Java--线程的互斥实现（两种方法）

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我们是利用synchronized的两种方法：声明一条语句或声明一个方法

方法——：同步语句，使用synchronized(对象)后面接语句即可

方法二 同步方法，使用synchronized（this）{ 方法体 }

附方法一代码如下：

package AcountThread;public class Account {String name;private int balance;public String getName() {return name;}public int getBalance() {return balance;}public Account(String name) {this.name = name;this.balance = 0;}// 存钱public void put(int value) { // value为存入金额if (value > 0) {this.balance += value;}}// 取钱方法public double get(int value) {if (value > 0) {if (value < this.balance) {this.balance -= value;} else {value = this.balance; // 取走所有余额this.balance = 0;}}return value;}}

package AcountThread;public class FecthThread extends Thread {public Account account;public int value;public FecthThread(Account account, int value) {this.account = account;this.value = value;}public void run() {synchronized (account) {  //拿锁对象// 查看余额double howmatch = this.account.getBalance();// 取钱double v = this.account.get(value);// 查看余额System.out.println(this.account.name + "账户：现有" + howmatch + ",取走"+ v + ",余额" + this.account.getBalance());} // 解锁对象}}

package AcountThread;public class SevaThread extends Thread {public Account account;public int value;public SevaThread(Account account, int value) {this.account = account;this.value = value;}public void run() {synchronized (account) {// 查看double howmatch = this.account.getBalance();// 存钱this.account.put(value);// 查看System.out.println(account.getName() + "账户：现有" + howmatch + ",存入"+ this.value + "，余额" + this.account.getBalance());;}}}

package AcountThread;public class MainThread {public static void main(String[] args) {Account wang = new Account("wang");(new SevaThread(wang, 100)).start();// 匿名对象等价于SevaThred t1 = new    // SevaThread(wang,    // 100);t1.start();(new SevaThread(wang, 200)).start();(new FecthThread(wang, 300)).start();}}
附方法一代码如下：
package AcountThread.v2;public class Account {private String name;private int balance;public String getName() {return name;}public int getBalance() {return balance;}public Account(String name) {this.name = name;this.balance = 0;}// 存钱方法synchronized public void put(int value) { // value为存入金额if (value > 0) {double howmatch = balance; // 查看起初的金额this.balance += value;System.out.println(name + "账户：现有" + howmatch + ",存入" + value+ "，余额" + balance);;}}// 取钱方法synchronized public void get(int value) {int howmatch = balance; // 查看余额if (value > 0) {if (value < this.balance) {this.balance -= value; //} else {value = this.balance; // 取走所有余额this.balance = 0;}}System.out.println(name + "账户：现有" + howmatch + ",取走" + value + ",余额"+ balance);}}
package AcountThread.v2;public class FecthThread extends Thread {public Account account;public int value;public FecthThread(Account account, int value) {this.account = account;this.value = value;}public void run() {// 取钱this.account.get(value);}
}
package AcountThread.v2;public class SevaThread extends Thread {public Account account;public int value;public SevaThread(Account account, int value) {this.account = account;this.value = value;}public void run() {// 存钱this.account.put(value);}}
package AcountThread.v2;public class MainThread {public static void main(String[] args) {Account wang = new Account("wang");(new SevaThread(wang, 100)).start(); // 匿名对象等价于SevaThred t1 = new     // SevaThread(wang,     // 100);t1.start();(new SevaThread(wang, 200)).start();(new FecthThread(wang, 300)).start();}}

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