我正在编写一个java应用程序，它有创建契约的用户。合同中有可添加到合同中的支持用户列表。创建此合同的用户不在支持者列表中。支持用户可以帮助用户的初始创建者执行合同，例如“60天内不喝酒”。我有一个函数可以在user类中显示合同列表。我还可以将用户添加到合同中的列表中。在编写viewsupportedcontracts（）函数时，我应该如何在以后考虑最佳内存问题？我将在主类中使用user对象。

package core;

import java.util.ArrayList;
import java.util.List;

public class Contract {
    private boolean termsAndAgreementSigned = false;
    private List<User> supporters = new ArrayList<User>();

    public Contract()
    {

    }

    public void setTermsAndAgreementSigned(boolean termsAndAgreementSigned) {
        this.termsAndAgreementSigned = termsAndAgreementSigned;
    }

    public boolean isTermsAndAgreementSigned() {
        return termsAndAgreementSigned;
    }

    public void addSupporter(User user)
    {
        supporters.add(user);
    }

    public void viewSupporters()
    {
        System.out.println("These are the supporters");
    }

}

package core;

import java.util.ArrayList;
import java.util.List;

public class User {
    private List<Contract> contracts = new ArrayList<Contract>();

    public User()
    {

    }

    public void addContract(Contract contract) throws Exception {
        if(contract.isTermsAndAgreementSigned() == true)
            contracts.add(contract);
    }

    public List<Contract> getContracts() throws Exception {
        return contracts;
    }

    public void viewSupportedContracts() {
        // TODO Auto-generated method stub

    }

}