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在java項目中利用多線程怎么交替打印兩個數？相信很多沒有經驗的人對此束手無策，為此本文總結了問題出現的原因和解決方法，通過這篇文章希望你能解決這個問題。
方法1、使用wait和notify
package com.thread;
public class T01 {
public static void main(String[] args) {
char[] char1 = "AAAAAA".toCharArray();
char[] char2 = "BBBBBB".toCharArray();
Object object = new Object();
Thread thread1 = new Thread(() -> {
synchronized(object){//使用notify和wait時，必須要選獲取到鎖
for (int i = 0; i < char1.length; i++) {
try {
System.out.print(char1[i]);
object.notify();
object.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
object.notify();//必須加上，否則程序無法結束，兩個線程總有一個最后是wait狀態，所以此處必須加
}
},"t1");
Thread thread2 = new Thread( () -> {
synchronized(object){
for (int i = 0; i < char2.length; i++) {
try {
System.out.print(char2[i]);
object.notify();
object.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
object.notify();
}
},"t2");
thread1.start();
thread2.start();
}
}方法2、使用LockSupport方法
package com.thread;
import java.util.concurrent.locks.LockSupport;
public class T02 {
static Thread thread1 ;
static Thread thread2 ;
public static void main(String[] args) {
char[] char1 = "AAAAAA".toCharArray();
char[] char2 = "BBBBBB".toCharArray();
thread1 = new Thread(() -> {
for (int i = 0; i < char1.length; i++) {
System.out.print(char1[i]);
LockSupport.unpark(thread2);
LockSupport.park();
}
},"t1");
thread2 = new Thread(() -> {
for (int i = 0; i < char2.length; i++) {
LockSupport.park();
System.out.print(char2[i]);
LockSupport.unpark(thread1);
}
},"t2");
thread1.start();
thread2.start();
}
}方法3、使用CAS自旋鎖
package com.thread;
public class T03 {
enum ReadEnum{
T1,
T2;
}
static volatile ReadEnum r = ReadEnum.T1;
public static void main(String[] args) {
char[] char1 = "AAAAAA".toCharArray();
char[] char2 = "BBBBBB".toCharArray();
Thread thread1 = new Thread(() ->{
for (int i = 0; i < char1.length; i++) {
while (r != ReadEnum.T1) {
}
System.out.print(char1[i]);
r = ReadEnum.T2;
}
},"t1");
Thread thread2 = new Thread(() ->{
for (int i = 0; i < char2.length; i++) {
while (r != ReadEnum.T2) {
}
System.out.print(char2[i]);
r = ReadEnum.T1;
}
},"t2");
thread1.start();
thread2.start();
}
}方法4、使用Condition方法
package com.thread;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;
public class T04 {
public static void main(String[] args) {
char[] char1 = "AAAAAA".toCharArray();
char[] char2 = "BBBBBB".toCharArray();
ReentrantLock lock = new ReentrantLock();
Condition condition1 = lock.newCondition();
Condition condition2 = lock.newCondition();
Thread thread1 = new Thread(() ->{
try {
lock.lock();
for (int i = 0; i < char1.length; i++) {
System.out.print(char1[i]);
condition2.signal();//喚醒線程2執行
condition1.await();//線程1等待
}
condition2.signal();
}catch (Exception e) {
e.printStackTrace();
}finally{
lock.unlock();
}
},"t1");
Thread thread2 = new Thread(() ->{
try {
lock.lock();
for (int i = 0; i < char2.length; i++) {
System.out.print(char2[i]);
condition1.signal();
condition2.await();
}
condition1.signal();
} catch (Exception e) {
e.printStackTrace();
}finally{
lock.unlock();
}
},"t2");
thread1.start();
thread2.start();
}
}Condition與notify相比的好處是，Condition可以指定需要喚醒的線程，而notify是無法指定的，只能隨機喚醒一個或者全喚醒(notifyAll)
看完上述內容，你們掌握在java項目中利用多線程怎么交替打印兩個數的方法了嗎？如果還想學到更多技能或想了解更多相關內容，歡迎關注億速云行業資訊頻道，感謝各位的閱讀！
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