AP CSA Unit 2: Objects

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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 program
System.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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