Java final 关键字理解 博客分类： Java

public class TestFinal {
    private static final String name = "testName";
    private static final Person person = new Person("Test person name",18);
    public static void main(String[] args) {
        System.out.println("TestFinal.name:"+TestFinal.name);
        //The final field TestFinal.name cannot be assigned
        //TestFinal.name = "Test Name Change";
        System.out.println("TestFinal.person.getName():"+TestFinal.person.getName());
        System.out.println("TestFinal.person.getAge():"+TestFinal.person.getAge());
        TestFinal.person.setName("Test person name changed");
        TestFinal.person.setAge(20);
        System.out.println("After changed value TestFinal.person.getName():"+TestFinal.person.getName());
        System.out.println("After changed value TestFinal.person.getAge():"+TestFinal.person.getAge());

    }
}

class Person{
    private String name;
    private int age;
    public Person(String name,int age){
        this.name = name;
        this.age = age;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
   
}
/*运行后为：

TestFinal.name:testName
TestFinal.person.getName():Test person name
TestFinal.person.getAge():18
After changed value TestFinal.person.getName():Test person name changed
After changed value TestFinal.person.getAge():20

*/