class Applicant
{
String applicantName;
String applicantAddress;
String applicantPosition;

public void displayDetails()
{
System.out.println(applicantName);
System.out.println(applicantAddress);
System.out.println(applicantPosition);
}
}

public class ApplicantCollection
{
Applicant appObjects[];

public void ApplicantCollection()
{
appObjects =new Applicant[3];

for (int ctr=0;ctr!=appObjects.length;ctr++)
{
appObjects[ctr]=new Applicant();
}
appObjects[0].applicantName="Tom";
appObjects[0].applicantAddress="1 Park Avenue";
appObjects[0].applicantPosition="Manager";

appObjects[1].applicantName="Jim";
appObjects[1].applicantAddress="21 Bakers St";
appObjects[1].applicantPosition="Executive";

appObjects[2].applicantName="Peter";
appObjects[2].applicantAddress="63 Brown Stone";
appObjects[2].applicantPosition="Associate";

}
 
    public void displayCollection()
{
for (int ctr=0;ctr!=appObjects.length;ctr++)
{
appObjects[ctr].displayDetails();
     }
}

public static void main(String args[])
{
ApplicantCollection collectionObject;
collectionObject=new ApplicantCollection();
collectionObject.displayCollection();
}
}

javac可以通过，但是java有错，帮忙看看

你的构造函数写错了，那个不是构造函数，不应该有返回值！你把那个void去掉就可以了！

去掉public void ApplicantCollection()的void，构造是没有返回值的。没调用到构造！

public void ApplicantCollection()
应为pubic ApplicantCollection()

哈哈，真是大意失荆洲！ ：） 加油！