Threads and how they are created

When a thread plays a major role: when the I/O that a thread executes is blocked, other threads in the same process can use the CPU to compute. In this way, the execution efficiency of the program is improved.
status : Running, Ready (waiting to be called), blocking (Waiting for I/O resources)
two ways to create :

1. inherit the thread class and override the Run () method in it (this method is appropriate when a class does not inherit other classes)
2. Implement the Runnable interface and implement the Run () method (which is appropriate when a class has inherited another Class)

Pass various parameters by using a custom construction method. Start: Call the Start () method after getting the thread object.

public class MyThread1 extends Thread {public    MyThread1 (String name) {        super (name);    }    public void Run () {        System.out.println (This.getname ());     }    public static void Main (string[] args) {        Thread t1 = new MyThread1 ("a three");        T1.start ();      }  } public class MyThread implements Runnable {private String name;  Public MyThread (String name) {  this.name = name;}  @Override public void Run () {    System.out.println (name);  }   public static void Main (string[] args) {  thread tt1 = new Thread (New MyThread ("Zhang San"));  Tt1.start ();  } }

wait and wake mechanism: Using Object.wait () and Object.notify (), the join () method must be called in a synchronous method or synchronous block to wait for the termination of another thread, such as:

A.join (); System.out.print ("End"); Wait for thread A to finish before printing "End"

the difference between sleep () and wait ()：

• Sleep (): Consumes CPU resources or is scheduled to go into ready state
• Wait (): does not consume CPU resources and waits for notify () to wake up

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Threads and how they are created