长期在Java中被视为数组中的int

Question

我已经将变量定义为long，当我尝试将其用作数组中的一个变量时，它会继续抛出一个错误，说我的值超出了int范围。 嗯，不开玩笑，这很长，我把它定义为一个。

以下是我的代码。 在第二课，LoanOfficer，你会发现第二个申请人比尔盖茨，其年收入为3,710,000,000，这就是错误。

public class Applicant {
    private String name;
    private int creditScore;
    private long annualIncome;
    private int downPayment;
    private boolean status;

    public Applicant(String name, int creditScore, long annualIncome,
            int downPayment) {
        this.name = name;
        this.creditScore = creditScore;
        this.annualIncome = annualIncome;
        this.downPayment = downPayment;
        this.status = false;
    }

    public String getName() {
        return name;
    }

    public int getCreditScore() {
        return creditScore;
    }

    public long getAnnualIncome() {
        return annualIncome;
    }

    public int getDownPayment() {
        return downPayment;
    }

    public void setStatus(boolean status) {
        this.status = status;
    }

    public boolean isStatus() {
        return status;
    }
}

public class LoanOfficer {
    public static void main(String[] args) {
        Applicant[] applicants = {
                new Applicant("MC Hammer", 400, 25000, 5000),
                new Applicant("Bill Gates", 850, 3710000000, 500000),
                new Applicant("MC Hammer", 400, 25000, 5000),
                new Applicant("MC Hammer", 400, 25000, 5000), };
    }
}

Answer 1

对于被视为long的数字，您需要L后缀：

new Applicant("Bill Gates", 850, 3710000000L, 500000)

如果缺少L后缀，编译器会将文字视为int 。

Answer 2

您需要通过附加L指定3710000000作为长文字：

new Applicant("Bill Gates", 850, 3710000000L, 500000),

来自JLS

如果整数文字后缀为ASCII字母L或l（ell），则整数文字的长度为long; 否则它是int类型

Answer 3

将3710000000更改为3710000000L。 问题是没有L ，Java会把它当作int 。