# AP CSA Unit 2: Objects

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## Tags and Description

### 16 Terms

1

object

a data type that is created in Java

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2

Math class

stores common numbers used in mathematical calculations and methods that have mathematical functions

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3

static method

belong to a class but not to any instances of that specific class

can be called without class’s instance or object

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4

Math.abs(x)

gets the absolute value of ‘x’ ; the return value is always positive

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5

Math.pow(x,y)

does ‘x’ to the power of ‘y’ (x^y); the answer will always be a double(decimal) value

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6

Math.PI

stores the value for pi: 3.141592653…

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7

charAt(int x)

returns the char at the given index of ‘x’

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8

contains(String s)

returns true when received string is within the called string, false otherwise

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9

endsWith(String s)

returns true when received string ends with called string, false otherwise

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10

equals(String s)

returns true when the two strings are equal, false otherwise

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11

equalsIgnoreCase(String s)

returns true when the two strings are equal ignoring the case( lower or upper), false otherwise

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12
``public class Example{public static void main(String[] args){String s = "I like apples";String g = "ILIKEAPPLES";//What is returned from this line of code?System.out.println(s.equals(g));}}``

false

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13
``public class Example{public static void main(String[] args){String s = "I like apples";String g = "ILIKEAPPLES";//What is returned from this line of code?System.out.println(toLowerCase(g));}}``

ilikeapples

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14
``public class Example{public static void main(String[] args){int x = 2;int y = 10;int z = Math.pow(y,x);System.out.println(z);}}``

100.00

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15
``public class Example{public static void main(String[] args){int x = 2;int y = -10.9;int z = Math.abs(y);//what is printed from this programSystem.out.println(z);}}``

10.9

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16
``public class Example{public static void main(String[] args){String hi  = "hello, John Harvard";//what is printed from this program?System.out.println(hi.charAT(7));}}``

J

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