难以理解

public class Solution { public static void main(String[] args) { Person person = new Person(); System.out.println("年龄：" + person.age); person.adjustAge(person.age); System.out.println("调整后的年龄：" + person.age); } public static class Person { public int age = 20; public void adjustAge(int i) { age = i + 20; System.out.println("adjustAge() 中的年龄为 " + age); } } }

public class Solution { public static void main(String[] args) { Person person = new Person(); System.out.println("年龄：" + person.age); person.adjustAge(person.age); System.out.println("调整后的年龄：" + person.age); } public static class Person { public int age = 20; public void adjustAge(int age) { this.age = age + 20; System.out.println("adjustAge() 中的年龄为 " + age); } } }

this.age = age + 20;

package zh.codegym.task.task04.task0401; /* 这个年龄不适合我... */ public class Solution { public static void main(String[] args) { Person person = new Person(); System.out.println("年龄：" + person.age); person.adjustAge(person.age); System.out.println("调整后的年龄：" + person.age); } public static class Person { public int age = 20; public void adjustAge(int age) { this.age = age + 20; System.out.println("adjustAge() 中的年龄为 " + this.age); } } }

too difficult

package zh.codegym.task.task04.task0401; /* 这个年龄不适合我... */ public class Solution { public static void main(String[] args) { Person person = new Person(); System.out.println("年龄：" + person.age); person.adjustAge(person.age); System.out.println("调整后的年龄：" + person.age); } public static class Person { public int age = 20; public void adjustAge(int age) { this.age = age + 20; System.out.println("adjustAge() 中的年龄为 " + age); } } }

你需要在adjustAge 方法里加上 this.age=age;