58、salesforce学习笔记（五）

Set集合

Set<String> set1 = new Set<String>();set1.add('1');set1.add('2');Set<String> set2 = set1.clone();Boolean isEquals = set1.equals(set2);Boolean isContains = set1.contains('1');Integer setSize = set1.size();Iterator<String> Iterator2 = set1.iterator();while(iterator2.hasNext()){    System.debug('set item:'+ iterator2.next());}Boolean isEmpty = set1.isEmpty();List<String> anotherList = new String[]{'1','3'};set1.retainAll(anotherList);Iterator<String> iterator3 = set1.iterator();while(iterator3.hasNext()){    System.debug('set item via retainAll:'+iterator3.next());}