Java 集合遍历

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Java List集合遍历的几种方式

1.for循环遍历

//在这里新建一个List集合
List<Teacher> teacherLists = new ArrayList<Teacher>();
//然后遍历集合
for (int i = 0; i < teacherList.size(); i++){
    Teacher teacher = teacherList.get(i);
    if (teacher != null){
        teacherLists.add(teacher);
        }
    model.addAttribute("teacherList",teacherLists);
}

2.for循环(迭代器)

for (Iterator iterators = teacherList.iterator();iterators.hasNext();){
    Teacher teacher = (Teacher) iterators.next();
    String tname = teacher.getName();
    model.addAttribute("teacherList",tname);
}

3.for循环(数组)

for (int i=0; i < teacherList.size(); i++){
    String[] arr = new String[teacherList.size()];
    for (int j = 0; j < teacherList.size(); j++){
        arr[i] = teacherList.get(j).getName();
        model.addAttribute("teacherList",arr[i]);
    }
    //model.addAttribute("teacherList",teacherList.get(i));
}
//model.addAttribute("teacherList",teacherList);

4.F-E

在前端输出的时候，如果输出的是List集合，那么输出之后，还需要转换成具体的输出，比如：teacherList.getName()，teacherList.getOffice等。然后在之前加上<#list>标签能遍历所有的元素。

<#list teacherList as teacher>
    <tr>
        <td>${teacher.getStaffno()}</td>
        <td>${teacher.getName()}</td>
        <td>${teacher.getOffice()}</td>
    </tr>
</#list>

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