java - 当我尝试从 selectManyCheckbox 检索选中的项目时， while 循环到无穷大

Question

我想从复选框中恢复选中的项目列表，当我迭代列表以检索项目时，问题是检查指令 while 循环到无限这是我的代码:

JSF:

  <h:selectManyCheckbox value="#{TestAjax.selectedItemscheckbox}">
<f:selectItem itemValue="priority.pname" itemLabel="By priority" />
<f:selectItem itemValue="project.pname" itemLabel="By project" />    
</h:selectManyCheckbox>

代码:

public Class TestAjax {

private ArrayList<String> selectedItemscheckbox;  //list of checkbox used for grouping


public ArrayList<String> getSelectedItemscheckbox() {
    return selectedItemscheckbox;
}

public void setSelectedItemscheckbox(ArrayList<String> selectedItemscheckbox) {
    this.selectedItemscheckbox = selectedItemscheckbox;
}


public void CreateQueryNumber()
{ 
 Iterator it= selectedItemscheckbox.iterator();
 System.out.println("checkeddddddddddd"+selectedItemscheckbox);

 while(it.hasNext())  ===>loop to the  infinity
 {
   System.out.println("one"+ it.toString());
 select ="select count(jiraissue.id) as nb";
 from ="jiraissue j ,priority pr ,project proj";
 where="j.project=proj.id";
 jointure="j.priority =pr.id";
 groupBy="group by "+it.toString();

}

}

Answer 1

您没有对 it.next() 进行任何调用。要解决此问题，您可以在循环末尾添加 it.next() :

  while(it.hasNext()){
       .... bla bla bla ....
       it.next();
  }

或者使用类似的东西:

  Object obj;
  while((obj = it.next()) != null){
       .... bla bla bla ....
  }