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Java 创建和使用类
创建和使用类
实例源码：
源代码：
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public class Main {3
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public static void main(String[] args) {/* 来 自 NowJava.com - 时 代 Java*/5
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// instantiate CommissionEmployee object7
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Employee employee = new Employee("Ana", "Bates", "222-22-2222", 10000, .06);9
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// get commission employee data12
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System.out.println("Employee information obtained by get methods:");14
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System.out.printf("%n%s %s%n", "First name is", employee.getFirstName());16
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System.out.printf("%s %s%n", "Last name is", employee.getLastName());18
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System.out.printf("%s %s%n", "Social security number is",20
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employee.getSocialSecurityNumber());22
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System.out.printf("%s %.2f%n", "Gross sales is", employee.getGrossSales());24
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System.out.printf("%s %.2f%n", "Commission rate is",26
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employee.getCommissionRate());28
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employee.setGrossSales(5000);31
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employee.setCommissionRate(.1);33
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System.out.printf("%n%s:%n%n%s%n",// 来自 N o w J a v a . c o m36
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"Updated employee information obtained by toString", employee);38
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}40
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}42
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class Employee extends Object {45
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private final String firstName;47
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private final String lastName;49
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private final String socialSecurityNumber;51
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private double grossSales; // gross weekly sales53
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private double commissionRate; // commission percentage55
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// five-argument constructor58
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public Employee(String firstName, String lastName,60
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String socialSecurityNumber, double grossSales, double commissionRate) {62
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// implicit call to Object's default constructor occurs here64
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// if grossSales is invalid throw exception67
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if (grossSales < 0.0)69
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throw new IllegalArgumentException("Gross sales must be >= 0.0");71
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// if commissionRate is invalid throw exception74
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if (commissionRate <= 0.0 || commissionRate >= 1.0)76
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throw new IllegalArgumentException(78
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"Commission rate must be > 0.0 and < 1.0");80
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this.firstName = firstName;83
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this.lastName = lastName;85
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this.socialSecurityNumber = socialSecurityNumber;87
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this.grossSales = grossSales;89
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this.commissionRate = commissionRate;91
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}93
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// return first name96
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public String getFirstName() {98
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return firstName;100
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}102
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// return last name105
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public String getLastName() {107
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return lastName;109
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}111
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// return social security number114
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public String getSocialSecurityNumber() {116
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return socialSecurityNumber;118
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}120
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// set gross sales amount123
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public void setGrossSales(double grossSales) {125
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if (grossSales < 0.0)127
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throw new IllegalArgumentException("Gross sales must be >= 0.0");129
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this.grossSales = grossSales;132
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}134
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// return gross sales amount137
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public double getGrossSales() {139
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return grossSales;141
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}143
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// set commission rate146
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public void setCommissionRate(double commissionRate) {148
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if (commissionRate <= 0.0 || commissionRate >= 1.0)150
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throw new IllegalArgumentException(152
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"Commission rate must be > 0.0 and < 1.0");154
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this.commissionRate = commissionRate;157
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}159
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// return commission rate162
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public double getCommissionRate() {164
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