Java thread synchronization methods, method block differences

First, the synchronization method, whether it is the current object locked or the current class

Code Block 1

Package Com.ssss;public class Thread1 implements Runnable {  //public static object  O=new object ();    public void Run () {    pt ();    }        Public synchronized Void Pt () {    int a=0;        Synchronized (o) {for               (int i = 0; i < 5; i++) {             a++;             try {thread.sleep;} catch (Interruptedexception e) {//TODO auto-generated catch Blocke.printstacktrace ();}                  System.out.println (Thread.CurrentThread (). GetName () + "synchronized loop" + i + "++++" + a);               }          }      } public            static void Main (string[] args) {           Thread1 t1 = new Thread1 ();           Thread1 t2 = new Thread1 ();           Thread ta = new Thread (T1, "A");           Thread TB = new Thread (t2, "B");           Ta.start ();           Tb.start ();      } }

The printed result is

This shows that the current object, and A and B are two different objects, so the print sequence is confusing

Code Block 2

Look at the sync block

Package Com.ssss;public class Thread1 implements Runnable {public  static object  O=new object ();    public void Run () {    pt ();    }        public void Pt () {    int a=0;        Synchronized (o) {for               (int i = 0; i < 5; i++) {             a++;             try {thread.sleep;} catch (Interruptedexception e) {//TODO auto-generated catch Blocke.printstacktrace ();}                  System.out.println (Thread.CurrentThread (). GetName () + "synchronized loop" + i + "++++" + a);            }} public static void Main (string[] args) {           Thread1 t1 = new Thread1 ();           Thread1 t2 = new Thread1 ();           Thread ta = new Thread (T1, "A");           Thread TB = new Thread (t2, "B");           Ta.start ();           Tb.start ();      } }

Look at the print sequence

Description Sync block can lock any object

That is, the synchronization method locks the current object, and the synchronous method block can lock any object

Java thread synchronization methods, method block differences