创建两个线程，要求如下： （1）一个线程输出100个1~26，另一个线程输出100个a~z。 （2）一个线程使用集成Thread类的写法，另一个线程使用实现Runnable接口的写法。

好的，以下是满足你要求的代码：

使用集成Thread类的写法：

public class ThreadDemo extends Thread {
    private int start;
    private int end;

    public ThreadDemo(int start, int end) {
        this.start = start;
        this.end = end;
    }

    @Override
    public void run() {
        for (int i = start; i <= end; i++) {
            System.out.print((char) (i + 'a' - 1) + " ");
        }
    }
}

public class Main {
    public static void main(String[] args) {
        ThreadDemo thread1 = new ThreadDemo(1, 26);
        ThreadDemo thread2 = new ThreadDemo(1, 26);
        thread1.start();
        thread2.start();
    }
}

使用实现Runnable接口的写法：

public class RunnableDemo implements Runnable {
    private int start;
    private int end;

    public RunnableDemo(int start, int end) {
        this.start = start;
        this.end = end;
    }

    @Override
    public void run() {
        for (int i = start; i <= end; i++) {
            System.out.print(i + " ");
        }
    }
}

public class Main {
    public static void main(String[] args) {
        RunnableDemo runnable1 = new RunnableDemo(1, 26);
        RunnableDemo runnable2 = new RunnableDemo(1, 26);
        Thread thread1 = new Thread(runnable1);
        Thread thread2 = new Thread(runnable2);
        thread1.start();
        thread2.start();
    }
}