Nanarin🙃

docs.oracle.com/en/java/javase/15/docs/api/java.base/java/math/BigInteger.html BigInteger (Java SE 15 & JDK 15) All Implemented Interfaces: Serializable, Comparable public class BigInteger extends Number implements Comparable Immutable arbitrary-precision integers. All operations behave as if BigIntegers were represented in two's-complement notation (like Java's pri docs.oracle.com java.math에 속해..

docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/Math.html Math (Java SE 15 & JDK 15) public final class Math extends Object The class Math contains methods for performing basic numeric operations such as the elementary exponential, logarithm, square root, and trigonometric functions. Unlike some of the numeric methods of class StrictMath, docs.oracle.com java.lang에 속해있는 클래스. 수학에서 ..

docs.oracle.com/en/java/javase/15/docs/api/java.base/java/lang/String.html#indexOf(int) 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 docs.ora..

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..

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..