2、(要交)用两种方式实现三个线程,第一个线程输出5遍1- 100,第二个线程输出5遍A-z,第三个线程找出2-100000之内的 素数并输出。java

方式一：使用Thread类和Runnable接口实现三个线程。 ```java public class Main { public static void main(String[] args) { Thread t1 = new Thread(new PrintNumber()); Thread t2 = new Thread(new PrintLetter()); Thread t3 = new Thread(new FindPrime()); t1.start(); t2.start(); t3.start(); } } class PrintNumber implements Runnable { @Override public void run() { for (int i = 0; i < 5; i++) { for (int j = 1; j <= 100; j++) { System.out.print(j + " "); } System.out.println(); } } } class PrintLetter implements Runnable { @Override public void run() { for (int i = 0; i < 5; i++) { for (char j = 'A'; j <= 'Z'; j++) { System.out.print(j + " "); } System.out.println(); } } } class FindPrime implements Runnable { private boolean isPrime(int n) { if (n < 2) { return false; } for (int i = 2; i <= Math.sqrt(n); i++) { if (n % i == 0) { return false; } } return true; } @Override public void run() { for (int i = 2; i <= 100000; i++) { if (isPrime(i)) { System.out.print(i + " "); } } } } ``` 方式二：使用继承Thread类实现三个线程。 ```java public class Main { public static void main(String[] args) { PrintNumber t1 = new PrintNumber(); PrintLetter t2 = new PrintLetter(); FindPrime t3 = new FindPrime(); t1.start(); t2.start(); t3.start(); } } class PrintNumber extends Thread { @Override public void run() { for (int i = 0; i < 5; i++) { for (int j = 1; j <= 100; j++) { System.out.print(j + " "); } System.out.println(); } } } class PrintLetter extends Thread { @Override public void run() { for (int i = 0; i < 5; i++) { for (char j = 'A'; j <= 'Z'; j++) { System.out.print(j + " "); } System.out.println(); } } } class FindPrime extends Thread { private boolean isPrime(int n) { if (n < 2) { return false; } for (int i = 2; i <= Math.sqrt(n); i++) { if (n % i == 0) { return false; } } return true; } @Override public void run() { for (int i = 2; i <= 100000; i++) { if (isPrime(i)) { System.out.print(i + " "); } } } } ```