Multiple Threads are repeatedly started in Java.

Multiple Threads are repeatedly started in Java.

During the interview, I was often asked questions about multithreading:

During the test today, the following code throws an exception: java. lang. IllegalThreadStateException

public static void main(String[] args)throws Exception{        Test_Thread temp = new Test_Thread();        Test_Thread temp1 = new Test_Thread();        Thread t = new Thread(temp);        Thread t1 = new Thread(temp1);                 for(int i=0;i<50;i++){            if(i%2 == 0){                t.start();            } else {                t1.start();            }        }    }

Change to the following to run smoothly.

public static void main(String[] args)throws Exception{        Test_Thread temp = new Test_Thread();        Test_Thread temp1 = new Test_Thread();    //  Thread t = new Thread(temp);    //  Thread t1 = new Thread(temp1);          for(int i=0;i<50;i++){            if(i%2 == 0){                new Thread(temp).start();            } else {                new Thread(temp1).start();            }        }    }

Conclusion: The thread cannot call start () repeatedly, that is, a single thread cannot start again.