屬性私有化，使用private關鍵字。

照Java的開發標準而言，外部要想操作私有屬性，需要按照如下形式定義操作方法：setter、getter：

setter（private String name）：public void setName(String n);
getter（private String name）：public String getName();

class Employee {// 僱員類
	private int number ;
	private String name ;
	private String job ;
	private double salary ;
	private double income ;
	private String phoneNumber;
	private String address;
	public Employee(int number, String name, String job, double salary, double income,String phoneNumber,String address) {
		// TODO Auto-generated constructor stub
		this.number=number;
		this.name=name;
		this.job=job;
		this.salary=salary;
		this.income=income;
		this.phoneNumber=phoneNumber;
		this.address=address;
	}
	public int getNumber() {
		return number;
	}
	public void setNumber() {
		this.number = number;
	}
	public String getName() {
		return name;
	}
	public void setName() {
		this.name = name;
	}
	public String getJob() {
		return job;
	}
	public void setJob() {
		this.job = job;
	}
	public double getSalary(){
		return salary;
	}
	public void setSalary(double salary) {
		this.salary = salary;
	}
	public double getIncome() {
		return income;
	}
	public void setIncome(double income) {
		this.income = income;
	}
	public String getPhoneNumber() {
		return phoneNumber;
	}
	public void setPhoneNumber(String phoneNumber) {
		this.phoneNumber = phoneNumber;
	}
	public String getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
	public double salary() {
		return salary+income;
	}
	public double income() {
		return this.salary()*12;
	}
	public String getInfo(){
		return "僱員資訊："+"\n"+
	            "|編號："+this.getNumber()+"\n"+
				"|姓名："+this.getName()+"\n"+
	            "|職位："+this.getJob()+"\n"+
				"|工資："+this.getSalary()+"\n"+
	            "|佣金："+this.getIncome()+"\n"+
				"|月薪："+this.salary()+"\n"+
	            "|年薪："+this.income()+"\n"+
				"|電話："+this.getPhoneNumber()+"\n"+
				"|地址："+this.getAddress()+"\n";		
	}
}
public class Demo {
	public static void main(String[] args) {
		Employee Employee=new Employee(10001,"李白","Java開發工程師",20000.0,5000.0,"18888888888","長安");
		System.out.println(Employee.getInfo());
	}	
}
 

僱員資訊：
|編號：10001
|姓名：李白
|職位：Java開發工程師
|工資：20000.0
|佣金：5000.0
|月薪：25000.0
|年薪：300000.0
|電話：18888888888
|地址：長安