찾으시는 정보가 있으시다면
주제별reference를 이용하시거나
우측 상단에 있는 검색기능을 이용해주세요

Java Strings

Storing text

String variable contains a collection of characters

• surrounded by double quotes

actually, object

• which contain method

  • that can perform certain operations on strings

Method()

length() length of a string

toUpperCase(), toLowerCase()

indexOf()

• index of the first occurrence of a specified text in a string(including whitespace)

concat() : concatenation(“+”)

• ex) name.concat(lastName);

Special Characters

Strings must be written within quotes

• Java misunderstand special characters

Use backslash“\” escape character

5 other escape sequences

• \n new line

• \r carriage return

  • move cursor to the beginning of the string and overwrite

• \t tab

• \b backspace

• \f form feed

Hello it was \f great meeting

output “Hello it was
                    great metting”

Adding numbers and strings

If you add a number and a string, the result will be a string concatenation

Java Math

Math.max(x,y) : find the highest value of x and y

min(x,y) : lowest

abs(x) : absolute

sqrt(x) : square root

random() : returns random number between 0.0(inclusive) ~ 1.0(exclusive)