![Version 1.7 (string in switch)
Import Java. Io. *;
Class strswitch
{
Public static void main(string g[])
{
String s=“aaa”;
Switch (s)
{
Case “aaa”:
system.out.println(“from aaa”);
Case “bbb”:
system.out.println(“from bbb”);
Default:
system.out.println(“from default”);
}}}](https://image.slidesharecdn.com/historyofjava-130617214933-phpapp01/85/History-of-java-19-320.jpg)
![Integer literal
Import java.io.*;
Class intliteral
{
Public static void main(string g[])
{
int a=12_78_56;
System.out.println(“a=“+a);
}
}](https://image.slidesharecdn.com/historyofjava-130617214933-phpapp01/85/History-of-java-21-320.jpg)
History of java'
- 2. JAVA • Father of Java: James Gasoline EXPANSIONS: • API-Application Programming Interface • SDK-Software Development Kit • JVM-Java virtual machine
- 3. History of Java • 1990 oak : To control microprocessors Embedded in customer item • Oak needed to be – Platform independent – Extremely reliable – Compact • 1993: Java – Internet and web exploration – Internet application • 1994: Hot Java Browser • 1995: java1. 0
- 4. VERSIONS OF JAVA • 1995 version 1.0: – The Java development kit was released for free by the sun – 8-packages 212-classes – Microsoft and other companies licensed Java • 1997 version 1.1: – 23 -packages 504-classes – Improvement include better event handling inner classes , improved jvm
- 5. – Microsoft developed its own 1.1 compatible Java virtual machine for internet explorer – Many browsers in use are still compatible only with 1.1 1999 version 1.2: -It is also called as the Java 2 platform -59 packages 1520 classes -Code & tools distributed as the SDK -A Java foundation class based on swings for improved graphics and user interfaces
- 6. – Collection API included list sets and hash map 2000 VERSION 1.3: - 76 packages 1842 classes - Java sound 2002 VERSION 1.4: - 135 PACKAGES 2991 classes - Improved I , xml support etc.., 2004 VERSION 5.0 (1.5): - 165 packages over 3000 classes - Faster startup metadata formatted output
- 7. – Generic to operate on objects of various types 2006 JAVA SE 6: – Scripting language support 2011 JAVA SE 7: – JVM support for dynamic language – String in switch – Allowing underscores in numeric literals FUTURE RELEASES: JAVA SE 8: – LAMBDA OPERATOR is expected in summer 2013 JAVA SE 9: – Under planning
- 8. PACKAGES • Each class has different methods is called packages
- 9. FEAUTURES OF JAVA TECHNOLOGY PLATFORM INDEPENDENT: – Write once run anywhere OBECT ORIENTED: – No coding outside of class definitions including main () – An extensive class library available in the core language packages
- 10. COMPILER AND INTERPRETER: – Code is compiled to byte codes that are interpreted by a JVM – This provides portability to any machine for which a virtual machine has been written – The two steps of compilation and interpretation allow for extensive code checking and improved security ROBUST: – Exception handling built-in strong type checking
- 11. Several dangerous features of c & c++ – No memory pointers – No pre processor – Garbage collector AUTOMATIC MEMORY MANAGEMENT: – Automatic garbage collection memory management handled by the JVM SECURITY: – No memory pointers – Programs run inside the virtual machine sandbox
- 12. CODE PATHOLOGIES REDUCED BY: Byte code verifier: – Checks classes after loading Class loaders: – Confines object of unique namespace Security manager: – Determines what resources a class can access
- 13. Java Source (. Java) Java compiler Java byte code (. Byte) Java byte code move locally or through the network Class loader byte codes Verifier Java class libraries Java interpreter Just in time compiler Run time system Operating system Hardware
- 14. Difference c • Focus on logic • Procedure or structure oriented • Top – down approach (Based on variable declaration) c++ • Focus on both logic and data • Object oriented programming language • Bottom – top approach (Variable declaration
- 15. C++ • Partially object oriented language • Pointers concept and Preprocessor are available • Operator overloading is available • Platform dependent • A destructor is used to free the memory • The compiler is present JAVA • Purely object oriented language • Pointers concept and Preprocessor is not available • Operator overloading is not available • Platform independent • Automatic garbage collection • Both compiler and interpreter is present
- 16. Markup language • HTML, XML • Design based language Programming language • C, C++, JAVA etc.., • Logic based language
- 17. XML • User defined tags • Focused on data storage • Case sensitive HTML • Predefined tags • Focused on design • Non case sensitive
- 18. Difference between function member function and method Function: • Independent calling (in c) Member function: • Partially dependent on object (in c++) (Members of class) Methods: • Fully dependent on object (Java)
- 19. Version 1.7 (string in switch) Import Java. Io. *; Class strswitch { Public static void main(string g[]) { String s=“aaa”; Switch (s) { Case “aaa”: system.out.println(“from aaa”); Case “bbb”: system.out.println(“from bbb”); Default: system.out.println(“from default”); }}}
- 20. Output from aaa
- 21. Integer literal Import java.io.*; Class intliteral { Public static void main(string g[]) { int a=12_78_56; System.out.println(“a=“+a); } }
- 22. Output a=127856
- 23. Special Keywords in Java • Static • Final • Volatile • Transient • Strictfp • Assert • Byte • Native • Boolean
- 24. Final: – Final is also like constant the give value can not change throughout the program Transient: – Used within a certain period of time So it's not used more Strictfp: – Display the exact result in a float Assert: – Implementing our assumption
- 25. Native: – A program created in c can be accessed in Java Byte: – Between range (-128 to 0 to 127) – Eg: byte b=123 is accepted Byte b=129 is not accepted Boolean: – Assigning true or false to a statement or block
- 26. Static and Volatile Static : – A common memory allocation Volatile: – Share the value
- 27. Example for static and volatile Eg Program: Class samp { int a; Static int b; Volatile int c; } { Samp s1.new samp; Samp s2.new samp; Samp s3.new samp; }
- 28. Static memory allocation a=1 ,b=2 ,c=3 s1 s2 s3 a c b (b is declared as static so it is used in common) 1 0 0 3 3 3 2
- 29. Volatile memory allocation a=1 ,b=2 ,c=3 s1 s2 s3 a c (volatile value will be shared among the object) b 1 0 0 3 3 3 2
- 30. Java literals Integer literal: Eg: int a=10; int b=010; In integer literal if the first value is ‘0’ compiler will take that as octal value. Perform the operation and display the output Output: 8
- 31. int a=1; int b=2; int c=0x10; In integer literal if the first value is ‘0x’ compiler will take that as hexadecimal value. Perform the operation and display the output Output: 16
- 32. Character literals Declarations: Char c=’p’; Char c=98; Char c=‘n’; ”0 is not used in java” Char c=‘u0009’; (unicode)
- 33. Float literals Declaration: Float f=12.56f; Float f=12.; (‘f’ no need compiler will take that as 12.0) Bytes =4;Maximum digits =6 Double: double d=75.76835457786(maximum range is not defined)
- 34. String literals string s=“erode”; String s=“erobde”(o/p:erde(since /b is defined as backspace)) Eg: int a=10; int b=20; int c=30; string s=“hai”; s.o.p(“a+b+c+s”); s.o.p(“a+b+s+c”); s.o.p(“a+s+b+s”);
- 35. output 60hai 30hai30 10hai2030(still it finds the string it will add the content or numbers)
Editor's Notes
- #29: Last value stored in b will be taken as common valueIf b= 7 means the value will be changed as 7