M8 - IntroToJavaAPI

8/10/2019 M8 - IntroToJavaAPI

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Course Code #Z16325

Java

M8 Introduction to Java API


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Contents

Java API Specifications java.lang package Object class Class class System class String and StringBuffer classes Math class java.util package


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Objectives

Navigate the Java API Specifications Describe the java.lang package Explore fundamental classes in java.lang package:

Object

Class System String StringBuffer Math

Describe the java.util package


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Java API Specifications

List of

Packages

List ofClasses

Package / ClassDescription

http://java.sun.com/j2se/1.5.0/docs/api/


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java.lang package

java.lang provides classes that are fundamental to thedesign of the Java programming language. Object class, the root of the class hierarchy. Class class, represents classes at run time.

Wrapper classes represent primitive types as objects. Math class provides mathematical functions. String and StringBuffer classes provide operations on

strings. System classes provide system operations. Throwable class represents errors and exceptions.

java.lang is implicitly imported in every Java sourcefile.


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Object classDeclaration: public class Object Class Object is the root of the class hierarchy. Every class has

Object as a superclass. All objects inherit the methods of this class.

Method Summary protected Object clone )

boolean equals Object obj)

protected void finalize )

Class


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Class classDeclaration: public final class Class extends Object

implements Serializable , GenericDeclaration, Type,AnnotatedElement

Instances of the class Class represent classes and interfaces in a

running Java application. Every array also belongs to a class that is reflected as a Class

object that is shared by all arrays with the same element type andnumber of dimensions.

The primitive Java types ( boolean, byte, char, short,

int, long, float, and double ), and the keyword void arealso represented as Class objects. Class has no public constructor. Instead Class objects are

constructed automatically by the Java Virtual Machine as classesare loaded in the class loader.


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Class classMethod Summary (Partial List)

static Class forName String className)

Class [] getClasses )

Constructor [] getConstructors )

Field [] getFields )

Class [] getInterfaces )

Method []

getMethods )

int getModifiers )

String getName )

Package getPackage )

String getSimpleName )

Class getSuperclass )

boolean isArray ) boolean isInstance Object obj)

boolean isInterface )

boolean isLocalClass )

boolean isMemberClass )

boolean isPrimitive )
http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/reflect/Constructor.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/reflect/Field.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/reflect/Method.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Package.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Package.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/reflect/Method.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/reflect/Field.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/reflect/Constructor.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.html


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System classDeclaration : public final class System extends Object

The System class contains several useful class fields and methodswhich are related to the following operations:

standard input, standard output, and error output streams.

access to externally defined properties and environment variables. a means of loading files and libraries. and a utility method for quickly copying a portion of an array.


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System classMethod Summary (Partial List)

static void arraycopy Object src, int srcPos, Object dest, int destPos, int length)

static String clearProperty String key)

static long currentTimeMillis )

static void exit int status)

static void gc )

static Map getenv )

static String getenv String name)

static Properties getProperties ) .

static SecurityManager getSecurityManager )

static void load String filename)

static long nanoTime )

static void runFinalization )

static void runFinalizersOnExit boolean value)

static void setErr PrintStream err)

static void setIn InputStream in)

static void setOut PrintStream out)

static void setProperties Properties props)

static void

setSecurityManager SecurityManager s)

Field Summary static PrintStream err

static InputStream in

static PrintStream out
http://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/util/Map.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/util/Properties.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/SecurityManager.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/io/PrintStream.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/io/InputStream.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/io/PrintStream.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/util/Properties.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/SecurityManager.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/io/PrintStream.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/io/InputStream.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/io/PrintStream.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/io/PrintStream.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/io/InputStream.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/io/PrintStream.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/SecurityManager.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/util/Properties.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/io/PrintStream.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/io/InputStream.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/io/PrintStream.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/SecurityManager.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/util/Properties.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/util/Map.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.html


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String classDeclaration : public final class String extends Object

implements Serializable, Comparable,CharSequence

The String class represents character strings. All string literals in Javaprograms are implemented as instances of this class.

