1、两个不同的线程交替打印Kao、La。
2、两个线程，一个打印100内的奇数一个打印100内的偶数，交替执行。
N个线程交替输出：
public static void main(String[] args) {
//示例：5个线程交替输出100次
Data data = new Data(100, 2);
new Thread(new Print(data, 0, "Kao")).start();
new Thread(new Print(data, 1, "La")).start();
new Thread(new Print(data, 2, "")).start();
new Thread(new Print(data, 3, "")).start();
new Thread(new Print(data, 4, "")).start();
//示例：2个线程交替输出Kao、La
// Data data = new Data(100, 2);
// new Thread(new Print(data, 0, "Kao")).start();
// new Thread(new Print(data, 1, "La")).start();
}
//要打印的资源
public static class Data {
public Data(int total, int t) {
this.total = total;
this.t = t;
}
volatile int count; //计数
int total; //交替输出n次
int t; //线程数
}
//打印奇数的线程
public static class Print implements Runnable {
private final int code; //编号
private final Data data; //资源
private final String content; //输出内容
public Print(Data data, int code, String content) {
this.data = data;
this.code = code;
this.content = content;
}
public void run() {
while (data.count <= data.total) {
synchronized (data) {
if (data.count % data.t == code) {
System.out.println(Thread.currentThread().getName() + " --- " + data.count + " --- " + content);
data.count++;
data.notifyAll();
} else {
try {
data.wait();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
}
}
5个线程交替输出，结果：
Thread-0 --- 0 ---
Thread-1 --- 1 ---
Thread-0 --- 2 ---
Thread-1 --- 3 ---
Thread-0 --- 4 ---
Thread-1 --- 5 ---
Thread-0 --- 6 ---
Thread-1 --- 7 ---
Thread-0 --- 8 ---
Thread-1 --- 9 ---
Thread-0 --- 10 ---
Thread-1 --- 11 ---
Thread-0 --- 12 ---
Thread-1 --- 13 ---
Thread-0 --- 14 ---
Thread-1 --- 15 ---
Thread-0 --- 16 ---
Thread-1 --- 17 ---
Thread-0 --- 18 ---
Thread-1 --- 19 ---
Thread-0 --- 20 ---
Thread-1 --- 21 ---
Thread-0 --- 22 ---
Thread-1 --- 23 ---
Thread-0 --- 24 ---
Thread-1 --- 25 ---
Thread-0 --- 26 ---
Thread-1 --- 27 ---
Thread-0 --- 28 ---
Thread-1 --- 29 ---
Thread-0 --- 30 ---
Thread-1 --- 31 ---
Thread-0 --- 32 ---
Thread-1 --- 33 ---
Thread-0 --- 34 ---
Thread-1 --- 35 ---
Thread-0 --- 36 ---
Thread-1 --- 37 ---
Thread-0 --- 38 ---
Thread-1 --- 39 ---
Thread-0 --- 40 ---
Thread-1 --- 41 ---
Thread-0 --- 42 ---
Thread-1 --- 43 ---
Thread-0 --- 44 ---
Thread-1 --- 45 ---
Thread-0 --- 46 ---
Thread-1 --- 47 ---
Thread-0 --- 48 ---
Thread-1 --- 49 ---
Thread-0 --- 50 ---
Thread-1 --- 51 ---
Thread-0 --- 52 ---
Thread-1 --- 53 ---
Thread-0 --- 54 ---
Thread-1 --- 55 ---
Thread-0 --- 56 ---
Thread-1 --- 57 ---
Thread-0 --- 58 ---
Thread-1 --- 59 ---
Thread-0 --- 60 ---
Thread-1 --- 61 ---
Thread-0 --- 62 ---
Thread-1 --- 63 ---
Thread-0 --- 64 ---
Thread-1 --- 65 ---
Thread-0 --- 66 ---
Thread-1 --- 67 ---
Thread-0 --- 68 ---
Thread-1 --- 69 ---
Thread-0 --- 70 ---
Thread-1 --- 71 ---
Thread-0 --- 72 ---
Thread-1 --- 73 ---
Thread-0 --- 74 ---
Thread-1 --- 75 ---
Thread-0 --- 76 ---
Thread-1 --- 77 ---
Thread-0 --- 78 ---
Thread-1 --- 79 ---
Thread-0 --- 80 ---
