Apex Fundamentals
Primitive Data Type
String greeting = 'Hello World';
System.debug(greeting);
Boolean amIAwake = true;
System.debug(amIAwake);
Integer rollNumber = 11008890;
System.debug(rollNumber);
Long worldPopulation = 7000000000L;
System.debug(worldPopulation);
Double lightSpeed = 93000000/186000;
System.debug(lightSpeed);
Date tDay = Date.newInstance(2020, 5, 18);
System.debug(tDay);
Time currentTime = Time.newInstance(3, 25, 0, 0);
System.debug(currentTime);
DateTime currentDateTime = DateTime.newInstance(2020, 5, 18, 3, 25, 0);
System.debug(currentDateTime);
//All null values
String greeting;
System.debug(greeting);
Boolean amIAwake;
System.debug(amIAwake);
Integer rollNumber;
System.debug(rollNumber);
Long worldPopulation;
System.debug(worldPopulation);
Double lightSpeed;
System.debug(lightSpeed);
Date tDay;
System.debug(tDay);
Time currentTime;
System.debug(currentTime);
DateTime currentDateTime;
System.debug(currentDateTime);
String Class Methods
String str = ' i am a string variable ';
System.debug('Actual String: '+str);
// capitalize string
System.debug('Capitalize String: '+str.capitalize());
// contains example
System.debug('Contains ring? :'+ str.contains('ring'));
// convert to upper case
System.debug('Upper case: '+str.toUpperCase());
// convert to lower case
System.debug('Lower case: '+str.toLowerCase());
// equals
System.debug('Is equal to ring?: '+str.equals('ring'));
String str1 = 'Manish';
String str2 = 'maNish';
System.debug('str1 equals str2: '+str1.equals(str2));
System.debug('str1 equals str2 ignore case: '+str1.toLowerCase().equals(str2.toLowerCase()));
// remove
System.debug('Remove ring: '+str.remove('ring'));
// replace
System.debug('Replace ring: '+str.replace('ring', 'rong'));
// split
System.debug('Split by space: '+str.split(' '));
