final关键字的讲解

1、父类

package com.wyq.study;

public class Employer {
	private String name;
	int age;
	public static final int workNo = 10;
	public void setName(String name){
		this.name = name;
	}
	public String getName(){
		return name;
	}
//	public void setAge(int age){
//		this.age = age;
//	}
//	public int getAge(){
//		return age;
//	}
	public Employer(){
		super();
		System.out.println("无参构造"+this.name+"\t"+this.age+"\t"+workNo);
	}
	public Employer(String name,int age){
		super();
		this.name = name;
		this.age = age;
		System.out.println("employer的带参构造"+this.name+"\t"+age+"\t"+workNo);
	}
	public  final void waitt(String work){
		System.out.println("我的工作单位是"+work);
	}
}

2、子类

package com.wyq.study;

public class Employee extends Employer{
	
	private String department;
	public void setDepartment(String department){
		this.department = department;
	}
	public String getDepartment(){
		return department;
	}
	public Employee(){
		super();
		System.out.println("这里是子类的无参构造");
	}
	public Employee(String name,int age,String department){
		super(name,age);
		this.department = department;
		System.out.println("这里是无参构造"+super.workNo+"\t"+super.getName()+"\t"+super.getClass()+"\t"+this.age+"\t"+super.workNo);
	}
	public void show(){
		System.out.println(super.getName()+"\t"+super.age+super.workNo);
	}	
}

3、测试类

package com.wyq.study;

public class TestEmp {
	public static void main(String[] args) throws InterruptedException {
		Employee e = new Employee("李四",12,"财务部");
		e.show();
		System.out.println(e+"\t"+e.age+"\t"+e.getName()+"\t"+e.getDepartment()+"\t"+e.workNo);
		Employer e1 = new Employee("李四",12,"财务部");
		e.waitt("jsldfj");
		e1.waitt("阿里巴巴集团");
	}
}

4、输出结果

employer的带参构造李四	12	10
这里是无参构造10	李四	class com.wyq.study.Employee	12	10
李四	1210
com.wyq.study.Employee@30de3c87	12	李四	财务部	10
employer的带参构造李四	12	10
这里是无参构造10	李四	class com.wyq.study.Employee	12	10
我的工作单位是jsldfj
我的工作单位是阿里巴巴集团

5、总结

1）final可以修饰属性，被final修饰的属性一般为常量，其值不能被更改

2）final可以修饰方法，被final修饰的方法，不能被子类重写，但是子类可以调用

3）final也可以修饰类，被final修饰的类不能有子类，比如像math类

4）final和abstract是互斥的关系