我有一个名为setLevel
的方法/**
* Sets the level of this course.
*
* @param newLevel - one of the enumerated levels
*/
public void setLevel(char newLevel)
{
if(newLevel == 7 || newLevel == 1 || newLevel == 9 || newLevel == 8)
{
level = newLevel;
}
else
{
level = DEFAULT_LEVEL;
}
} // end of method setLevel(char newLevel)
当我使用这种方法时，我设置了Level 我有另一种叫做getLevel的方法
/**
* Returns the level of this course.
*
* @return the level of this course
*/
public char getLevel()
{
return level;
} // end of method getLevel()
但是当我调用此方法时，它会显示我设置的默认级别。
关于如何修复它的任何想法
这是完整的代码
public class Course extends Object implements Serializable
{
// instance variables
private int academicYear;
private String code;
private static int counter = 0;
private char level;
private String name;
private int serialNumber;
// class constants
private static final String DATA_FILE = "courses.data";
public static final String DEFAULT_CODE = "Introduction to Computer Science";
public static final char DEFAULT_LEVEL = 7;
public static final String DEFAULT_NAME = "ICS3U";
public static final int DEFAULT_YEAR = 2014;
private static final int ERROR_CLASS_NOT_FOUND_EXCEPTION = -1;
private static final int ERROR_EOF_EXCEPTION = -2;
private static final int ERROR_IO_EXCEPTION = -3;
final char[] LEVEL = {'7', '1', '9', '8'};
/**
* Constructor for objects of class Course
*/
public Course()
{
name = DEFAULT_NAME;
code = DEFAULT_CODE;
level = DEFAULT_LEVEL;
academicYear = DEFAULT_YEAR;
serialNumber = ++counter;
} // end of constructor Course()
public Course(String name, String code, char level, int academicYear)
{
this.name = name;
this.code = code;
if (level == 7 || level == 1 || level == 9 || level == 8)
{
level = level;
}
else
{
level = DEFAULT_LEVEL;
}
if (academicYear > 1900 && academicYear < 2014)
{
this.academicYear = academicYear;
}
else
{
academicYear = DEFAULT_YEAR;
}
} // end of constructor Course(String name, String code, char level, int academicYear)
/**
* Indicates whether another object has a state identical to this object’s state.
*
* @param otherCourse - the object whose state is compared to this object’s
*/
public boolean equals(Object otherCourse)
{
if (otherCourse == null) return false;
if (this.getClass() != otherCourse.getClass()) return false;
if (this == otherCourse) return true;
if(this != otherCourse) return false;
// needed to satisfy the compiler
return true;
} // end of method boolean equals(Object course)
/**
* Compares this Course to another.
*/
public int compareTo(Course otherCourse)
{
int before = -1;
int after = 1;
int equals = 0;
int resultCode = code.compareTo(otherCourse.getCode());
if(otherCourse == null) return before ;
if(serialNumber < otherCourse.getSerialNumber()) return before;
if(serialNumber > otherCourse.getSerialNumber()) return after;
if(code.compareTo(otherCourse.getCode()) != 0) return resultCode;
if(!(sortLevel(level) == -1 || sortLevel(otherCourse.getLevel()) == -1))
{
if(sortLevel(level) < sortLevel(otherCourse.getLevel())) return -1;
if(sortLevel(level) > sortLevel(otherCourse.getLevel())) return 1;
}
return 1;
}
private static int sortLevel(char level)
{
final char[] LEVEL = {'7', '1', '9', '8'};
for (int index = 0; index < LEVEL.length; index++)
{
if(LEVEL[index] == level) return index;
if(LEVEL[index] == level) return DEFAULT_LEVEL;
}
// error code for not found, should not be reached
return -1;
}
/* accessors*/
/**
* Returns the code of this course.
*
* @returns Returns the code of this course
*/
public String getCode()
{
return code;
} // end of method getCode()
/**
* Returns the level of this course.
*
* @return the level of this course
*/
public char getLevel()
{
return level;
} // end of method getLevel()
/**
* Returns the name of this course.
*
* @return the name of this course.
*/
public String getName()
{
return name;
} // end of method getName()
/**
* Returns the unique serial number of this course.
*
* @return the unique serial number of this course.
*/
public int getSerialNumber()
{
return serialNumber;
} // end of method getSerialNumber()
/**
* Returns the academic year of this course.
*
* @return the 4-digit academic year of this course
*/
public int getYear()
{
return academicYear;
} // end of method getYear()
/* mutators */
/**
* Sets the code of this course.
*
* @param newCode - the new code of this course.
*/
public void setCode(String newCode)
{
this.code = newCode;
} // end of method setCode(String newCode)
/**
* Sets the level of this course.
*
* @param newLevel - one of the enumerated levels
*/
public void setLevel(char newLevel)
{
if(newLevel == 7 || newLevel == 1 || newLevel == 9 || newLevel == 8)
{
level = newLevel;
}
else
{
level = DEFAULT_LEVEL;
}
} // end of method setLevel(char newLevel)
/**
* Sets the name of this course.
*
* @param newName - the new name of this course
*/
public void setName(String newName)
{
this.name = newName;
} // end of method setName(String newName)
/**
* Sets the academic year of this course.
*
* @param newYear - the new 4-digit academic year of this course
*/
public void setYear(int newYear)
{
if (newYear >= 1900 && newYear <= 2014)
{
this.academicYear = newYear;
}
else
{
academicYear = DEFAULT_YEAR;
}
} // end of method setYear(int newYear)
/**
* Returns a string representation of this course.
*
* @override toString in class Object
*
* @return a string representation of this course.
*/
public String toString()
{
return
this.getClass().getName()
+"["
+ "Serial Number: " + serialNumber
+ ", name: " + name
+ ", code: " + code
+ ", level: " + level
+ ", academic year: " + academicYear
+"]";
} // end of String toString()
} // end of class Course
答案 0 :(得分：2)
您已使用字符值＆＃39; 7＆＃39;，＆＃39; 1＆＃39;，＆＃39; 9＆＃39;，＆＃39; 8＆＃39;初始化了LEVEL。但是你的setLevel方法将它们与整数值7,1,9,8进行比较。
他们不是一回事。
坦率地说，如果LEVEL值是整数，那么你应该将它们声明为int。通过将其存储为字符，您无法实现任何目标。
答案 1 :(得分：0)
将newLevel与值进行比较时。
您实际上是将newLevel的ASCII值与整数进行比较。 这就是每次它给出Default_level作为答案的原因。 使用单引号进行比较，例如。 ＆＃39; 7＆＃39;
答案 2 :(得分：0)
我认为你应该在比较char值
时添加单引号public void setLevel(char newLevel)
{
if(newLevel == '7' || newLevel == '1' || newLevel == '9' || newLevel == '8')
{
level = newLevel;
}
else
{
level = DEFAULT_LEVEL;
}
}