3 Ways to start threads

Thread and process relationships: one process has n threads

1. Three ways to implement threads:

(1) Inherit the thread class

[1] Creating a class that inherits the thread class

　　　　

 Package Thread01;  Public class extends Thread {    privateint  i;    @Override    publicvoid  run () {       for (; i <; i++ ) { C18/>system.out.println (GetName ()+ "\ t" +i)    ;     }}}

[2] Creating a test class

 PackageThread01; Public classMyTest { Public Static voidMain (string[] args) { for(inti = 0; I <10; i++) {System.out.println (Thread.CurrentThread (). GetName ()+ "\ T" +i+ "======"); if(i==5) {MyThread mt2=NewMyThread (); MyThread MT=NewMyThread ();                 Mt2.start ();             Mt.start (); }        }    }         Public Static Longgetmemory () {returnruntime.getruntime (). Freememory (); }}

(2) Implement Runnable interface

The class "1" Implements the Runnable interface is not a thread class, but a target of a thread class that can provide parameters for thread class construction methods to enable thread opening

 PackageThread02; Public classSecondthreadImplementsrunnable{Private inti;  Public voidrun () { for(; i <; i++) {System.out.println (Thread.CurrentThread (). GetName ()+" "+i); if(i==20) {System.out.println (Thread.CurrentThread (). GetName ()+ "Execution Complete"); }        }    }}

"2" Test class

 PackageThread02; Public classMyTest { Public Static voidMain (string[] args) { for(inti = 0; I < 10; i++) {System.out.println (Thread.CurrentThread (). GetName ()+" "+i); if(i==5) {secondthread S1=NewSecondthread (); Thread T1=NewThread (S1, "Thread 1")); Thread T2=NewThread (S1, "Thread 2"));                T1.start ();                           T2.start (); }        }    }}

(3) Implement callable interface

"1" Create callable implementation class

　　

 Package Thread03; Import java.util.concurrent.Callable;  Public class Implements Callable<integer> {    int i=0;      Public throws Exception {        for (; i <; i++ ) {            System.out.println (Thread.CurrentThread ()). GetName ()+ "" +i);        }         return i;    }}

"2" Test class

　　

 PackageThread03;ImportJava.util.concurrent.FutureTask; Public classThirdthread { Public Static voidMain (string[] args) {Target T1=NewTarget (); Futuretask<Integer> ft=NewFuturetask<integer>(t1); Thread T2=NewThread (FT, "new Thread");            T2.start (); Try{System.out.println (Ft.get ()); } Catch(Exception e) {//Todo:handle Exception            }    }}

3 Ways to start threads