Simple Java Program-Some important points üpublic: Access specifier. main() must be made public, since it  must be called by code defined outside it’s class. üStatic: It is required because main() is called without creating  an object...

Language of Internet Programming Java Applets Security Portability 1. Applets: Special java program that can transmitted over the network and  automatically executed by a java-compatible web browser. 2. Security: Java compatible...

History of Java 1. Java is a general purpose object oriented programming  language. 2. Developed by Sun Microsystems. (James Gostling) 3. Initially called “Oak” but was renamed as “Java” in 1995. 4. Initial motivation is to develop a pl...

Java Converting Epoch Seconds to DMYHMS Problem You need to convert a number of seconds since 1970 into a Date . Solution Just use the Date constructor. Explained “The Epoch” is the beginning of time as far as modern operating systems go....

Java Parsing Strings into Dates Problem You need to convert user input into Date or Calendar objects. Solution Use a DateFormat . Explained The DateFormat class introduced in Recipe 6.2 has some additional methods, notably parse( ) , whic...

Java Converting YMDHMS to a Calendar or Epoch Seconds Problem You have year, month, day, hour, minute, and maybe even seconds, and you need to convert it to a Calendar or a Date . Solution Use the Calendar class’s set(y,m,d,h,m[,s]) metho...