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Java 存储学生姓名和平均成绩的学生班级。
创建和测试学生对象。
实例源码：
源代码：
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public class Main4
/**5
from6
* NowJava.com 7
**/8
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{10
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public static void main(String[] args)12
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{14
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Student account1 = new Student("James Bond", 93.5);16
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Student account2 = new Student("Michael Bates", 72.75); 18
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System.out.printf("%s's letter grade is: %s%n", 21
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account1.getName(), account1.getLetterGrade()); 23
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System.out.printf("%s's letter grade is: %s%n", 25
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account2.getName(), account2.getLetterGrade()); 27
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} 29
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}31
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class Student 33
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{35
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private String name; 37
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private double average; // from N o w J a v a . c o m39
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// constructor initializes instance variables42
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public Student(String name, double average)44
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{46
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this.name = name;48
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// validate that average is > 0.0 and <= 100.0; otherwise,51
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// keep instance variable average's default value (0.0)53
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if (average > 0.0) {55
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if (average <= 100.0){57
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this.average = average; // assign to instance variable59
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}61
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}63
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}65
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// sets the Student's name68
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public void setName(String name)70
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{72
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this.name = name; 74
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}76
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// retrieves the Student's name79
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public String getName()81
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{83
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return name;85
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}87
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// sets the Student's average90
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public void setAverage(double average)92
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{94
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// validate that average is > 0.0 and <= 100.0; otherwise,96
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// keep instance variable average's current value 98
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if (average > 0.0) {100
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if (average <= 100.0){102
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this.average = average; // assign to instance variable104
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}106
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}108
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}110
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// retrieves the Student's average113
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public double getAverage()115
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{117
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return average;119
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}121
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// determines and returns the Student's letter grade124
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public String getLetterGrade()126
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{128
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