Detailed examples of Java internal classes

Detailed examples of Java internal classes

You can put the definition of one class inside the definition of another class, which is the inner class.

Internal class is a very useful feature, but it is difficult to understand the use of it (I haven't used internal class much so far, and I only know a little about internal class).

First meeting

Internal classes are very easy to understand from the outside. It is nothing more than defining a class inside a class.

public class OuterClass {
  private String name ;
  private int 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;
  }

  class InnerClass{
    public InnerClass(){
      name = "chenssy";
      age = 23;
    }
  }
}