分别使用继承 Thread 类的方式和实现 Runnable 接口的方式创建主线程 main 和子线程，修改两个线程的名称分别为李雷和韩梅梅，让其同步循环打印出“李雷线程输出：i”和“韩梅梅线程输出：i”。循环次数为 30 次。

在Java中，有两种常见的方式创建线程：通过继承`Thread`类和实现`Runnable`接口。这里我会分别演示这两种方法，并设置线程名称。

**1. 继承Thread类的方式：**

class LiLeiThread extends Thread {
    private String name = "李雷";

    public LiLeiThread() {
        super();
    }

    @Override
    public void run() {
        for (int i = 0; i < 30; i++) {
            System.out.println(name + "线程输出：" + i);
        }
    }
}

public class HanMeimeiThread extends Thread {
    private String name = "韩梅梅";

    public HanMeimeiThread() {
        super();
    }

    @Override
    public void run() {
        for (int i = 0; i < 30; i++) {
            System.out.println(name + "线程输出：" + i);
        }
    }
}

public class Main {
    public static void main(String[] args) {
        LiLeiThread lilei = new LiLeiThread();
        HanMeimeiThread hanmeimei = new HanMeimeiThread();

        lilei.setName("李雷");
        hanmeimei.setName("韩梅梅");

        lilei.start(); // 启动李雷线程
        hanmeimei.start(); // 启动韩梅梅线程
    }
}

**2. 实现Runnable接口的方式：**

class LiLeiRunnable implements Runnable {
    private String name = "李雷";
    
    @Override
    public void run() {
        for (int i = 0; i < 30; i++) {
            System.out.println(name + "线程输出：" + i);
        }
    }
}

class HanMeimeiRunnable implements Runnable {
    private String name = "韩梅梅";
    
    @Override
    public void run() {
        for (int i = 0; i < 30; i++) {
            System.out.println(name + "线程输出：" + i);
        }
    }
}

public class Main {
    public static void main(String[] args) {
        Thread lileiThread = new Thread(new LiLeiRunnable());
        Thread hanmeimeiThread = new Thread(new HanMeimeiRunnable());

        lileiThread.setName("李雷");
        hanmeimeiThread.setName("韩梅梅");

        lileiThread.start(); // 启动李雷线程
        hanmeimeiThread.start(); // 启动韩梅梅线程
    }
}