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时代Java

Java 创建和使用类

欢马劈雪

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创建和使用类

实例源码：

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public class Main {

public static void main(String[] args) {/* 来 自 NowJava.com - 时  代  Java*/

// instantiate CommissionEmployee object

Employee employee = new Employee("Ana", "Bates", "222-22-2222", 10000, .06);

// get commission employee data

System.out.println("Employee information obtained by get methods:");

System.out.printf("%n%s %s%n", "First name is", employee.getFirstName());

System.out.printf("%s %s%n", "Last name is", employee.getLastName());

System.out.printf("%s %s%n", "Social security number is",

employee.getSocialSecurityNumber());

System.out.printf("%s %.2f%n", "Gross sales is", employee.getGrossSales());

System.out.printf("%s %.2f%n", "Commission rate is",

employee.getCommissionRate());

employee.setGrossSales(5000);

employee.setCommissionRate(.1);

System.out.printf("%n%s:%n%n%s%n",// 来自 N o w  J a v a  .   c o m

"Updated employee information obtained by toString", employee);

}

class Employee extends Object {

private final String firstName;

private final String lastName;

private final String socialSecurityNumber;

private double grossSales; // gross weekly sales

private double commissionRate; // commission percentage

// five-argument constructor

public Employee(String firstName, String lastName,

String socialSecurityNumber, double grossSales, double commissionRate) {

// implicit call to Object's default constructor occurs here

// if grossSales is invalid throw exception

if (grossSales < 0.0)

throw new IllegalArgumentException("Gross sales must be >= 0.0");

// if commissionRate is invalid throw exception

if (commissionRate <= 0.0 || commissionRate >= 1.0)

throw new IllegalArgumentException(

"Commission rate must be > 0.0 and < 1.0");

this.firstName = firstName;

this.lastName = lastName;

this.socialSecurityNumber = socialSecurityNumber;

this.grossSales = grossSales;

this.commissionRate = commissionRate;

}

// return first name

public String getFirstName() {

return firstName;

}

// return last name

public String getLastName() {

return lastName;

}

// return social security number

public String getSocialSecurityNumber() {

return socialSecurityNumber;

}

// set gross sales amount

public void setGrossSales(double grossSales) {

if (grossSales < 0.0)

throw new IllegalArgumentException("Gross sales must be >= 0.0");

this.grossSales = grossSales;

}

// return gross sales amount

public double getGrossSales() {

return grossSales;

}

// set commission rate

public void setCommissionRate(double commissionRate) {

if (commissionRate <= 0.0 || commissionRate >= 1.0)

throw new IllegalArgumentException(

"Commission rate must be > 0.0 and < 1.0");

this.commissionRate = commissionRate;

}

// return commission rate

public double getCommissionRate() {
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编辑于 2020-03-26 09:23:272020-03-26 09:23:27

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