1.效果圖：

2.代碼：

//可以繼承Thread重寫run函數public class MultipleThreadStudy extends Thread {    /*	MultipleThreadStudy(){}	MultipleThreadStudy(String name){		super(name);	}*/	//重寫Thread的run函數	public void run(){		for(int i=0;i<10;i++)		{			System.out.PRint("MultipleThreadStudy:i="+i);						try			{				Thread.sleep((int)Math.random()*1000);			}			catch(Exception e)			{				e.printStackTrace();			}			System.out.println("");		}	}		//******************************************多線程*********************************************************	//不論是用繼承的Thread方法還是用Runnable接口實現的方法，java里面的多個線程同時運行時，不是順序執行，而是并行執行	//如果需要順序執行，則需加判斷前一個線程是否執行完畢	//如果要順序執行，方法一：判斷線程isAlive是否在運行中，不停循環直至結束	//方法二：調用join方法	//快捷鍵注釋代碼：Ctrl+Shift+/     (/*  */  形式的) 或   Ctrl+/   (//  形式的)	//快捷鍵取消注釋：Ctrl+Shift+/     (/*  */  形式的) 或   Ctrl+/   (//  形式的)	public static void main(String[] args) {		//************繼承Thread重寫run函數的線程***************		MultipleThreadStudy thread1=new MultipleThreadStudy();		MultipleThreadStudy thread2=new MultipleThreadStudy();		MultipleThreadStudy thread3=new MultipleThreadStudy();		//thread1.setPriority(1);  //設置優先級		//thread2.setPriority(2);		//thread3.setPriority(3);		System.out.println("............thread1 run...............");		thread1.start();		//方法一：判斷線程isAlive是否在運行中，不停循環直至結束		while(thread1.isAlive())		{			try			{				Thread.sleep(100);			}			catch(Exception e)			{				e.printStackTrace();			}		}		System.out.println("............thread2 run...............");		thread2.start();		while(thread2.isAlive())		{			try			{				Thread.sleep(100);			}			catch(Exception e)			{				e.printStackTrace();			}		}		System.out.println("............thread3 run...............");		thread3.start();		while(thread3.isAlive())		{			try			{				Thread.sleep(100);			}			catch(Exception e)			{				e.printStackTrace();			}		}				//************實現Runnable的接口方法run函數*************		Runnable rb1=new RunnableThread();		Runnable rb2=new RunnableThread();		Runnable rb3=new RunnableThread();		Thread runnableThread1=new Thread(rb1);//鼠標移到Thread，按alt+/的方式看需傳的參數		Thread runnableThread2=new Thread(rb2);		Thread runnableThread3=new Thread(rb3);		System.out.println("...runnableThread1 run...");		runnableThread1.start();		//方法二：調用join方法	    try	    {			runnableThread1.join();		}		catch(Exception e)		{			e.printStackTrace();		}	    System.out.println("...runnableThread2 run...");		runnableThread2.start();		try		{			runnableThread2.join();		}		catch(Exception e)		{			e.printStackTrace();		}		System.out.println("...runnableThread3 run...");		runnableThread3.start();	}}//可以實現Runnable的接口方法run函數class RunnableThread implements Runnable{	public void run(){		for(int i=0;i<10;i++)		{			System.out.print("RunnableThread:i="+i);						try			{				Thread.sleep((int)Math.random()*1000);			}			catch(Exception e)			{				e.printStackTrace();			}			System.out.println("");		}	}}