gistfile1.java

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');
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m.put(p2, 'second');
m.put(p3, 'third');
// Map size is 2 because the entry with
// the duplicate key overwrote the first entry.
System.assertEquals(2, m.size());
// Use the == operator
if (p1 == p3) {
System.debug('p1 and p3 are equal.');
}
// Perform some other operations
System.assertEquals(true, m.containsKey(p1));
System.assertEquals(true, m.containsKey(p2));
System.assertEquals(false, m.containsKey(new PairNumbers(5,6)));
for(PairNumbers pn : m.keySet()) {
System.debug('Key: ' + pn);
}
List<String> mValues = m.values();
System.debug('m.values: ' + mValues);
// Create a set
Set<PairNumbers> s1 = new Set<PairNumbers>();
s1.add(p1);
s1.add(p2);
s1.add(p3);
// Verify that we have only two elements
// since the p3 is equal to p1.
System.assertEquals(2, s1.size());