Set<String>{'A', 'B', 'C'}; Map<String, String> strMap = new Map<String, String>{'A' => 'a', 'B' => 'b', 'C' => 'c', 'D' => 'd', 'E' => 'e'}; // strMapのキーをループで回す for(String s : strMap.keyset()){ System.
Map<String, String> testMap; System.debug(testMap.isEmpty()); List<String> testList; System.debug(testMap.isEmpty()); 此时会报错System.NullPointerException: Attempt to de-reference a null object Map<String, String> testMap; System.debug(testMap == null); List<String> testList; System....
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Map<String, String> testMap; System.debug(testMap.isEmpty()); List<String> testList; System.debug(testMap.isEmpty()); 此时会报错System.NullPointerException: Attempt to de-reference a null object Map<String, String> testMap; System.debug(testMap == null); List<String> testList; System....
public Set<Integer> getControlIndexes(String validFor){ if(mapValidForIndexes.containsKey(validFor)) return mapValidForIndexes.get(validFor); // 将validfor从Base64转化成16进制格式 // 对,也就是说,validfor是Base64格式的数据 // 而官方只提供了转化成16进制格式的方法(convertToHex),这样才将valid...
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It has JDK-compatible List, Set and Map implementations with a rich API, additional types not found in the JDK like Bags, Multimaps and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings. The iteration protocol was inspired by the Smalltalk collection...
Can I import a list of names into forms , so that a person filing out a form can select a name from that list...