package com.yhh.chap2;
public class TraditionalThreadSynchronized {
/**
* @param args
*/
public static void main(String[] args) {
new TraditionalThreadSynchronized().init();
}
private void init(){
final Outputer outputer = new Outputer();
new Thread(new Runnable(){
@Override
public void run() {
while(true){
try {
Thread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
outputer.output("zhangxiaoxiang");
}
}
}).start();
new Thread(new Runnable(){
@Override
public void run() {
while(true){
try {
Thread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
outputer.output2("lihuoming");
}
}
}).start();
}
class Outputer{
public void output(String name){
int len = name.length();
synchronized(this) {
for(int i=0;i<len;i++){
System.out.print(name.charAt(i));
}
System.out.println();
}
}
public void output2(String name){
int len = name.length();
synchronized(this) {
for(int i=0;i<len;i++){
System.out.print(name.charAt(i));
}
System.out.println();
}
}
}
}
也可以写成以下：
package com.yhh.chap2;
public class TraditionalThreadSynchronized {
/**
* @param args
*/
public static void main(String[] args) {
new TraditionalThreadSynchronized().init();
}
private void init(){
final Outputer outputer = new Outputer();
new Thread(new Runnable(){
@Override
public void run() {
while(true){
try {
Thread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
outputer.output("zhangxiaoxiang");
}
}
}).start();
new Thread(new Runnable(){
@Override
public void run() {
while(true){
try {
Thread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
outputer.output2("lihuoming");
}
}
}).start();
}
class Outputer{
public void output(String name){
int len = name.length();
synchronized(this) {
for(int i=0;i<len;i++){
System.out.print(name.charAt(i));
}
System.out.println();
}
}
//也是代表加的锁是调用此方法的当前对象outputer
public synchronized void output2(String name){
int len = name.length();
// synchronized(this) {
for(int i=0;i<len;i++){
System.out.print(name.charAt(i));
}
System.out.println();
// }
}
}
}
此时上面synchronized（里面代表的是同一个outputer对象）结果正常：
lihuoming
zhangxiaoxiang
zhangxiaoxiang
lihuoming
lihuoming
zhangxiaoxiang
zhangxiaoxiang
lihuoming
package com.yhh.chap2;
public class TraditionalThreadSynchronized {
/**
* @param args
*/
public static void main(String[] args) {
new TraditionalThreadSynchronized().init();
}
private void init(){
final Outputer outputer = new Outputer();
new Thread(new Runnable(){
@Override
public void run() {
while(true){
try {
Thread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
new Outputer().output("zhangxiaoxiang");
}
}
}).start();
new Thread(new Runnable(){
@Override
public void run() {
while(true){
try {
Thread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
outputer.output2("lihuoming");
}
}
}).start();
}
class Outputer{
public void output(String name){
int len = name.length();
synchronized(this) {
for(int i=0;i<len;i++){
System.out.print(name.charAt(i));
}
System.out.println();
}
}
public void output2(String name){
int len = name.length();
synchronized(this) {
for(int i=0;i<len;i++){
System.out.print(name.charAt(i));
}
System.out.println();
}
}
}
}
此时上面synchronized(里面不是同一个对象，第一个是new了一个新对象,第二个是outputer)
所以结果：出现问题
lihuoming
lihuoming
zhangxiaoxiang
zhangxiaoxlihuoming
iang
lihuoming
zhangxiaoxiang
lihuozhaminngxiaoxig
ang
package com.yhh.chap2;
public class TraditionalThreadSynchronized {
/**
* @param args
*/
public static void main(String[] args) {
new TraditionalThreadSynchronized().init();
}
private void init(){
final Outputer outputer = new Outputer();
new Thread(new Runnable(){
@Override
public void run() {
while(true){
try {
Thread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
outputer.output("zhangxiaoxiang");
}
}
}).start();
new Thread(new Runnable(){
@Override
public void run() {
while(true){
try {
Thread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
outputer.output2("lihuoming");
}
}
}).start();
}
class Outputer{
public void output(String name){
int len = name.length();
synchronized(Outputer.class) {
for(int i=0;i<len;i++){
System.out.print(name.charAt(i));
}
System.out.println();
}
}
public void output2(String name){
int len = name.length();
synchronized(Outputer.class) {
for(int i=0;i<len;i++){
System.out.print(name.charAt(i));
}
System.out.println();
}
}
}
}
此时上面调用方法的对象是同一个outputer,synchronized(里面加的是唯一的字节码)
没有问题：
zhangxiaoxiang
lihuoming
lihuoming
zhangxiaoxiang
zhangxiaoxiang
lihuoming
zhangxiaoxiang
lihuoming
zhangxiaoxiang
package com.yhh.chap2;
public class TraditionalThreadSynchronized {
/**
* @param args
*/
public static void main(String[] args) {
new TraditionalThreadSynchronized().init();
}
private void init(){
final Outputer outputer = new Outputer();
new Thread(new Runnable(){
@Override
public void run() {
while(true){
try {
Thread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
new Outputer().output("zhangxiaoxiang");
}
}
}).start();
new Thread(new Runnable(){
@Override
public void run() {
while(true){
try {
Thread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
outputer.output2("lihuoming");
}
}
}).start();
}
class Outputer{
public void output(String name){
int len = name.length();
synchronized(Outputer.class) {
for(int i=0;i<len;i++){
System.out.print(name.charAt(i));
}
System.out.println();
}
}
public void output2(String name){
int len = name.length();
synchronized(Outputer.class) {
for(int i=0;i<len;i++){
System.out.print(name.charAt(i));
}
System.out.println();
}
}
}
}
此时上面调用方法的对象不是同一个，但synchronized(Outputer.class)是一样的所以没得问题：
zhangxiaoxiang
lihuoming
lihuoming
zhangxiaoxiang
zhangxiaoxiang
lihuoming
zhangxiaoxiang
lihuoming
zhangxiaoxiang
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