4444 > java 1 > Flashcards

java 1 Flashcards

(49 cards)

Study These Flashcards
1
Q

why use java script?

A

adds interactivity and visual enhancement

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2
Q

java mainly used for

A

client-side scripting

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3
Q

using java with client-side scripting means that there’s no _____

A

internet traffic or server processing of client requests

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4
Q

java cons

A
  • client may not have sufficient processing resources
  • java can be turned off for security reasons
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5
Q

t/f: javascript is the same as JAVA

A

false

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6
Q

JavaScript is not JAVA because:

A
  1. no graphical user interface
  2. no read/write file access
  3. not a class-based object model
  4. no multithreading
  5. does not need the Java Virtual Machine, needs a browser
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7
Q

what java can do (client-side):

A
  • control browser features
  • modify document appearance
  • modify document content
  • stored and use info abt user
  • manipulate images
  • react to state of browser and client system
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8
Q

CSS can handle (Java not necessary):

A
  • hover and focus events
  • image swaps
  • basic animation
  • drop-down menus
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9
Q

java script can achieve (that CSS can’t):

A
  • visual enhancements
  • advanced animation
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10
Q

2 places to put JavaScript

A

under title in HTML head, put Java in its own file

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11
Q

how to embed Java in HTML

A

under title in script element in head section

<script>
CODE GOES HERE
</script>

</head>

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12
Q

t/f: JavaScript code can be inserted anywhere in HTML, including the body

A

true

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13
Q

t/f: there are limits on how many script tags can be embedded in the HTML code of a web page

A

false

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14
Q

how to put javascript in its own file

A

<head>
<title></>


</head>
</title></head>















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15










Q













src attribute of script element specifies

















A













the URL of external code source















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16










Q













which way to use java is the best way for code reuse

















A













putting java in own file















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17










Q













valid variable names consist of

















A













letters, digits, underscores, and dollar signs















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18










Q













valid variable names do not begin with

















A













a digit, not a reserved java keyword















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19










Q













t/f: java is not case sensitive

















A













false















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20










Q













what statement declares a variable












Study These Flashcards








A













var or let
var varName = 1;
















21










Q













java variables have ____ data types

















22










Q













what is var cars = [“Saab”, “Volvo]

















23










Q













what is var x = {firstname:”John”, lastname:”Doe”};

















24










Q













%












Study These Flashcards








A













modulus (remainder)
















25






++/- -








increment, decrement











26






var a = 10;

b=a++;
b=++a;








(a=11, b=10)
(a=11, b=11)











27






var a = 3;
var b = "3";
var c = (a==b);
var d = (a===b);








c = true
d = false











28






and, or, not operators








&&, ||, !











29






java comment








//











30






multiple line java comment








/*
*/











31






number








java function that converts a value to numeric data type











32






x = "hello" + 5








x = "hello5"











33






x = "5" + 5








x = "55"











34






x = number("5") + 5








x = 10











35






get length of variable x="Virginia Tech:








var y = x.length











36






change variable to all caps or all lower








x = x.toUpperCase()
x = x.toLowerCase()











37






how to get current date and time








var a = newDate()











38






2 control structures








conditions and loops











39






3 types of loops








while, do, for











40






if condition








if (condition) {
     code
}
else {
     code
};











41






while loop








while (condition)
{
     //loop code goes here
};











42






do loop








do
{
     //loop code goes here
} while (condition);











43






for loop








for(statement 1; condition; statement 2){
     //loop code
};

**statement 1 starts before loop, statement 2 is done after every iteration











44






input/output in java is limited bc of








security











45






output








- window.alert()
- document.writeln() or document.write()











46






input








- window.prompt()
- confirm() (ok/cancel box)











47






debug








- console.log()
- console.error()











48






date methods are based on








time since a given date











49






date methods








getHours, getDay, getDate, getMinutes, getMonth, getFullYear
























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