Thread-1 --- 81 ---
Thread-0 --- 82 ---
Thread-1 --- 83 ---
Thread-0 --- 84 ---
Thread-1 --- 85 ---
Thread-0 --- 86 ---
Thread-1 --- 87 ---
Thread-0 --- 88 ---
Thread-1 --- 89 ---
Thread-0 --- 90 ---
Thread-1 --- 91 ---
Thread-0 --- 92 ---
Thread-1 --- 93 ---
Thread-0 --- 94 ---
Thread-1 --- 95 ---
Thread-0 --- 96 ---
Thread-1 --- 97 ---
Thread-0 --- 98 ---
Thread-1 --- 99 ---
Thread-0 --- 100 ---
Process finished with exit code 0
2个线程交替输出Kao、La，结果：
Thread-0 --- 0 --- Kao
Thread-1 --- 1 --- La
Thread-0 --- 2 --- Kao
Thread-1 --- 3 --- La
Thread-0 --- 4 --- Kao
Thread-1 --- 5 --- La
Thread-0 --- 6 --- Kao
Thread-1 --- 7 --- La
Thread-0 --- 8 --- Kao
Thread-1 --- 9 --- La
Thread-0 --- 10 --- Kao
Thread-1 --- 11 --- La
Thread-0 --- 12 --- Kao
Thread-1 --- 13 --- La
Thread-0 --- 14 --- Kao
Thread-1 --- 15 --- La
Thread-0 --- 16 --- Kao
Thread-1 --- 17 --- La
Thread-0 --- 18 --- Kao
Thread-1 --- 19 --- La
Thread-0 --- 20 --- Kao
Thread-1 --- 21 --- La
Thread-0 --- 22 --- Kao
Thread-1 --- 23 --- La
Thread-0 --- 24 --- Kao
Thread-1 --- 25 --- La
Thread-0 --- 26 --- Kao
Thread-1 --- 27 --- La
Thread-0 --- 28 --- Kao
Thread-1 --- 29 --- La
Thread-0 --- 30 --- Kao
Thread-1 --- 31 --- La
Thread-0 --- 32 --- Kao
Thread-1 --- 33 --- La
Thread-0 --- 34 --- Kao
Thread-1 --- 35 --- La
Thread-0 --- 36 --- Kao
Thread-1 --- 37 --- La
Thread-0 --- 38 --- Kao
Thread-1 --- 39 --- La
Thread-0 --- 40 --- Kao
Thread-1 --- 41 --- La
Thread-0 --- 42 --- Kao
Thread-1 --- 43 --- La
Thread-0 --- 44 --- Kao
Thread-1 --- 45 --- La
Thread-0 --- 46 --- Kao
Thread-1 --- 47 --- La
Thread-0 --- 48 --- Kao
Thread-1 --- 49 --- La
Thread-0 --- 50 --- Kao
Thread-1 --- 51 --- La
Thread-0 --- 52 --- Kao
Thread-1 --- 53 --- La
Thread-0 --- 54 --- Kao
Thread-1 --- 55 --- La
Thread-0 --- 56 --- Kao
Thread-1 --- 57 --- La
Thread-0 --- 58 --- Kao
Thread-1 --- 59 --- La
Thread-0 --- 60 --- Kao
Thread-1 --- 61 --- La
Thread-0 --- 62 --- Kao
Thread-1 --- 63 --- La
Thread-0 --- 64 --- Kao
Thread-1 --- 65 --- La
Thread-0 --- 66 --- Kao
Thread-1 --- 67 --- La
Thread-0 --- 68 --- Kao
Thread-1 --- 69 --- La
Thread-0 --- 70 --- Kao
Thread-1 --- 71 --- La
Thread-0 --- 72 --- Kao
Thread-1 --- 73 --- La
Thread-0 --- 74 --- Kao
Thread-1 --- 75 --- La
Thread-0 --- 76 --- Kao
Thread-1 --- 77 --- La
Thread-0 --- 78 --- Kao
Thread-1 --- 79 --- La
Thread-0 --- 80 --- Kao
Thread-1 --- 81 --- La
Thread-0 --- 82 --- Kao
Thread-1 --- 83 --- La
Thread-0 --- 84 --- Kao
Thread-1 --- 85 --- La
Thread-0 --- 86 --- Kao
Thread-1 --- 87 --- La
Thread-0 --- 88 --- Kao
Thread-1 --- 89 --- La
Thread-0 --- 90 --- Kao
Thread-1 --- 91 --- La
Thread-0 --- 92 --- Kao
Thread-1 --- 93 --- La
Thread-0 --- 94 --- Kao
Thread-1 --- 95 --- La
Thread-0 --- 96 --- Kao
Thread-1 --- 97 --- La
Thread-0 --- 98 --- Kao
Thread-1 --- 99 --- La
Thread-0 --- 100 --- Kao
Process finished with exit code 0
扩展：
唤醒指定线程 https://www.cnblogs.com/myseries/p/12531986.html