java - 使用循环显示特定的 arraylist 对象

Question

所以我需要显示数组列表中整数值超过 7 的某些元素。到目前为止，我已经写了这个，但我正在努力使其工作。有人可以帮忙吗？

public Diary()
{
    jobname = new ArrayList<Job>();
}


public void priority ()
{
    int index = 0;
    while (index < jobname.size ()) {
        Job jobName = jobname.get (index);
        index ++;
        //if (jobname.get (priority)) {
        //    System.out.println (jobname);
        //}
    }
}

这是日记引用的 Job 类。

public Job(String job, int priorityNum, String day) 
{
    if (priority < 0 || priority > 10) {
        priority = 0;
    }
    else {
        priority = priorityNum;
    }
    jobname = job;
    dueDay = day;
}

public boolean isUrgent()
{
    return priority > 7;
}


public String toString ()
{
   String s = "";
   s += "Job = " + jobname + " \n";
   s += "Day Due = " + dueDay + " \n";
   s += "Priority = " + priority + " \n";

   return s;
}

Answer 1

您需要将代码更改为以下内容:

public void priority ()
{
    foreach(Job job : jobname){
        if (job.getPriority() > 7) {
            System.out.println (job);
        }
    }
}

其次，在 Job 类中添加 getPriority()，该类将返回 priority 的值:

public String getPriority(){
    return this.priority; 
}