[英]Java printing Arraylist
這是我的2個班級,它們起作用。 我想將Member添加到Lan
的ArrayList
中。 我的問題是,我似乎無法打印出Lan
的ArrayList
中設置的成員,名稱和別名或僅名稱。 當我打印此文件時:Member @ 1279d2f,有什么想法嗎? :S
import java.util.ArrayList;
public class Lan
{
private ArrayList<Member> members;
public Lan()
{
members = new ArrayList<Member>();
}
public void addMember(Member newMember)
{
if(newMember.getBalance() >= 200)
{
this.members.add(newMember);
}
else
{
System.out.println("You dont have enough money to enter");
}
}
public void printMembers(){
System.out.println("People attending");
for(Member member : members){
System.out.println(member);
}
}
}
public class Member
{
private String name;
private String alias;
private int balance;
public Member(String fullName, String nickname)
{
this.name = fullName;
this.alias = nickname;
this.balance = 0;
}
public void setBalance(int account)
{
if(account > 0)
{
balance = balance + account;
}
else
{
System.out.println("You have not entered a valid number");
}
}
public String getName()
{
return name;
}
public String getAlias()
{
return alias;
}
public int getBalance()
{
return balance;
}
}
您必須為會員類定義toString()
方法:
public class Member {
private String name;
private String alias;
private int balance;
public Member(String fullName, String nickname)
{
this.name = fullName;
this.alias = nickname;
this.balance = 0;
}
public void setBalance(int account)
{
if(account > 0)
{
balance = balance + account;
}
else
{
System.out.println("You have not entered a valid number");
}
}
public String getName()
{
return name;
}
public String getAlias()
{
return alias;
}
public int getBalance()
{
return balance;
}
@Override
public String toString() {
return this.name + "\t" + this.balance;
}
}
如果沒有自定義類的toString()
方法,則將其在內存中的位置打印出來。 如果您要在“會員”中打印其他信息,請修改我為您提供的方法。
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