传统线程互斥技术
package cn.itcast.heima2;public class TraditionalTreadSynchrorized {public static void main(String[] args) {new TraditionalTreadSynchrorized().init();}public void init() {final Outputer output = new Outputer();new Thread(new Runnable() {@Overridepublic void run() {while (true) {try {Thread.sleep(10);} catch (InterruptedException e) {e.printStackTrace();}output.output("zhangxiaoxiang");}}}).start();new Thread(new Runnable() {@Overridepublic void run() {while (true) {try {Thread.sleep(10);} catch (InterruptedException e) {e.printStackTrace();}output.output("lihuoming");}}}).start();} class Outputer {public void output(String name) {int len = name.length();for (int i = 0; i < len; i++) {System.out.print(name.charAt(i));}System.out.println();}}}?package cn.itcast.heima2;public class TraditionalTreadSynchrorized {public static void main(String[] args) {new TraditionalTreadSynchrorized().init();}public void init() {final Outputer output = new Outputer();new Thread(new Runnable() {@Overridepublic void run() {while (true) {try {Thread.sleep(10);} catch (InterruptedException e) {e.printStackTrace();}output.output("zhangxiaoxiang");}}}).start();new Thread(new Runnable() {@Overridepublic void run() {while (true) {try {Thread.sleep(10);} catch (InterruptedException e) {e.printStackTrace();}output.output("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();}}}}
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??2、错误代码
? 虽然两个线程调用的方法不同，可是还是在同一个对象中，当一个线程没有输出完毕的时候第二个线程就打印了
system.out.println();进行换行。
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package cn.itcast.heima2;public class TraditionalTreadSynchrorized {public static void main(String[] args) {new TraditionalTreadSynchrorized().init();}public void init() {final Outputer output = new Outputer();new Thread(new Runnable() {@Overridepublic void run() {while (true) {try {Thread.sleep(10);} catch (InterruptedException e) {e.printStackTrace();}output.output("zhangxiaoxiang");}}}).start();new Thread(new Runnable() {@Overridepublic void run() {while (true) {try {Thread.sleep(10);} catch (InterruptedException e) {e.printStackTrace();}output.output2("lihuoming");}}}).start();}class Outputer {public void output(String name) {int len = name.length();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();for (int i = 0; i < len; i++) {System.out.print(name.charAt(i));}System.out.println();}}}?
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正确代码：
synchronized 关键字加在方法上默认锁定this 对象 如果在方法中需要 使用synchronized(this){}
package cn.itcast.heima2;public class TraditionalTreadSynchrorized {public static void main(String[] args) {new TraditionalTreadSynchrorized().init();}public void init() {final Outputer output = new Outputer();new Thread(new Runnable() {@Overridepublic void run() {while (true) {try {Thread.sleep(10);} catch (InterruptedException e) {e.printStackTrace();}output.output("zhangxiaoxiang");}}}).start();new Thread(new Runnable() {@Overridepublic void run() {while (true) {try {Thread.sleep(10);} catch (InterruptedException e) {e.printStackTrace();}output.output2("lihuoming");}}}).start();}static class Outputer {public void output(String name) {synchronized (this) {int len = name.length();for (int i = 0; i < len; i++) {System.out.print(name.charAt(i));}System.out.println();}}public synchronized void output2(String name) {int len = name.length();for (int i = 0; i < len; i++) {System.out.print(name.charAt(i));}System.out.println();}}}?
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错误代码：
因为一个线程调用的静态方法，即两个线程不是调用的同一个对象，也就说明synchronized不是锁定的同一个对象。
package cn.itcast.heima2;public class TraditionalTreadSynchrorized {public static void main(String[] args) {new TraditionalTreadSynchrorized().init();}public void init() {final Outputer output = new Outputer();new Thread(new Runnable() {@Overridepublic void run() {while (true) {try {Thread.sleep(10);} catch (InterruptedException e) {e.printStackTrace();}output.output("zhangxiaoxiang");}}}).start();new Thread(new Runnable() {@Overridepublic void run() {while (true) {try {Thread.sleep(10);} catch (InterruptedException e) {e.printStackTrace();}Outputer.output3("lihuoming");}}}).start();}static class Outputer {public void output(String name) {synchronized (this) {int len = name.length();for (int i = 0; i < len; i++) {System.out.print(name.charAt(i));}System.out.println();}}public static synchronized void output3(String name) {int len = name.length();for (int i = 0; i < len; i++) {System.out.print(name.charAt(i));}System.out.println();}}}?
?正确代码如下：
因为需要锁定静态对象 所以要使用Outputer.class
package cn.itcast.heima2;public class TraditionalTreadSynchrorized {public static void main(String[] args) {new TraditionalTreadSynchrorized().init();}public void init() {final Outputer output = new Outputer();new Thread(new Runnable() {@Overridepublic void run() {while (true) {try {Thread.sleep(10);} catch (InterruptedException e) {e.printStackTrace();}output.output("zhangxiaoxiang");}}}).start();new Thread(new Runnable() {@Overridepublic void run() {while (true) {try {Thread.sleep(10);} catch (InterruptedException e) {e.printStackTrace();}Outputer.output3("lihuoming");}}}).start();}static class Outputer {public void output(String name) {synchronized (Outputer.class) {int len = name.length();for (int i = 0; i < len; i++) {System.out.print(name.charAt(i));}System.out.println();}}public static synchronized void output3(String name) {int len = name.length();for (int i = 0; i < len; i++) {System.out.print(name.charAt(i));}System.out.println();}}}?
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