Section 1
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Variable assignment
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Last updated
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Date created
Mar 1, 2020
Cards (65)
Section 1
(50 cards)
Variable assignment
looks like initialization but occurs afterwards
What classes are in the util package?
Scanner, ArrayList, Random
What classes are in the lang package?
String, Double, Character, Math, Integer, and System
How to raise double num to the power of double num2
Math.pow(num,num2);
format specifier for doubles to two decimal places
%.2f
Variable declaration
int n;
What is the only variable type that words for the pow(); method?
double
How to re-assign n as n+8?
n+=8;
What logical operator means and?
&&
What logical operator means or?
||
What is used to find remainder?
%
format specifier for strings
%s
What is used to divide?
/
What is used to multiply?
*
How to add one to n?
n++;
Method to turn String word into an integer?
Integer.parseInt(word);
When to use printf?
With format specifiers
How to re-assign n as n-3?
n-=3;
How to subtract one from n?
n--;
Method to make the number in char c into an integer?
Character.getNumericValue(c);
What goes at the first line?
import java.util.*;
How to make a word be all lower case
word=word.toLowerCase();
What should strings always be in?
" "
What goes after any variable declaration/initialization?
Scanner in=new Scanner(System.in);
format specifier for char
%c
How to create a substring of the first two letters of a word?
String substring=word.substring(0,2);
Array declaration with six spots
int [] intArray=new int[6];
What should chars always be in?
' '
What number will be given if the character of the indexOf() method is not in the word?
-1
How to determine where a space is for a word and store it as the integer space
int space=word.indexOf(' ');
What goes on the second line?
public class info {
How to calculate circumference
double circumf=2radiusMath.PI;
What are the two packages that I know?
util and lang
What is the parameter for println();
String
How to take a square root of a double dNum
Math.sqrt(dNum);
What to put in between in.nextInt and in.nextLine?
in.nextLine();
Variable initialization
n=3;
What logical operator means not?
!
What causes enter to be pressed in a printf?
format specifier for integers
%d
Variable declaration and initialization
int n=3;
How to assign integer to whatever user inputs?
n=in.nextInt();
What line will give if the first letter of someone's name is b?
name.charAt(0)=='b'
What are Boolean variables?
true/false statements
Concatenation operator
+
When to use println?
With concatenation operators
Method to turn the String word into a double?
Double.parseDouble(word);
What goes on third line?
public static void main(String[] args) {
Array declaration and initialization
int [] arr1={1,2,3,4,5};
What are the relational operators?
<, >, <=, >=, ==
Section 2
(15 cards)