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Examples: a thread after set sleep2000ms, see if you can take the opportunity to b thread set, resulting in a non-thread-safe
HasSelfPrivateNum.java:
package service;
public class HasSelfPrivateNum{
private int num=0;
public void addI(String username){
try{
if(username.equals("a")){
a = 100;
System.out.println("a set over!");
Thread.sleep(2000);
}else{
a = 200;
System.out.println("b set over!");
}
System.out.println(username+"num="+num);
}catch(InterruptedException e){
e.printStackTrace ();