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  1. AP Computer Science A
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What does the following code output?

java
int x = 10;
if (x > 5) {
    x = x * 2;
}
System.out.println(x);

20

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All Flashcards

What does the following code output?

java
int x = 10;
if (x > 5) {
    x = x * 2;
}
System.out.println(x);

20

What does the following code output?

java
int i = 0;
while (i < 4) {
    System.out.print(i + " ");
    i++;
}

0 1 2 3

What does the following code output?

java
String str = "Hello";
System.out.println(str.substring(1, 4));

ell

What does the following code output?

java
int[] arr = {5, 10, 15};
System.out.println(arr[1]);

10

What does the following code output?

java
String s1 = "Java";
String s2 = "Java";
System.out.println(s1.equals(s2));

true

What does the following code output?

java
int sum = 0;
for (int i = 1; i <= 3; i++) {
    sum += i;
}
System.out.println(sum);

6

What does the following code output?

java
String str = "Computer";
System.out.println(str.length());

8

Identify the error in the following code:

java
int[] arr = new int[3];
System.out.println(arr[3]);

ArrayIndexOutOfBoundsException: Index 3 is out of bounds for an array of length 3.

What does the following code output?

java
int x = 3;
if (x % 2 != 0) {
    System.out.println("Odd");
} else {
    System.out.println("Even");
}

Odd

What does the following code output?

java
String str = "Hello World";
System.out.println(str.indexOf("World"));

6

What are the steps to execute an 'if' statement?

  1. Evaluate the condition. 2. If true, execute the code block. 3. If false, skip the code block.

What are the steps to execute a 'for' loop?

  1. Initialize the loop variable. 2. Check the condition. 3. If true, execute the loop body. 4. Increment/decrement the loop variable. 5. Repeat steps 2-4 until the condition is false.

What are the steps to execute a 'while' loop?

  1. Check the condition. 2. If true, execute the loop body. 3. Update the loop variable (if necessary). 4. Repeat steps 1-3 until the condition is false.

What are the steps to create an object from a class?

  1. Declare a variable of the class type. 2. Use the 'new' keyword followed by the class name and parentheses. 3. Optionally, initialize the object's fields.

What is a conditional statement?

A statement that executes code based on a true/false condition.

What is an 'if' statement?

A one-way selection statement that executes code if a condition is true.

What is a 'for' loop?

A loop that repeats a block of code a specific number of times.

What is a 'while' loop?

A loop that repeats a block of code until a condition is false.

What is a String?

A sequence of characters; an object in Java.

What is an Array?

A data structure that stores multiple values of the same type.

What is a Class?

A blueprint for creating objects; defines data and behavior.

What is an Object?

An instance of a class.

What is Inheritance?

A mechanism where a class inherits properties and methods from another class.

What is Polymorphism?

The ability of objects of different classes to be treated as objects of a common type.