我不断得到:
illegal start of expression,';" expected System.exit(0), and reached end of file while parsing
这是对其预期功能和代码的描述。
要解决的问题:
我应该在课外学习多少内容？
问题:
你的同学需要帮助。这是他们进入大学的第一年，他们需要确定需要学习多少小时才能取得好成绩。
Study Hrs Per Week Per Credit Grade
5: A,
4: B,
3: C,
2: D,
0: F,
项目规范:
- 用户输入他们计划学习的小时数 周或他们想要的成绩取决于他们的学分 进入。 (注意:您的程序必须为用户提供这两个选项。)
- 程序显示用户姓名、积分数、总积分 学习时数以及他们应该获得的成绩。
- 您可以使用简介中介绍的任何编程技术 编程逻辑类(class)来完成这个项目。那将 但是，要求您提前阅读教科书 有关如何在 Java 中实现该技术的说明 编程语言。
下面是我的代码:
import javax.swing.JOptionPane; //Needed for the dialogue box
/**
This program shows the student the grade they will receive
or how much to study for a certain grade.
*/
public class MoultonAlainaProject1
{
public static void main(String[] args)
{
string wantedGrade, desiredGrade, name, input;
char finalGrade;
int gradeA = 5;
int gradeB = 4;
int gradeC = 3;
int gradeD = 2;
int gradeF = 0;
float studyHrs;
int creditHrs, userChoice;
//Scanner for keyboard input
Scanner keyboard = new Scanner(System.in);
name = JOptionPane.showInputDialog("Please enter your name.");
input = JOptionPane.showInputDialog("How many credit hours do you plan on taking this semester?");
creditHrs = integer.parseInt(input);
input = JOption.showInputDialog("If you would like to know the amount of hours you should study for the amount of" +
"credit hours press 1. If you would like to know the grade you would receive by" +
"entering the amount of hours you plan to study press 2.");
userChoice = integer.parseInt(input);
if (userChoice == 1)
{
desiredGrade = JOptionPane.showInputDialog("Enter the grade you would like to receive.");
if (desiredGrade == 'A' || 'a')
{
wantedGrade = gradeA;
}
else
{
if (desiredGrade == 'B' ||'b')
{
wantedGrade = gradeB;
}
else
{
if (desiredGrade == 'C' || 'c')
{
wantedGrade = gradeC;
}
else
{
if (desiredGrade == 'D' || 'd')
{
wantedGrade = gradeD;
}
else
{
if (desiredGrade == 'F' || 'f')
{
wantedGrade = gradeF;
}
else
{
System.out.printIn("Error: you have not entered a valid input.");
}
}
}
}
}
studyHrs = wantedGrade * creditHrs;
}
else
{
if (userChoice == 2)
{
input = JOptionPane.showInputDialog("Enter the amount of hours you plan to study a week.");
studyHrs = integer.parseInt(input);
wantedGrade = studyHrs/creditHrs;
if (wantedGrade >= 5)
{
finalGrade = "A";
}
else
{
if (wantedGrade >= 4)
{
finalGrade = "B";
}
else
{
if (wantedGrade >= 3)
{
finalGrade = "C";
}
else
{
if (wantedGrade >= 2)
{
finalGrade = "D";
}
else
{
if (wantedGrade < 2)
{
finalGrade = "F";
}
}
}
}
}
JOptionPane.showMessageDialog(null, name+ ", you are taking " +creditHrs+ "credit hours, you should study " +studyHrs+ " hours a week to receive " +finalGrade+ " in your classes."
System.exit(0);
}
}
我已经检查过大括号很多次了，但我可能在某个地方漏掉了一些东西
最佳答案
您有大约 20 个编译时错误。
我看到缺少导入、用小写、未闭合括号编写的字符串，
未闭合的大括号、将字符串值分配给 char 变量等
请参阅下文并修复它们。
Description Resource Path Location Type
Type mismatch: cannot convert from String to char MoultonAlainaProject1.java /TEST/src line 107 Java Problem
Type mismatch: cannot convert from String to char MoultonAlainaProject1.java /TEST/src line 101 Java Problem
Type mismatch: cannot convert from String to char MoultonAlainaProject1.java /TEST/src line 95 Java Problem
Type mismatch: cannot convert from String to char MoultonAlainaProject1.java /TEST/src line 89 Java Problem
integer cannot be resolved MoultonAlainaProject1.java /TEST/src line 83 Java Problem
The method printIn(String) is undefined for the type PrintStream MoultonAlainaProject1.java /TEST/src line 69 Java Problem
integer cannot be resolved MoultonAlainaProject1.java /TEST/src line 33 Java Problem
JOption cannot be resolved MoultonAlainaProject1.java /TEST/src line 30 Java Problem
Syntax error, insert "}" to complete MethodBody MoultonAlainaProject1.java /TEST/src line 124 Java Problem
Syntax error on token(s), misplaced construct(s) MoultonAlainaProject1.java /TEST/src line 122 Java Problem
exit cannot be resolved or is not a field MoultonAlainaProject1.java /TEST/src line 122 Java Problem
Syntax error on token(s), misplaced construct(s) MoultonAlainaProject1.java /TEST/src line 120 Java Problem
Type mismatch: cannot convert from String to char MoultonAlainaProject1.java /TEST/src line 113 Java Problem
Syntax error, insert "}" to complete ClassBody MoultonAlainaProject1.java /TEST/src line 9 Java Problem
Scanner cannot be resolved to a type MoultonAlainaProject1.java /TEST/src line 23 Java Problem
string cannot be resolved to a type MoultonAlainaProject1.java /TEST/src line 12 Java Problem
integer cannot be resolved MoultonAlainaProject1.java /TEST/src line 28 Java Problem
Scanner cannot be resolved to a type MoultonAlainaProject1.java /TEST/src line 23 Java Problem
关于java - 错误表达式非法开始，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/21712604/