public class Garde{
public static void main(String[] args) {
int testscore = DialogBox.requestInt("Please input a int number: ");
char grade;
if (testscore >= 90) {
grade = 'A';
} else if (testscore >= 80) {
grade = 'B';
} else if (testscore >= 70) {
grade = 'C';
} else if (testscore >= 60) {
grade = 'D';
} else {
grade = 'F';
}
Transcript.println("Grade = " + grade);
}
}编译时出现2个错误:1. cannot resolve symbol
symbol:variable DialogBox
location:class Garde int testscore = DialogBox.requestInt("Please input a int number: ");
2. cannot resolve symbol
symbol:variable Transcript
location:class Garde Transcript.println("Grade = " + grade); 这2个错误是什么错误哦?为什么会产生这个错误?
是不是因为没有写 import 引入类包的原因?
public static void main(String[] args) {
int testscore = DialogBox.requestInt("Please input a int number: ");
char grade;
if (testscore >= 90) {
grade = 'A';
} else if (testscore >= 80) {
grade = 'B';
} else if (testscore >= 70) {
grade = 'C';
} else if (testscore >= 60) {
grade = 'D';
} else {
grade = 'F';
}
Transcript.println("Grade = " + grade);
}
}编译时出现2个错误:1. cannot resolve symbol
symbol:variable DialogBox
location:class Garde int testscore = DialogBox.requestInt("Please input a int number: ");
2. cannot resolve symbol
symbol:variable Transcript
location:class Garde Transcript.println("Grade = " + grade); 这2个错误是什么错误哦?为什么会产生这个错误?
是不是因为没有写 import 引入类包的原因?
1.如何知道这个类是否是系统的类包,还是自己定义的类包?用JAVA API ?
2.为什么 在helloword中 system.out.println ,system是系统类包吧?为什么没有写import语句也能编译?
2这个问题看看书吧,我也是新手,解释不好