Strings are immutable, their values cannot be changed after they arecreated

The class String includes methods for examining individualcharacters of the sequence, for comparing strings, for searching strings,

for extracting substrings, and for creating a copy of a string with allcharacters translated to uppercase or to lowercase.


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String classMethod Summary (Partial List)

char charAt int index)

int compareTo String anotherString)

String concat String str)

boolean contains CharSequence s)

boolean endsWith String suffix)

boolean equals Object anObject)

static String format String format, Object ... args)

int hashCode )

int indexOf int ch)

int length )

boolean matches String regex)

String replace char oldChar, char newChar)

String [] split String regex)

boolean startsWith String prefix)

String substring int beginIndex)

String toLowerCase )

String toUpperCase )

String

trim )
http://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/CharSequence.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/CharSequence.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.htmlhttp://java.sun.com/j2se/1.5.0/docs/api/java/lang/String.html


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StringBuffer classDeclaration : public final class StringBuffer

extends Object implements Serializable, CharSequence

StringBuffer is a thread-safe, mutable sequence of characters. AStringBuffer is like a String , but can be modified.

StringBuffer class has been supplemented with an equivalent classdesigned for use by a single thread, StringBuilder. The StringBuilder class should generally be used in preference to

StringBuffer as it supports all of the same operations but is fasteras it performs no synchronization.


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StringBuffer classMethod Summary (Partial List)

StringBuffer append String str)

StringBuffer append StringBuffer sb)

int capacity )

char charAt int index)

StringBuffer delete int start, int end)

StringBuffer deleteCharAt int index)

int indexOf String str)

StringBuffer insert int offset, String str)

int lastIndexOf String str)

int length )

StringBuffer replace int start, int end, String str)

StringBuffer reverse )

void setCharAt int index, char ch)

void setLength int newLength)

String substring int start)

String substring int start, int end)

String toString )

void trimToSize )
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Math class

Declaration : public final class Math extends Object

Math class contains methods for performing basic numericoperations such as elementary exponential, logarithm, square root,and trigonometric functions.

Math class cannot be extended (it is declared final ) nor instantiated(its constructor is private ).

Its methods are declared static and can be invoked using its classname.


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Math classMethod Summary (Partial List)

static double abs double a)

static double ceil double a)

static double cos double a)

static double exp double a)

static double floor double a)

static double log double a)

static double log10 double a)

static double log1p double x)

static double max double a, double b)

static double min double a, double b)

static double pow double a, double b)

static double random )

static long round double a)

static double sin double a)

static double sqrt double a)

static double tan double a)

static double toDegrees double angrad)

static double

toRadians double angdeg)

Field Summary static double E

static double PI
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Wrapper Classes

The wrapper classes serve two primary purposes:

To provide a mechanism to "wrap" primitive values in an object sothat the primitives can be included in activities reserved for objects,such as being added to collections, or returned from a method with anobject return value.

To provide an assortment of utility functions for primitives. Most ofthese functions are related to various conversions: convertingprimitives to and from String objects, and converting primitives andString objects to and from different bases (or radix), such as binary,octal, and hexadecimal.


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Wrapper Classes Constructors

short or StringShortshort

long or StringLonglongint or StringIntegerint

float, double, or StringFloatfloat

double or StringDoubledouble

charCharacterchar

byte of StringBytebyte

boolean or String or nullBooleanboolean

Constructor ArgumentsWrapper ClassPrimitive


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java.util package

Contains classes related to the following: Collections framework Legacy collection classes Event model Date and time facilities Internationalization Miscellaneous utility classes

StringTokenizer, random-number generator, and bit array


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Key Points The Java API is prewritten code organized into packages of similar topics java.lang provides classes that are fundamental to the design of the

Java programming language java.lang contains the following classes: Object , Class , Math ,

String , StringBuffer , Throwable, Wrapper classes and Systemclasses

java.lang package is implicitly imported in every Java source file Object is the superclass of all classes String objects are immutable java.util contains classes related to the following:

Collections framework

Legacy collection classes Event model Date and time facilities Internationalization Miscellaneous utility classes

Documents

M8 - IntroToJavaAPI