(sb1 + ” ” + s1);
}
}

Which code fragment, inserted at line 24, outputs “123abc 123abc”?

class Test{

static void test() throws RuntimeException {
try {
System.out.print(“test “);
throw new RuntimeException();
}
catch (Exception ex) { System.out.print(“exception “); }
}
public static void main(String[] args) {
try { test(); }
catch (RuntimeException ex) { System.out.print(“runtime “); }
System.out.print(“end “);
}
}

What is the result?

public class Test{
Integer i;
int x;
public Test(int y) {
x = i+y;
System.out.println(x);
}
public static void main(String[] args) {
new Test(new Integer(4));
}
}

What is the result?

class Test{
public static void main(String args[]){

int x = 0;
int y = 10;
do {
y–;
++x;
} while (x < 5); System.out.print(x + "," + y); } } What is the result?

class Test{
public static void main(String args[]){

try {
// some code here
} catch (NullPointerException e1) {
System.out.print(“a”);
} catch (Exception e2) {
System.out.print(“b”);
} finally {
System.out.print(“c”);
}

}
}

If some sort of exception is thrown at line 34, which output is possible?

class Test{

public void go() {
String o = “”;
z:
for(int x = 0; x < 3; x++) { for(int y = 0; y < 2; y++) { if(x==1) break; if(x==2 && y==1) break z; o = o + x + y; } } System.out.println(o); } public static void main(String args[]){ Test t=new Test(); t.go(); } } What is the result when the go() method is invoked?

public class Test {
public static void main(String[] args) {
boolean assertsOn = true;
assert (assertsOn) : assertsOn = true;
if(assertsOn) {
System.out.println(“assert is on”);
}
}
}

If class Test is invoked twice, the first time without assertions enabled, and the second time with
assertions enabled, what are the results?

public class Test {
public static void main(String[] args) {
Float pi = new Float(3.14f);
if (pi > 3) {
System.out.print(“pi is bigger than 3. “);
}
else {
System.out.print(“pi is not bigger than 3. “);
}
finally {
System.out.println(“Have a nice day.”);
}

}
}

What is the result?