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[英]Printing an Arraylist in toString with new lines separating each entry
[英]Printing an Arraylist in toString with lines separating each entry
我有一个toString,需要打印很多东西,包括一个包含多个条目的Arraylist。 这些条目必须用新行分隔。 这是我现在正在使用的toString代码:
@Override
public String toString() // Displays the info for a class
{
return getCourseId() + "\n" + getCourseName() + "\n" + getCourseCode()
+ "\n" + "\n" + "Instructor" + "\n" + "-------------------------"
+ "\n" + Instructor.toString() + "\n" + "\n" + "Student Roster"
+ "\n" + "-------------------------" + "\n" + roster;
}
名册确实会打印,但是所有条目都在同一行中,并带有方括号和逗号。
我的老师坚持说toString必须是独立的,所以我在toString中拥有的所有内容目前都必须呆在那里。
名册打印如下:
@Override
public String toString() // Displays the info for a person in order
{
return getPersonId() + "\t" + getLastName() + "\t" + getFirstName()
+ "\t" + getMajor() + "\t" + getGpa();
}
当前,我得到的输出看起来像这样:
10000
College Algebra
MATH 101
Instructor
-------------------------
X00009876 Jones Jane Associate Professor Mathematics
Student Roster
-------------------------
[X00000002 Smith Sally History 2.98, X00000003 Adams Amanda Civil Engineering 3.7, X00000005 Turner Thomas Nursing 2.34]
但我希望它看起来像这样:
10000
College Algebra
MATH 101
Instructor
-------------------------
X00009876 Jones Jane Associate Professor Mathematics
Student Roster
-------------------------
X00000002 Smith Sally History 2.98
X00000003 Adams Amanda Civil Engineering 3.7
X00000005 Turner Thomas Nursing 2.34
任何建议将不胜感激。 谢谢!
尝试这个:
String rosterStr = roster.stream()
.map(r -> r.toString())
.collect(Collectors.joining("\n"))
它将获取花名册中每个值的字符串,然后将它们与换行符连接
我不确定您要问的是什么,但是我建议使用StringBuilder类,如下所示:
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
//You haven't provided much info about your ArrayList, customise this accordingly
for (Object o : ArrayList<Object>) {
sb.append(o.toString() + " ");
}
sb.setLength(sb.length() - 1);
return getCourseId() + "\n" + getCourseName() + "\n" + getCourseCode()
+ "\n" + "\n" + "Instructor" + "\n" + "-------------------------"
+ "\n" + Instructor.toString() + "\n" + "\n" + "Student Roster"
+ "\n" + "-------------------------" + "\n" + sb.toString();
}
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