大于或等于总是触发

Question

下面是有问题的代码：

public void setReminder() {
    if (db.getTotalIncome(prefs.getString("username", "")) != 0.0 ||
        db.getTotalExpenses(prefs.getString("username", "")) != 0.0 ||
        db.getReminder(prefs.getString("username", "")) != null) {

        Float income = db.getTotalIncome(prefs.getString("username", ""));
        Float expense = db.getTotalExpenses(prefs.getString("username", ""));
        Cursor reminder = db.getReminder(prefs.getString("username", ""));
        if (reminder.moveToFirst() != false) {
            String reminderValue = reminder.getString(reminder.getColumnIndex("value"));
            if (expense <= Integer.parseInt(reminderValue)/100*income) {
                PugNotification.with(this)
                    .load()
                    .title("Warning")
                    .message("Expenses nearing threshold")
                    .bigTextStyle("You have spent more than " + Integer.parseInt(reminderValue) / 100 + "% " + "of your income!")
                    .smallIcon(R.drawable.icon_flag)
                    .largeIcon(R.drawable.icon_flag)
                    .flags(Notification.DEFAULT_ALL)
                    .simple()
                    .build();
                }
            }
        }
    }

目前，在if（费用

if (db.getTotalIncome(prefs.getString("username", "")) != 0.0 ||
    db.getTotalExpenses(prefs.getString("username", "")) != 0.0 ||
    db.getReminder(prefs.getString("username", "")) != null) 

也总是返回true。我读到float的默认值是0.0，那么我的代码是错的还是怎么了？




Answer 1

试用

expense.intValue() <= Integer.parseInt(reminderValue)/100*income

与您的其他if语句相同：

if (db.getTotalIncome(prefs.getString("username", "")).intValue() != 0 ||
                db.getTotalExpenses(prefs.getString("username", "")).intValue() != 0 ||
                db.getReminder(prefs.getString("username", "")) != null) 

欲了解更多信息，请阅读以下答案：https://stackoverflow.com/a/29139595/284308

Answer 2

您的代码：

    if (db.getTotalIncome(prefs.getString("username", "")) != 0.0 ||
            db.getTotalExpenses(prefs.getString("username", "")) != 0.0 ||
            db.getReminder(prefs.getString("username", "")) != null)

if中的表达式始终为true，因为您使用的是|，意思是或，因此如果任何参数为true，则整个表达式为true。在您的情况下，至少有一个参数是true。