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docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/String.html#contains(java.lang.CharSequence) String (Java SE 15 & JDK 15) All Implemented Interfaces: Serializable, CharSequence, Comparable , Constable, ConstantDesc public final class String extends Object implements Serializable, Comparable , CharSequence, Constable, ConstantDesc The String class represents character strings. docs..

docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/String.html#replace(char,char) String (Java SE 15 & JDK 15) All Implemented Interfaces: Serializable, CharSequence, Comparable , Constable, ConstantDesc public final class String extends Object implements Serializable, Comparable , CharSequence, Constable, ConstantDesc The String class represents character strings. docs.oracle.com do..

docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/StringBuffer.html StringBuffer (Java SE 15 & JDK 15) All Implemented Interfaces: Serializable, Appendable, CharSequence, Comparable public final class StringBuffer extends Object implements Serializable, Comparable , CharSequence A thread-safe, mutable sequence of characters. A string buffer is like a String docs.oracle.com java.lang..

docs.oracle.com/en/java/javase/15/docs/api/java.base/java/util/StringTokenizer.html StringTokenizer (Java SE 15 & JDK 15) All Implemented Interfaces: Enumeration public class StringTokenizer extends Object implements Enumeration The string tokenizer class allows an application to break a string into tokens. The tokenization method is much simpler than the one used by the Stre docs.oracle.com jav..

아스키코드란? : ASCII stands for the "American Standard Code for Information Interchange". It's a 7-bit character set containing 128 characters. 정보 교환을 위한 미국 표준 코드. 7비트 문자 집합. www.asciicharstable.com/ ASCII characters table www.asciicharstable.com

docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/String.html#format(java.lang.String,java.lang.Object...) String (Java SE 15 & JDK 15) All Implemented Interfaces: Serializable, CharSequence, Comparable , Constable, ConstantDesc public final class String extends Object implements Serializable, Comparable , CharSequence, Constable, ConstantDesc The String class represents character s..

byte (byte)0 short (short)0 int 0 long 0L float 0.0f double 0.0d char '\u0000' boolean false 참조형 공백참조 or null ※ !!! 배열 생성시 & 인스턴스 변수 & 클래스 변수 !!! ※ 지역 변수는 초기값으로 초기화되지 않음. 꼭 초기화를 실행해야한다.

docs.oracle.com/en/java/javase/15/docs/api/java.base/java/util/Scanner.html#hasNextInt() Scanner (Java SE 15 & JDK 15) All Implemented Interfaces: Closeable, AutoCloseable, Iterator public final class Scanner extends Object implements Iterator , Closeable A simple text scanner which can parse primitive types and strings using regular expressions. A Scanner breaks its input docs.oracle.com java.u..

docs.oracle.com/en/java/javase/15/docs/api/java.base/java/io/BufferedReader.html BufferedReader (Java SE 15 & JDK 15) All Implemented Interfaces: Closeable, AutoCloseable, Readable Direct Known Subclasses: LineNumberReader public class BufferedReader extends Reader Reads text from a character-input stream, buffering characters so as to provide for the efficient reading of docs.oracle.com docs.or..

docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/Character.html#getNumericValue(int) Character (Java SE 15 & JDK 15) All Implemented Interfaces: Serializable, Comparable , Constable public final class Character extends Object implements Serializable, Comparable , Constable The Character class wraps a value of the primitive type char in an object. An object of class Chara docs.oracl..