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SELECT
TYPEOF What
WHEN Account THEN Phone, NumberOfEmployees
WHEN Opportunity THEN Amount, CloseDate
WHEN Campaign THEN ExpectedRevenue, StartDate
ELSE Name
END
FROM Event

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The equals method with this signature:
public Boolean equals(Object obj) {
// Your implementation
}

Keep in mind the following when implementing the equals method. Assuming x, y, and z are non-null instances of your
class, the equals method must be:
◊ Reflexive: x.equals(x)
◊ Symmetric: x.equals(y) should return true if and only if y.equals(x) returns true
◊ Transitive: if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true

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public class PairNumbers {
Integer x,y;
public PairNumbers(Integer a, Integer b) {
x=a;
y=b;
}
public Boolean equals(Object obj) {
if (obj instanceof PairNumbers) {
PairNumbers p = (PairNumbers)obj;
return ((x==p.x) && (y==p.y));

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Map<PairNumbers, String> m = new Map<PairNumbers, String>();
PairNumbers p1 = new PairNumbers(1,2);
PairNumbers p2 = new PairNumbers(3,4);
// Duplicate key
PairNumbers p3 = new PairNumbers(1,2);
m.put(p1, 'first');
153
Developer Console Enhancements Apex Code Enhancements
m.put(p2, 'second');
m.put(p3, 'third');

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public class MyDynamicSolution {
@future
public static void updateOwner(List<ID> objIds, ID newOwnerId) {
// Validate input
System.assert(objIds != null);
System.assert(objIds.size() > 0);
System.assert(newOwnerId != null);
// Get the sObject token from the first ID
// (the List contains IDs of sObjects of the same type).
Schema.SObjectType token = objIds[0].getSObjectType();

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//TODO: This class will stop allowing trigger to fire-in twice 

public class ControlledTriggerHelper {

	// initialize a variable to hold state	
	private static boolean alreadyModified = false;
	
	// get the state
        public static boolean isAlreadyModified() {
        return alreadyModified;

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   if ( Trigger.isAfter )
    {
    	System.debug('in after trigger; alreadyModified: ' + ControlledTriggerHelper.isAlreadyModified());
    	if (!ControlledTriggerHelper.isAlreadyModified() ) 
        {
		ControlledTriggerHelper.setAlreadyModified();
  		// do something...
        }
    }

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 if (!RecursiveTriggerHelper.isAlreadyModified() ) 
			{
				RecursiveTriggerHelper.setAlreadyModified();
				myclass.CheckOwnerChange(oldOpportunity,NewOpportunity);
			}   
      	}

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trigger OpportunityTrigger on Opportunity (before Update, after Update)
{
  //Poor Design
  for (Account acc : Trigger.New)
    {
      //Creating instance of class for each trigger call
      OpportunityRecordType art = new OpportunityRecordType() 
      ......
    }
 

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trigger OpportunityTrigger on Opportunity(before Update, after Update) {
    
    for (Account acc: Trigger.New) {
        
       //Creating instance of class for each trigger call
        OpportunityRecordType art = OpportunityRecordType.getInstance();
            ......
    }

}