public class Main {
static int i = 0;
public static void main(String[] args) {
//啟動線程
new mThread().start();
new mThread().start();
//主線程中循環(huán)
for (; i < 100; i++) {
System.out.println(Thread.currentThread().getName() + "->" + i);
}
}
}
class mThread extends Thread {
int i = 0;
@Override
public void run() {
super.run();
for (; i < 100; i++) {
System.out.println(getName() + "->" + i);
}
}
}
public class Main {
static int i = 0;
public static void main(String[] args) {
//啟動線程
mThread mThread = new mThread();
new Thread(mThread).start();
new Thread(mThread).start();
//主線程中循環(huán)
for (; i < 100; i++) {
System.out.println(Thread.currentThread().getName() + "->" + i);
}
}
}
class mThread implements Runnable {
int i = 0;
@Override
public void run() {
for (; i < 100; i++) {
System.out.println(Thread.currentThread().getName() + "->" + i);
}
}
}
注意: 上面代碼中的Thread 公用的一個Runnable Target 所以變量i只有一份 打印的時候 兩個線程公用的是一個變量i,兩個線程 不共用一個線程方法就是 創(chuàng)建兩個Runnable Target 這樣就會創(chuàng)建兩個變量i線程和線程之間就沒有聯(lián)系了
public class Main {
static int i = 0;
public static void main(String[] args) {
//啟動線程
new Thread(new mThread()).start();
new Thread(new mThread()).start();
//主線程中循環(huán)
for (; i < 100; i++) {
System.out.println(Thread.currentThread().getName() + "->" + i);
}
}
}
class mThread implements Runnable {
int i = 0;
@Override
public void run() {
for (; i < 100; i++) {
System.out.println(Thread.currentThread().getName() + "->" + i);
}
}
}
public class Main {
public static void main(String[] args) throws InterruptedException, ExecutionException {
Main main = new Main();
// 創(chuàng)建線程,創(chuàng)建帶返回值的Callable線程
FutureTask<Integer> task = new FutureTask<>((Callable<Integer>) () -> {
int i = 0;
for (; i < 100; i++) {
System.out.println(Thread.currentThread().getName() + "->" + i);
}
return i;
});
// 啟動線程
new Thread(task).start();
// 主線程
for (int i = 0; i < 100; i++) {
System.out.println(Thread.currentThread().getName() + "->" + i);
}
System.out.println("子線程的返回值為:"+task.get());
}
}
線程狀態(tài)圖
public class Main {
public static void main(String[] args) throws InterruptedException, ExecutionException {
// 創(chuàng)建線程,創(chuàng)建帶返回值的Callable線程
FutureTask<Integer> task = new FutureTask<>((Callable<Integer>) () -> {
int i = 0;
for (; i < 100; i++) {
System.out.println(Thread.currentThread().getName() + "->" + i);
}
return i;
});
// 創(chuàng)建線程空間
Thread thread = new Thread(task);
// 主線程
for (int i = 0; i < 100; i++) {
System.out.println(Thread.currentThread().getName() + "->" + i);
if(i == 20){
//啟動線程
thread.start();
//讓當(dāng)前線程等待
thread.join();
}
}
System.out.println("子線程的返回值為:"+task.get());
}
}
public class Main {
public static void main(String[] args) throws InterruptedException {
for(int i = 0;i <=100;i++){
System.out.println(Thread.currentThread().getName() + "->" + i);
if(i==20){
mThread thread = new mThread();
mThread thread1 = new mThread();
thread.start();
thread1.start();
thread.join();
}
}
}
}
class mThread extends Thread {
int i = 0;
@Override
public void run() {
super.run();
for (; i < 100; i++) {
System.out.println(getName() + "->" + i);
}
}
}
小結(jié):如果在主線程中創(chuàng)建兩個線程(thread ,thread 1)然后在主線程執(zhí)行thread的join方法,會讓主線程等待thread執(zhí)行完成后才會獲得調(diào)度。期間 thread和thread1會共同執(zhí)行。
public class Main {
public static void main(String[] args) throws InterruptedException {
for(int i = 0;i <=100;i++){
System.out.println(Thread.currentThread().getName() + "->" + i);
if(i == 20){
mThread thread = new mThread();
//設(shè)置為守護(hù)線程,主線程執(zhí)行完成后 不需要等待子線程執(zhí)行完就可以退出虛擬機(jī)
thread.setDaemon(true);
thread.start();}}}}
class mThread extends Thread {
int i = 0;
@Override
public void run() {
super.run();
for (; i < 800; i++) {
System.out.println(getName() + "->" + i);}}}
public class Main {
public static void main(String[] args) throws InterruptedException {
for (int i = 0; i <= 100; i++) {
System.out.println(Thread.currentThread().getName() + "->" + i);
if (i == 20) {
mThread thread = new mThread();
thread.start();
}
if(i == 50){
Thread.sleep(5000);
}
}
}
}
class mThread extends Thread {
int i = 0;
@Override
public void run() {
super.run();
for (; i < 1000; i++) {
try {sleep(1);} catch (InterruptedException e) {}
System.out.println(getName() + "->" + i);}}}
public class Main {
public static void main(String[] args) throws InterruptedException {
mThread thread = new mThread();
mThread thread1 = new mThread();
thread.setPriority(Thread.MAX_PRIORITY);
thread1.setPriority(Thread.MIN_PRIORITY);
thread.start();
thread1.start();
}
}
class mThread extends Thread {
int i = 0;
@Override
public void run() {
super.run();
for (; i < 100; i++) {
try {
sleep(1);
} catch (InterruptedException e) {
}
System.out.println(getName() + "->" + i);
// 線程讓步
if (i == 20) {
yield();
}
}
}
}
先看代碼
public class Main {
public static void main(String[] args) throws InterruptedException {
mThread thread = new mThread();
mThread thread1 = new mThread();
mThread thread2 = new mThread();
mThread thread3 = new mThread();
thread.start();
thread1.start();
thread2.start();
thread3.start();
}
}
class mThread extends Thread {
static int i = 100;
@Override
public void run() {
super.run();
try {
sleep(10);
} catch (InterruptedException e) {
}
for (; i > 0;--i) {
System.out.println(getName() + "->" + i);
}
}
}
上面代碼正常來說只會出現(xiàn)一個100 可是大多數(shù)會出現(xiàn)多個100,這顯然是不是我們想要的。
public class Main {
public static void main(String[] args) throws InterruptedException {
new mThread().start();
new mThread().start();
new mThread().start();
new mThread().start();
new mThread().start();
new mThread().start();
new mThread().start();
new mThread().start();
new mThread().start();
new mThread().start();
new mThread().start();
}
}
class mThread extends Thread {
static Integer i = 1000;
@Override
public void run() {
super.run();
try {
sleep(10);
} catch (InterruptedException e) {
}
synchronized(java.util.Calendar.getInstance()){
for (; i > 0;--i) {
System.out.println(getName() + "->" + i);
}
}
}
}
同步方法:
BlockingQuaue實(shí)現(xiàn)類和父類關(guān)系圖
線程池工具類類圖