StringBuffer
public final class StringBuffer -> final:inheritanceX
extends Object
implements Serializable, CharSequence serialization
usage type)
- StringBuffer() : memory saving , stringfaster than.
implicitly 16characters store possible object creation
(when initial value not specified)
- StringBuffer(int size) : size size object creation
- StringBuffer(String str) : str specified as string
additionally 16characters more store possible object creation
java.lang package : all Java program auto included as package
Number:abstract class -> objectdefinitionnewoperation not usable ,referencevariable useonly possible
public abstract class Number ->abstract abstract->objectdefinitionX
extends Object
implements Serializable
objectdefinition forX
sub class inheritancefor making
( AtomicInteger, AtomicLong, BigDecimal, BigInteger, Byte,
Double, Float, Integer, Long, Short)
Math : stativmemberfunction
Object class
Equals() : function basichandling: addressvalue comparison + re-definition needed.
clone() : protected Object clone() //externalfrom accessX
throws CloneNotSupportedException
// Exception try catch block only through call possible.
// (exception handling forcreated function!)
wrapper(Wrapper) class : 8to's basic data type object use possible class provide.
// : Boolean, Character, Byte, Short, Integer, Long, Float, Double
// Number class inheritance
Integer CLASS
public final class Integer
extends Number
implements Comparable<Integer>
exception handling :try,catch block creates.(more complete program for)
