primefaces selectOneMenu没有排序

Question

我有一个selectonemenu在我的页面，我从我的支持bean获取它的内容。但是selectOneMenu用于内容不sorted.Here是代码... selectOneMenu用于的

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和我的豆...

public class SearchBean implements Serializable { 

private Map<String, Map<String, String>> courseData = new HashMap<String, Map<String, String>>(); 

private Map<String, String> departments = new HashMap<String, String>(); 
private String selectedDepartment; 


    departments.put("department1", 
      "department1"); 
    departments.put("department2", 
      "department2"); 
    departments.put("department3", "department3"); 
departments.put("department4", "department4"); 
departments.put("department5", "department5"); 





//getters setters... 


} 

和内容不department1，department2，department3，department4，department5它没有排序。

Answer 1

它没有排序，因为HashMap没有可预测的迭代顺序。改为尝试LinkedHashMap。

Answer 2

与LinkedHashMap的又下令不排序，即你在你把项目为了得到它，但如果你使用TreeMap的然后按字母顺序sorteted