JAVA

Suppose s is a string with the value "java. What will be assigned to x if you execute the following code?

Which of the following statements is preferred to create a string "Welcome to Java"?

What is the output of the following code?

public class Test {
public static void main(String[] args) {
String s1 = "Welcome to Java!";
String s2 = s1;

if (s1 == s2)
System.out.println("s1 and s2 reference to the same String object");
System.out.println("s1 and s2 reference to different String objects");
}
}

What is the output of the following code?

public class Test {
public static void main(String[ ] args) {
String s1 = "Welcome to Java!";
String s2 = "Welcome to Java!";

if (s1 == s2)
System.out.println("s1 and s2 reference to the same String object");
else
System.out.println("s1 and s2 reference to different String objects");
}
}

What is the output of the following code?

String s = "University";
s.replace("i", "ABC");
System.out.println(s);

What is the printout for the first println statement in the main method?

public class Foo {
static int I = 0;
static int j = 0;

public static void main(String[ ] args) {
int I = 2;
int k = 3;
{
int j = 3;
System.out.println("i + j is " + I + j);
}

k = I + j;
System.out.println("k is " + k);
System.out.println("j is " + j);
}
}

What is the return value of "SELECT".substring(0, 5)?

Which of the following is the correct statement to return JAVA?

You can declare two variables with the same name in ____.

Analyze the following code.

int[ ] list = new int[5];
list = new int[6];

Analyze the following code.

public class Test {
public static void main(String[ ] args) {
int[ ] x = new int[3];
System.out.println("x[0] is " + x[0]);
}
}

Analyze the following code:

public class Test {
public static void main(String[ ] args) {
int[ ] oldList = {1, 2, 3, 4, 5};
reverse(oldList);
for (int I = 0; I < oldList.length; i++)
System.out.print(oldList[i] + " ");
}

public static void reverse(int[ ] list) {
int[ ] newList = new int[list.length];

for (int I = 0; I < list.length; i++)
newList[i] = list[list.length - 1 - i];

list = newList;
}
}

How many elements are in array double[ ] list = new double[5]?

If you declare an array double[ ] list = {3.4, 2.0, 3.5, 5.5}, list[1] is ________.

If you declare an array double[ ] list = {3.4, 2.0, 3.5, 5.5}, the highest index in array list is ________.

The JVM stores the array in an area of memory, called ________, which is used for dynamic memory allocation where blocks of memory are allocated and freed in an arbitrary order.

When invoking a method with an object argument, ________ is passed.

When you pass an array to a method, the method receives ________.

The selectionSort method is defined in this section. What is list1 after executing the following statements?

double[ ] list1 = {3.1, 3.1, 2.5, 6.4};
selectionSort(list1);

An object is an instance of a ________.

A method that is associated with an individual object is called ________.

Given the declaration Circle x = new Circle(), which of the following statement is most accurate?

Given the declaration Circle[ ] x = new Circle[10], which of the following statement is most accurate?

The keyword ________ is required to declare a class.

To declare a constant MAX_LENGTH as a member of the class, you write

When you return an array from a method, the method returns ________.

________ is a construct that defines objects of the same type.

________ is invoked to create an object.

________ represents an entity in the real world that can be distinctly identified.

Suppose x = 1, y = -1, and z = 1. What is the printout of the following statement?

if (x > 0)
if (y > 0)
System.out.println("x > 0 and y > 0");
else if (z > 0)
System.out.println("x < 0 and z > 0");

The "less than or equal to" comparison operator in Java is ________.

The equal comparison operator in Java is ________.

The following code displays ________.

double temperature = 50;

if (temperature >= 100)
System.out.println("too hot");
else if (temperature <= 40)
System.out.println("too cold");
else
System.out.println("just right");

What is 1 + 1 + 1 + 1 + 1 == 5?

What is the output of the following code?

boolean even = false;
System.out.println((even? "true": "false"));

What is the printout of the following switch statement?

char ch = 'b';

switch (ch) {
case 'a':
System.out.print(ch);
case 'b':
System.out.print(ch);
case 'c':
System.out.print(ch);
case 'd':
System.out.print(ch);
}

Which of the following code displays the area of a circle if the radius is positive?

Which of the following is the correct expression that evaluates to true if the number x is between 1 and 100 or the number is negative?

Analyze the following fragment:

double sum = 0;
double d = 0;
while (d!= 10.0) {
d += 0.1;
sum += sum + d;
}

Do the following two statements in (I) and (II) result in the same value in sum?

(I):
for (int I = 0; i<10; ++i) {
sum += i;
}

(II):
for (int I = 0; i<10; i++) {
sum += i;
}

How many times will the following code print "Welcome to Java"?

int count = 0;
while (count < 10) {
System.out.println("Welcome to Java");
count++;
}

How many times will the following code print "Welcome to Java"?

int count = 0;
do {
System.out.println("Welcome to Java");
count++;
} while (count < 10);

What is the number of iterations in the following loop:

for (int I = 1; I <= n; i++) {
// iteration
}

What is the output for y?

int y = 0;
for (int I = 0; i<10; ++i) {
y += i;
}
System.out.println(y);

Will the following program terminate?

int balance = 10;

while (true) {
if (balance < 9) continue;
balance = balance - 9;
}

Why do computers use zeros and ones?

________ consists of a set of separate programs for developing and testing Java programs, each of which is invoked from a command line.

Analyze the following code.

import javax.swing.*;

public class ShowErrors {
public static void main(String[ ] args) {
int i;
int j;
String s = JOptionPane.showInputDialog(null, "Enter an integer", "Input",
JOptionPane.QUESTION_MESSAGE);
j = Integer.parseInt(s);
I = (i + 4);
}
}

Analyze the following code.

public class Test {
public static void main(String[ ] args) {
int month = 09;
System.out.println("month is " + month);
}
}

If you enter 1 2 3, when you run this program, what will be the output?

import java.util.Scanner;

public class Test1 {
public static void main(String[ ] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter three numbers: ");
double number1 = input.nextDouble();
double number2 = input.nextDouble();
double number3 = input.nextDouble();
// Compute average
double average = (number1 + number2 + number3) / 3;
// Display result
System.out.println(average);
}
}