Javaでメソッド内部に名前付クラスを定義する（ネタ） ref: http://qiita.com/kurogelee/items/14743ce166223ab80403

file1.txt

runB2:class neta.MethodInner$2ThreadB
runB1:class neta.MethodInner$1ThreadB
runC:class neta.MethodInner$ThreadC

MethodInner.java

package neta;

public class MethodInner {
    public static void main(String[] args) {
        new MethodInner().proc();
        class ThreadB extends Thread{
            public void run(){
                System.out.println("runB1:"+ getClass());
            }
        }
        new ThreadB().start();
        new ThreadC().start();
    }

    private void proc() {
        class ThreadB extends Thread{
            public void run(){
                System.out.println("runB2:"+ getClass());
            }
        }
        new ThreadB().start();
    }

    static class ThreadC extends Thread{
        public void run(){
            System.out.println("runC:"+ getClass());
        }
    }
}