運行以下方法時，我沒有得到任何返回?？偸潜唤K止而沒有任何結果。有人可以告訴我為什么我沒有得到任何結果嗎？我根據評論進行了調整，但沒有成功。我在下面添加了主要方法；public class ModuleGrader {final int examID = 123;String excellent =null;String good=null;String satisfactory=null;String compensatableFail=null;String outrightFail=null;int grade;public String gradeModule(int mark) { String result = null; if (mark>=70 && mark<=100) { result = excellent; System.out.println(" "); } else if (mark>=60 && mark<=69) { result = good; } else if (mark>=50 && mark<=59) { result = satisfactory; } else if (mark>=40 && mark<=49) { result = compensatableFail; } else if (mark>=0 && mark<=39) { result = outrightFail; } else { System.out.println("Invalid entery, please insert an number between 100-0"); } return result;}所以我添加了我的調用 main 方法；調用的方法可能是問題所在？public static void main(String[] args) { ModuleGrader mg=new ModuleGrader(); mg.gradeModule(100); mg.gradeModule(66);}
2 回答
狐的傳說
TA貢獻1804條經驗 獲得超3個贊
String excellent;您沒有為,分配任何值String good;，因此它會失敗，因為在調用它們時這些值尚未初始化為任何值。
你怎么知道它不起作用？您沒有將最終結果輸出到控制臺。我添加了
System.out.println()糾正這一點。你不能從靜態的東西引用非靜態的東西。更改
public class ModuleGrader為public static class ModuleGrader.
最終工作代碼
public class Main {
public static void main(String[] args) {
ModuleGrader mg=new ModuleGrader();
System.out.println(mg.gradeModule(100));
System.out.println(mg.gradeModule(66));
}
public static class ModuleGrader {
final int examID = 123;
String excellent = null;
String good = null;
String satisfactory = null;
String compensatableFail = null;
String outrightFail = null;
int grade;
public String gradeModule(int mark) {
String result = null;
if (mark >= 70 && mark <= 100) {
result = excellent;
System.out.println(" ");
} else if (mark >= 60 && mark <= 69) {
result = good;
} else if (mark >= 50 && mark <= 59) {
result = satisfactory;
} else if (mark >= 40 && mark <= 49) {
result = compensatableFail;
} else if (mark >= 0 && mark <= 39) {
result = outrightFail;
} else {
System.out.println("Invalid entery, please insert an number between 100-0");
}
return result;
}
}
}
RISEBY
TA貢獻1856條經驗 獲得超5個贊
public class ModuleGrader {
final int examID = 123;
//String excellent=null;
//String good=null;
//String satisfactory=null;
//String compensatableFail=null;
//String outrightFail=null;
int grade;
public String gradeModule(int mark) {
String result = null;
if (mark>=70 && mark<=100)
{
result = "excellent";
System.out.println(" ");
}
else if (mark>=60 && mark<=69)
{
result = "good";
}
else if (mark>=50 && mark<=59)
{
result = "satisfactory";
}
else if (mark>=40 && mark<=49)
{
result = "compensatableFail";
}
else if (mark>=0 && mark<=39) {
result = "outrightFail";
}
else {
System.out.println("Invalid entery, please insert an number between 100-0");
}
return result;
}
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