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[英]MySQL in Java - INSERT and DELETE statements not working properly
[英]Java IF statements not working properly
我的if語句存在一些問題。 錯誤顯示此問題您能幫我找出問題所在嗎? 汽車保險公司的主要任務是根據申請人的年齡和性別將保險分為4類。
這是代碼:
String gender, age;
char group;
int genderint, ageint;
gender = JOptionPane.showInputDialog("Please specify your gender(1 for male, 0 for female)");
age = JOptionPane.showInputDialog("Please enter your age");
genderint = Integer.parseInt(gender);
ageint = Integer.parseInt(age);
if (gender = 0 || 1 && age = > 18 && < 26) {
group = "Category A";
} else if (gender = 0 && age = > 27 && < 60) {
group = "Category B";
} else if (gender = 1 && age = > 27 && < 60) {
group = "Category C";
} else if (gender = 0 || 1 && age = > 60) {
group = "Category D";
} else if (gender = 0 || 1 && age = < 18) {
JOptionPane.showMessageDialog(null, "Sorry, you're too young");
}
JOptionPane.showMessageDialog(null, "You have been assignet to" + group);
}
}
嘗試這個,
==
進行比較 <=
和>=
之間沒有空格 or
條件 <=
不是=<
,使用>=
代替=>
使用genderint
和ageint
變量INT比較
if ((genderint == 0 || genderint ==1) && (ageint >=18 && ageint < 26)) { group = "Category A"; } else if(genderint == 0 && ageint >= 27 && ageint < 60){ group = "Category B"; } else if(genderint == 1 && ageint >= 27 && ageint < 60) { group = "Category C"; } else if((genderint == 0 || genderint == 1) && ageint >= 60) { group = "Category D"; } else if((genderint == 0 || genderint ==1) && ageint <18){ JOptionPane.showMessageDialog(null,"Sorry, you're too young"); }
首先是...
>=
替換= >
,用<=
替換= >
=<
,用==
替換= >
=
(比較性別時)。 string
而在Java字符串中.equals()
進行比較,而不是以'=='進行比較。 您那里有幾個問題:
= <
運算符被寫入<=
(無空格, =
在<
之后); = >
(即>=
) gender = 0 || 1
gender = 0 || 1
必須為genderint == 0 || genderint == 1
genderint == 0 || genderint == 1
age = >27 && <60
應該是age >= 27 && age < 60
首先,你應該使用genderint
和ageint
在你的條件。
其次,您似乎正在發明一些不存在的運算符:
gender = 0 || 1
gender = 0 || 1
應該是(genderint == 0 || genderint == 1)
-比較需要==
age = >18 && <26
應該為ageint >= 18 && ageint < 26
大於或等於>=
//gender is string
if ((gender.equals("0") || gender.equals("1")) && (ageint >= 18 && ageint < 26))
{
//group is string
group = "Category A";
}
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