java代码，创建两个线程，一个线程打印英文字母“A”-“z”，一个打印0-100。两种方式都要实现。

方式一：使用继承Thread类的方式实现

public class PrintLetters extends Thread {
    @Override
    public void run() {
        for (char c = 'A'; c <= 'Z'; c++) {
            System.out.print(c + " ");
        }
    }
}

public class PrintNumbers extends Thread {
    @Override
    public void run() {
        for (int i = 0; i <= 100; i++) {
            System.out.print(i + " ");
        }
    }
}

public class Main {
    public static void main(String[] args) {
        PrintLetters printLetters = new PrintLetters();
        PrintNumbers printNumbers = new PrintNumbers();
        printLetters.start();
        printNumbers.start();
    }
}

方式二：使用实现Runnable接口的方式实现

public class PrintLetters implements Runnable {
    @Override
    public void run() {
        for (char c = 'A'; c <= 'Z'; c++) {
            System.out.print(c + " ");
        }
    }
}

public class PrintNumbers implements Runnable {
    @Override
    public void run() {
        for (int i = 0; i <= 100; i++) {
            System.out.print(i + " ");
        }
    }
}

public class Main {
    public static void main(String[] args) {
        PrintLetters printLetters = new PrintLetters();
        PrintNumbers printNumbers = new PrintNumbers();
        Thread thread1 = new Thread(printLetters);
        Thread thread2 = new Thread(printNumbers);
        thread1.start();
        thread2.start();
    }
}