Java Programming Fundamentals Flashcard

Front

Which of the following correctly declares an integer variable in Java? Options: int num = 3;, int num <- 3;, integer num = 3;, int num == 3;

Back

int num = 3;

Front

What is the correct statement to import the Scanner class in Java?

Back

import java.util.Scanner;

Front

What is the correct way to create a Scanner object to read user input?

Back

Scanner sc = new Scanner(System.in);

Front

What method is used to find the length of a string in Java?

Back

length()

Front

Which method retrieves the character at a specific index in a string?

Back

charAt(int index)

Front

How do you check if two strings str1 and str2 are equal in Java? Options: str1 == str2, str1.equals(str2), str1.isEqualTo(str2)

Back

str1.equals(str2)

Front

Which method extracts a substring from a string?

Back

substring()

Front

How do you declare a double variable with an initial value of 3.14?

Back

double pi = 3.14;

Front

Which of the following correctly declares a boolean variable? boolean isTrue = true;, boolean isTrue == true;, bool isTrue = true;, isTrue: true;

Back

boolean isTrue = true;

Front

Which method converts all characters in a string to lowercase? Options: toLowerCase(), lower(), decapitalize(), toSmall()

Back

toLowerCase()