Inner Classes

[gmioannou]

What is the need of inner classes?

[JosAH]

Have a look at this example:

public class Star {
 
    private String name;
 
    public Star(String name) { this.name= name; }
 
    public class Planet {
 
        private String name;
 
        public Planet(String name) { this.name= name; }
 
        public class Moon {
 
            private String name; 
 
            public Moon(String name) { this.name= name; }
 
            public String toString() { return name+" (orbiting "+Planet.this+")"; }
        }
 
        public String toString() { return name+" (orbiting "+Star.this+")"; }
    }
 
    public String toString() { return name; }
 
    public static void main(String[] args) {
 
        System.out.println(new Star("sun").new Planet("earth").new Moon("moon"));
    }
}
 

kind regards,

Jos

[gmioannou]

Thanks, Very helpfull...

[BigDaddyLH]

A more prosaic example, from the Swing tutorial:

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