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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7.  
  8.  class GradeBookTest 
  9.  { 
  10. 	public static void main( String[] args ) 
  11. 	{ 
  12.  
  13. 		int[] gradesArray = { 87, 68, 94, 100, 83, 78, 85, 91, 76, 87 }; 
  14.  
  15. 		GradeBook myGradeBook = new GradeBook("CS101 Introduction to Java Programming", gradesArray ); 
  16. 		myGradeBook.displayMessage(); 
  17. 		myGradeBook.processGrades(); 
  18. 	} 
  19.  } 
  20.  
  21.  
  22.  class GradeBook 
  23.  { 
  24. 	private String courseName; 
  25. 	private int[] grades; 
  26.  
  27. 	public GradeBook( String name, int[] gradesArray ) 
  28. 	{ 
  29. 		courseName = name;
  30. 		grades = gradesArray; 
  31. 	} 
  32. 	public void setCourseName( String name ) 
  33. 	{ 
  34. 		courseName = name;
  35. 	} 
  36. 	public String getCourseName() 
  37. 	{ 
  38. 		return courseName;
  39. 	} 
  40. 	public void displayMessage() 
  41. 	{ 
  42. 		System.out.printf( "Welcome to the grade book for%s!",getCourseName() ); 
  43. 	} 
  44. 	public void processGrades() 
  45. 	{ 
  46. 		outputGrades(); 
  47. 		System.out.printf( "Class average is %.2f", getAverage() ); 
  48. 		outputBarChart(); 
  49. 	} 
  50. 	public double getAverage() 
  51. 	{ 
  52. 		int total = 0; // initialize total
  53. 		for ( int grade : grades ) 
  54. 			total += grade; 
  55. 		return ( double ) total / grades.length; 
  56. 	} 
  57.  
  58. 	public void outputBarChart() 
  59. 	{
  60. 		int[] frequency=new int[11];
  61.  
  62. 		for(int i = 0; i < grades.length; i++){
  63. 			/*
  64. 			switch(grades[i]/10){
  65. 				case 0:
  66. 					frequency[0]++;
  67. 					break;
  68. 				case 1:
  69. 					frequency[1]++;
  70. 					break;
  71. 				case 2:
  72. 					frequency[2]++;
  73. 					break;
  74. 				case 3:
  75. 					frequency[3]++;
  76. 					break;
  77. 				case 4:
  78. 					frequency[4]++;
  79. 					break;
  80. 				case 5:
  81. 					frequency[5]++;
  82. 					break;
  83. 				case 6:
  84. 					frequency[6]++;
  85. 					break;
  86. 				case 7:
  87. 					frequency[7]++;
  88. 					break;
  89. 				case 8:
  90. 					frequency[8]++;
  91. 					break;
  92. 				case 9:
  93. 					frequency[9]++;
  94. 					break;
  95. 				case 10:
  96. 					frequency[10]++;
  97. 					break;
  98. 			}*/
  99.  
  100. 			frequency[grades[i]/10]++;  //例如25分 歸類到frequency[2]
  101. 		}
  102.  
  103. 		System.out.println();
  104. 		System.out.print("Grade distribution:");
  105. 		for(int i = 0; i < frequency.length; i++){
  106. 			System.out.println();
  107. 			if(i == frequency.length-1)
  108. 				System.out.print("100:");
  109. 			else
  110. 				System.out.print(i+"0-"+i+"9:");
  111. 			for(int j = 0; j < frequency[i]; j++){
  112. 				System.out.print("*");
  113. 			}
  114. 		}
  115.  
  116. 	}	
  117.  
  118. 	public void outputGrades() 
  119. 	{ 
  120. 		System.out.println( "The grades are:" ); 
  121. 		for ( int student = 0; student < grades.length; student++ ) 
  122. 			System.out.printf( "Student %2d: %3d", student + 1, grades[ student ] ); 
  123. 	} 
  124.  }
Success #stdin #stdout 0.05s 2184192KB
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stdout
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Welcome to the grade book forCS101 Introduction to Java Programming!The grades are:
Student  1:  87Student  2:  68Student  3:  94Student  4: 100Student  5:  83Student  6:  78Student  7:  85Student  8:  91Student  9:  76Student 10:  87Class average is 84.90
Grade distribution:
00-09:
10-19:
20-29:
30-39:
40-49:
50-59:
60-69:*
70-79:**
80-89:****
90-99:**
100:*
https://ideone.com/gFopHp
language:
Java (12.0.1)
created:
6 years ago
visibility:
public

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